text stringlengths 1 1.11k | source dict |
|---|---|
sensors, accelerometer, lidar
float lidarDisplacement = _lidar->getDisplacement();
_currentLidarVelocity = lidarDisplacement / time;
The second sensor is an accelerometer. I calculated acceleration and velocity using the following code:
Imu::Acceleration Imu::getAcceleration()
{
//Get quaternion
float q[4];
... | {
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"tags": "sensors, accelerometer, lidar",
"url": null
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java, authentication, rest
These look like implementation details of a Workspace class.
It might make sense for a User to have an associated Workspace,
but a User class should not have to know how a Workspace works.
This is violating good encapsulation.
If a User doesn't need to do something with a Workspace,
then he ... | {
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"tags": "java, authentication, rest",
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Since each of the 20 coats yields an actual profit of $20, the total gross profit for all 20 coats = 20*20 = 400. SUFFICIENT. The correct answer is B. _________________ Mitch Hunt Private Tutor for the GMAT and GRE GMATGuruNY@gmail.com If you find one of my posts helpful, please take a moment to click on the "UPVOTE" i... | {
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"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9830850897067341,
"lm_q1q2_score": 0.801442913752747,
"lm_q2_score": 0.8152324983301567,
"openwebmath_perplexity": 10542.00932856576,
"openwebmath_score": 0.2718382477760315,
"ta... |
ros, roslaunch, household-objects-database
Comment by ahendrix on 2012-01-17:
It looks like roslaunch is generating an error while trying to set parameters; possibly a typo in your launch file. Can you post the launch file you're using?
Your yaml file is missing an indent for the database_* parameters that would indi... | {
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"tags": "ros, roslaunch, household-objects-database",
"url": null
} |
php, sorting, quick-sort
// Snapshot
$one = $data[$x];
$two = $data[$y];
// Swapping
$data[$x] = $two;
$data[$y] = $one;
You don't need a $two variable.
$temp = $data[$x];
$data[$x] = $data[$y];
$data[$y] = ... | {
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"tags": "php, sorting, quick-sort",
"url": null
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c++, c++11, ai
Mech& parent1 = *this->mechs[ parents.random() ];
Mech& parent2 = *this->mechs[ parents.random() ];
mech = std::unique_ptr<Mech> ( new Mech (parent1, parent2) );
}
}
// ======================================================================================
// Returns the mech with ... | {
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Suppose we try to chart near the cross point, so we have a homeomorphism $f:(-\epsilon,\epsilon) \to X \subset \mathbb{R}^2$ where $X$ is the small cross. Then if we remove the single point in the center of the cross in $X$ and the corresponding point in $(-\epsilon,\epsilon)$, we get 4 connected components in the imag... | {
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"lm_q1_score": 0.9793540704659681,
"lm_q1q2_score": 0.8029658758748429,
"lm_q2_score": 0.8198933359135361,
"openwebmath_perplexity": 347.80934583123695,
"openwebmath_score": 0.8959944844245911,
"ta... |
speed-of-light, velocity
Okay, that's probably enough ;-) Since you say we don't need to consider special relativity, suppose that the universe actually obeys Galilean relativity. That's the technical term for the intuitive way to think about motion, where velocities are measured with respect to some absolute rest fra... | {
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"tags": "speed-of-light, velocity",
"url": null
} |
homework-and-exercises, newtonian-mechanics, forces, simulations, moment
Title: Multi-Force Lift Background: I am creating a 3D game. A ship has 3 thrusters that apply force up (Z+) to counteract the force of gravity (Z-).
I am trying to figure out how much thrust to apply to each thruster to get the ship to hover. I ... | {
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"tags": "homework-and-exercises, newtonian-mechanics, forces, simulations, moment",
"url"... |
organic-chemistry, reactivity, carbocation
Title: Compare reactivity of carbocations and stability of carbanions, radicals, and carbocations
For ranking the carbocations in the image above,
I thought of taking the approach that the 1st molecule, the secondary carbocation was the most reactive because it has no electr... | {
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"tags": "organic-chemistry, reactivity, carbocation",
"url": null
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# Probability of picking a biased coin
Suppose you have a bag of 100 coins of which 1 is biased with both sides as Heads. You pick a coin from the bag and toss it three times. The result of all three tosses is Heads. What is the probability that the selected coin is biased?
P(selecting a biased coin) = 1/100
P(gettin... | {
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"lm_q2_score": 0.8615382129861583,
"openwebmath_perplexity": 1232.7909998047796,
"openwebmath_score": 0.8397810459136963,
"ta... |
r, vectorization
## Update inventory
if(sum(new[,1] %in% master$book) == length(new[,1])) {
matches <- which(master$book %in% new[,1])
for(i in matches) {
if(master[i, 3] == "IN") {
master[i, 3] <- "OUT"
master[i, 4] <- as.character(new[new$book == master[i, 1], "student"])
... | {
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"tags": "r, vectorization",
"url": null
} |
analytically integrated. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. rule – This controls the Gauss-Kronrod rule used in the adaptive integration: rule=1 – 15 point ru... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9857180627184411,
"lm_q1q2_score": 0.8170999541679227,
"lm_q2_score": 0.828938806208442,
"openwebmath_perplexity": 470.40612101045696,
"openwebmath_score": 0.8388261198997... |
general-relativity, black-holes, orbital-motion
However, what happens if the observer is in an orbit around the black hole at say, the last stable orbit for a material object at a distance of $3Rs$ ? EDIT: (thanks @Ron) Being in orbit or using a rocket engine to hover near the black hole gives a result similar to the... | {
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"tags": "general-relativity, black-holes, orbital-motion",
"url": null
} |
forces, dimensional-analysis, si-units, metrology
Because $F=m a$, the units of force need to be the units of mass times the units of acceleration. In SI units, we measure mass in ${\rm kg}$ and acceleration in ${\rm m}/{\rm s^2}$, so the SI unit of force must by ${\rm kg\ m}/{\rm s^2}$.
The reason we keep track of un... | {
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"tags": "forces, dimensional-analysis, si-units, metrology",
"url": null
} |
quantum-mechanics, spectroscopy, vibrations, dipole-moment, fluorescence
In the last sentence of the paragraph following Eq. (9.135b) in Demtroder, he very briefly alludes to this issue. He says: | {
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"tags": "quantum-mechanics, spectroscopy, vibrations, dipole-moment, fluorescence",
"url"... |
quantum-mechanics, experimental-physics, quantum-entanglement, double-slit-experiment
Title: Is this double "double slit experiment" involving entanglement possible? The experiment goes as follows:
Put a particle emitter (photon, electron etc.) between a pair of double slits. The emitter launches pairs of particles th... | {
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"tags": "quantum-mechanics, experimental-physics, quantum-entanglement, double-slit-experim... |
cmake
Title: Hector Visualization Cmake error
Hi guys, I got this cmake error when building hector_visualization pacakge:
-- +++ processing catkin package: 'rqt_video_playback'
-- ==> add_subdirectory(hector_visualization/rqt_video_playback)
CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cm... | {
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homework-and-exercises, newtonian-mechanics, rotational-dynamics, friction, centripetal-force
alternative argument:
the belt does not 'grip' the pulley/there is insufficient friction to pull/push/move the belt
because of its inertia/insufficient to provide force for acceleration of (belt)-drum
My question(s) are: | {
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slam, navigation, raspberrypi, rasbperrypi, gmapping
I would say you can do the task you describe, given the right parameters (dunno how an exact amount of computational expense can be given without), but it will be a pain to set up and to work on. Would recommend going through everything needed beforehand on workstat... | {
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"url": null
} |
Quote:
q2: The next part I find uber confusing: . $2\left(\dfrac{150(150+1)}{2}\right) - 2\left(\dfrac{49(49+1)}{2}\right)$
q2a. 150 is the 150th even number, why is that important?
q2b. I have no idea where the 49 came from and why it is important?
q2c: we are dividing by 2, I understand 2 is an even number
but is... | {
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"lm_q1q2_score": 0.8303553867749534,
"lm_q2_score": 0.8723473763375643,
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"openwebmath_score": 0.9380781054496765,
"tag... |
This corresponds to the Dirichlet boundary condition. The boundary value problem has been studied for the poly-harmonic equation when the boundary of the domain consists of manifolds of different dimensions (see ). In both cases, there is heat transfer at the surface, while the surface remains at the temperature of the... | {
"domain": "muse-deutsch.de",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9924227578357059,
"lm_q1q2_score": 0.8270102868898517,
"lm_q2_score": 0.8333245891029456,
"openwebmath_perplexity": 492.8236940831988,
"openwebmath_score": 0.8473877906799316,
"t... |
matlab, impulse-response, stft, c#
return filteredDiracSequence;
} | {
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"tags": "matlab, impulse-response, stft, c#",
"url": null
} |
dark-matter, aether
Title: Could dark matter be like ether? Could dark matter (and dark energy) be proven wrong as ether was? Is it possible that we actually misunderstand how gravitation works, and that our current model is wrong? The fact that we need an invisible matter to make the laws of physics work looks like w... | {
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"tags": "dark-matter, aether",
"url": null
} |
mechanical-engineering
The axial bending fibre stress at any point on a section is calculated from stress = M y / I, where M is bending moment, y is now the distance from the neutral axis to the point where the stress is calculated and I is the second moment of area of the whole section.
If you consider any arbitrary ... | {
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"tags": "mechanical-engineering",
"url": null
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gscam, android
Title: Transmit a ROS Video topic via video stream
Hi everyone,
I receive a Video stream from my Android device using gcam, process the ros video stream with ar_toolkit and opencv amen want to stream it back.
How can I transfer a ros video topic to a Video stream? Gscam works in one direction only.
Tha... | {
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"tags": "gscam, android",
"url": null
} |
dimensional-analysis, physical-constants, faq
These three explanations are all equally mysterious, or equally reasonable, as each other. Moreover, from my experiment I have no way to test which is right, as I have no way of teleporting myself back to the past to compare my (possibly) engorged hydrogens or my (allegedl... | {
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"id": 22317,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "dimensional-analysis, physical-constants, faq",
"url": null
} |
quantum-mechanics, wavefunction, schroedinger-equation
The important thing to note is that once you fix the boundary conditions at one end of the region between $0$ and $a$, there will be only one solution to the Schrödinger equation in that region matching those conditions. That means that the boundary conditions one... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, wavefunction, schroedinger-equation",
"url": null
} |
physical-chemistry, spectroscopy
Title: Effect of nuclear spin statistics on the IR spectrum of CO2 Specifically, I am talking about $\ce{C^{16}O2}$. With a nuclear spin of zero meaning, it is a boson - it's total wavefunction must be totally symmetric. The total wavefunction is made up of an electronic, vibrational, ... | {
"domain": "chemistry.stackexchange",
"id": 7888,
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"openwebmath_score": null,
"tags": "physical-chemistry, spectroscopy",
"url": null
} |
c, hash-map, c89
Consider using integer math.
// double max_load_factor = 0.7;
// double load_factor = ((double)map->element_count) / map->buffer_size;
// if (load_factor >= max_load_factor)
// rehash(map); | {
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"tags": "c, hash-map, c89",
"url": null
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arduino, rosserial
// Start decelration with same delay as accel ended with.
new_first_step_delay = last_accel_delay;
profile.run_state = DECEL;
}
break;
case DECEL:
//digitalWrite(step_pin, !digitalRead(step_pin));
PORTB ^= _BV(PB3); // Toggles the step_pin
step_count... | {
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"tags": "arduino, rosserial",
"url": null
} |
Commented Mathematical property (CMP):
\gamma^* : (real, real) $\rightarrow$ real
Commented Mathematical property (CMP):
\gamma^* : (complex, complex) $\rightarrow$ complex
Commented Mathematical property (CMP):
\gamma^* : (symbolic, symbolic) $\rightarrow$ symbolic
Commented Mathematical property (CMP):
$\gamma^*(-n,x... | {
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... |
c++, c++11, template, template-meta-programming
template<typename Tuple, int size>
struct LOOP_BACK{
template <typename Callback>
static inline void wind_reverse(Tuple&& tuple, Callback&& callback){
callback.template call<decltype(std::get<size>(tuple)), size>( std::get<size>(tuple) );
... | {
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"tags": "c++, c++11, template, template-meta-programming",
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} |
slam, navigation, octomap, ros-kinetic, rtabmap-ros
Odom: quality=939, std dev=0.029415m. I dont understand where is the problem
Comment by Astronaut on 2018-09-10:
I edit the camera info header. Please check
Comment by matlabbe on 2018-09-10:
Indeed the stamp in image topics is null. Modify the node publishing camera... | {
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"url": null
} |
That's what I'm learning from this example, that that's a key number. And then you could ask, well, what about general examples? This was one specially chose an example with exact solution. Well, we'll see at the beginning of next time that for a convex function this is typical. This is 1 minus b is the critical quanti... | {
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"openwebmath_score": 0.7817188501358032,
"tags": null,
... |
beginner, c, tic-tac-toe, ai, curses
static bool ai_fart(int chance_to_fart) {
// Takes the fart chance and returns 1 if the AI blows the move, 0 otherwise
int roll = rand() % 100 + 1;
return roll < chance_to_fart;
}
static int pick_random_space(const char playable_spaces[NUM_SPACES]) {
// Returns a r... | {
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"tags": "beginner, c, tic-tac-toe, ai, curses",
"url": null
} |
symmetry, conformal-field-theory, field-theory, lie-algebra
Title: Conceptual question about field transformation (c.f Conformal Field Theory by Di Francesco et al, p39)
From another source, I understand the mathematical derivation that leads to eqn (2.126) in Di Francesco et al, however conceptually I do not understa... | {
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"tags": "symmetry, conformal-field-theory, field-theory, lie-algebra",
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java, beginner, game, playing-cards
//sort cards for evaluation
this.sortByRankThenSuit();
// hands are already sorted by rank and suit for royal and straight flush checks.
// check for royal flush
handResult = evaluateRoyal(rankCounter, suitCounter);
// check for strai... | {
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"openwebmath_score": null,
"tags": "java, beginner, game, playing-cards",
"url": null
} |
organic-chemistry, biochemistry, polymers, carbohydrates
Title: Why starch (amylose) and cotton (cellulose) are so different? Both amylose and cellulose have the same "monomer" structure (glucose), so what makes them look/form so differently? Your structures don't clearly show the different configurations between α- a... | {
"domain": "chemistry.stackexchange",
"id": 3695,
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"openwebmath_score": null,
"tags": "organic-chemistry, biochemistry, polymers, carbohydrates",
"url": null
} |
aqueous-solution, electronegativity, formal-charge
Title: How many sodium ions is each oxygen atom attracted to in aqueous sodium chloride? When $\ce{NaCl}$ salt is dissolved in water the $\ce{Cl-}$ and $\ce{Na+}$ ions and the polar $\ce{H2O}$ molecules are attracted to each other such that each $\ce{Na+}$ ion attract... | {
"domain": "chemistry.stackexchange",
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"openwebmath_score": null,
"tags": "aqueous-solution, electronegativity, formal-charge",
"url": null
} |
data-structures, amortized-analysis, priority-queues
If we can construct such a structure in $\mathcal{O}(n)$ time given sorted input, then we can for instance find line intersections on pre-sorted inputs with $o\left(\frac{n}{\log n}\right)$ intersections strictly faster than if we use the 'usual' priority queues. Ou... | {
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"tags": "data-structures, amortized-analysis, priority-queues",
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is a polygon having two equal sides are the.! Calculate base length z. isosceles triangle formula Deriving area of a triangular prism the is! √ ( 4a 2 – b 2 ) Next lesson the future is to provide a … Video to. Are equal to l, and also two equal angles adjacent to equal sides.! In our calculations for a triangle in whic... | {
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"lm_q2_score": 0.8244619306896955,
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"openwebmath_score": 0.6773985028266907,
"tags": nul... |
special-relativity, speed-of-light, inertial-frames, observers
the laws of physics are the same in any inertial reference frame. (On a commercial airliner, you can eat, sleep, read, or go the the rest room if the plane is at rest or moving at 600 mph.) Maxwell's equations for the interaction of electric and magnetic f... | {
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"tags": "special-relativity, speed-of-light, inertial-frames, observers",
"url": null
} |
biochemistry, amino-acids, cell-signaling, signalling
Title: Specificity of Protein Kinases in Signaling Pathways..? In most of the signaling pathways the activated receptor when activates Protein Kinase through the action of secondary messenger, then these protein kinases almost always phosphorylate on the specific S... | {
"domain": "biology.stackexchange",
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"tags": "biochemistry, amino-acids, cell-signaling, signalling",
"url": null
} |
python, performance, python-3.x
An auction company has an interactive auction board at their
salerooms, which allows buyers to place bids at any time during the
auction. Before the auction starts, the sellers place their items in
the saleroom with a unique number attached to each item (item number).
The following deta... | {
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"tags": "python, performance, python-3.x",
"url": null
} |
gravity, waves, gravitational-waves
the frequency of the gravitational waves in LIGO is actually of order of 100 Hz, so the signal may be converted to a perfectly audible sound signal (it's the chirping if the black hole signal is long, but the discovered LIGO black holes were large enough and the signal was short whi... | {
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"tags": "gravity, waves, gravitational-waves",
"url": null
} |
So we see that in this case the solution is
$$x^* = \frac{b}{2a},\;\;\; \lambda^* = 0.$$
So the constraint appears to be binding, but it really is not.
Your intuition is correct. Say you know that $$Z=X\cdot Y=0$$ You don't know if $$X=0$$ or $$Y=0$$ or both are zero. Even if you know that $$X=0$$ you have no idea i... | {
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"id": null,
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"openwebmath_score": 0.9323817491531372,
"ta... |
php, object-oriented
if (!isset($_SESSION['filesData'])) $_SESSION['filesData'] = $files->fetch();
$htmlFileContent = '';
if (isset($_GET['open'])) {
if (in_array($_GET['open'], array_column($_SESSION['filesData'], 'id'))) {
$file = $_SESSION['filesData'][array_search($_GET['open'], array_column($_SES... | {
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"openwebmath_score": null,
"tags": "php, object-oriented",
"url": null
} |
machining, metal-folding
In your case, you want to calculate the distance from the internal faces, not just for the straight part of the metal plate.
To do this, you just have to add the thickness of the material to your dimensions, i.e, your A length (from the picture above) is $(New Length) = (Old Length) + t * 2 $. | {
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"tags": "machining, metal-folding",
"url": null
} |
algorithm, c, chess, backtracking
/* We cannot go outside the board */
if ((r2 < 0) || (r2 > n - 1) || (c2 < 0) || (c2 > n - 1)) {
return 32764;
}
/* Condition to check if the path is complete */
if ((r1 == r2) && (c1 == c2)) {
return 0;
}
/* We add the point with coordinates ... | {
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"tags": "algorithm, c, chess, backtracking",
"url": null
} |
then the shortest ( perpendicular ) distance between two lines in space line1. )$ and $D_t = 0$ lines ( d ) we to... Minimum, taking partials, we shall consider two skew lines L 1 and L 2 we! Formula directly to find the shortest distance between two lines ( d ) we are shortest distance between two lines vectors the tw... | {
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"lm_q2_score": 0.8519528019683106,
"openwebmath_perplexity": 751.5349426013706,
"openwebmath_score": 0.43332409858703613,
... |
phase-transition
I would really appreciate it, if anyone could point me to the right direction. I met a paper published in PRL using the orietational order parameter and global bond_orietational order parameter. Although the structures in this paper are about the short chain alkanes, i think the definitions of the tw... | {
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"tags": "phase-transition",
"url": null
} |
\geq \delta(y) + 2$ implies there exists a $z \in X$ with $x \leadsto z \leadsto y$ and $\delta(x) > \delta(z) > \delta(y)$. \end{enumerate} Describe your space clearly and succintly explain why there cannot be a dimension function. \end{exercise} \section{Fraction fields} \label{section-fraction-fields} \begin{exercis... | {
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"lm_q2_score": 0.8128673133042217,
"openwebmath_perplexity": 113.17356744429497,
"openwebmath_score": 0.9986513257026672,
"tags"... |
python, beginner, python-3.x, programming-challenge
def get_pentagons(number_of_pentagons):
"""Assumes n is a range > 0. Generates pentagons that obey to the + - rules."""
pentagons = set(generate_pentagons(number_of_pentagons))
for pentagon1 in pentagons:
for pentagon2 in pentagons:
if... | {
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"openwebmath_score": null,
"tags": "python, beginner, python-3.x, programming-challenge",
"url": null
} |
complexity-theory, p-vs-np
Title: If everyone believes P ≠ NP, why is everyone sceptical of proof attempts for P ≠ NP? Many seem to believe that $P\ne NP$, but many also believe it to be very unlikely that this will ever be proven. Is there not some inconsistency to this? If you hold that such a proof is unlikely, the... | {
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"tags": "complexity-theory, p-vs-np",
"url": null
} |
javascript, algorithm, machine-learning
const spriteImage = new Image;
spriteImage.src = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACUAAABQCAYAAACecbxxAAACY0lEQVRoge2XPW4CMRCF5yooLeegpIw4SZp0dBF34DBIKSMOkKQJUgpyBuQUyYIZv/mx1wsGraXR4vXu+Jv3Zheg59e3cM3YbqbH+Dl8BiIiujYUEVEHtZvPwm4+C01AERF9LB+On5uAas6+uKdG+27Ovia... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, algorithm, machine-learning",
"url": null
} |
ros, urdf, moveit, ros-melodic
Resolving is actually impossible: UR robots have +- 2pi position limits on all their joints. For the elbow, this means technically it's capable of rotation twice around its origin. However, due to the way the robot is constructed, the shoulder joint will always obstruct the wrist when th... | {
"domain": "robotics.stackexchange",
"id": 35398,
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"tags": "ros, urdf, moveit, ros-melodic",
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1 saying that if is... To receive useful information and to our biconditional statement truth table policy 2 is a conclusion table below, we have biconditional! Introduction to mathematical Thinking confident about your work. both in natural language and code 4. Byju 's a statement in If-Then form use red to identify t... | {
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"lm_q1_score": 0.9324533088603709,
"lm_q1q2_score": 0.8508041102997861,
"lm_q2_score": 0.912436153333645,
"openwebmath_perplexity": 525.5291997350896,
"openwebmath_score": 0.49255892634391785,
"ta... |
image-processing, fft, fourier-transform, frequency-domain
Title: Which information do we get from magnitude and phase spectrum? I am learning image processing. I want to ask very basic question related to FFT topic
Which information do we actually get from "phase spectrum" and "magnitude spectrum" about an image? Yo... | {
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"tags": "image-processing, fft, fourier-transform, frequency-domain",
"url": null
} |
python, python-3.x, formatting, bitwise
def __delitem__(self, key: str) -> None:
del self._store[self._trans(key)]
def __contains__(self, key: str) -> bool:
return self._trans(key) in self._store
def __iter__(self):
return iter(self._store)
def __len__(self) -> int:
... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, formatting, bitwise",
"url": null
} |
neural-networks, tensorflow
Title: How can I find what does an specific neuron do in neural network? How can I know what each neuron does in NN?
Consider the Playground from Tensorflow, there are some hidden layers with some neurons in each. Each of them shows a line(horizontal or vertical or ...). Where these shapes ... | {
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"tags": "neural-networks, tensorflow",
"url": null
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• Now by comparing coefficients of $x^{3}$ we see that \begin{equation*} -b=x_{1}+x_{2}+x_{3}+x_{4}=-4, \end{equation*} which is just Vieta's formula for the sum of the roots of the polynomial $q (x)$. The original equation $p(x)=0$ has thus five roots: $x_0=4$ and the four roots $x_{1},x_{2},x_{3},x_{4}$ of $q(x)$. We... | {
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"openwebmath_score": 0.9998109936714172,
"ta... |
Kudos [?]: 1854 [0], given: 397
The number of distinct factors of 32 [#permalink] 30 Aug 2018, 16:39
Expert's post
00:00
Question Stats:
25% (00:34) correct 75% (00:29) wrong based on 16 sessions
Quantity A Quantity B The number of distinct factors of 32 The number of distinct factors of 20
A)The quantity in Colu... | {
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"lm_q2_score": 0.8289388104343892,
"openwebmath_perplexity": 4155.798583500879,
"openwebmath_score": 0.2904089093208313,
"tags"... |
plasma-physics, fusion
It's called beta.
First off, you promote bremsstrahlung to a unique position as a loss mechanism. Conduction and other radiative effects are more important in energy terms, and these generally increase with mass. This is why so much of modern design is devoted to various scrape-off systems and d... | {
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"tags": "plasma-physics, fusion",
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As soon as we select 9 points (or more) it is always possible to find a set of 4 which does have a centroid which is a lattice point.
It is possible to choose 12 of those 16 points such that the selection of any 4 have the property that the centroid is not a lattice point, so long as you don't require that the 12 poin... | {
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"lm_q1q2_score": 0.8626136835764684,
"lm_q2_score": 0.8723473614033683,
"openwebmath_perplexity": 207.49146620839028,
"openwebmath_score": 0.8303226828575134,
"tags": nu... |
javascript, security, authentication, typescript, angular-2+
public login(email: string, password: string):Observable<User> {
return this.http.post<User>(loginUrl, { email, password }, {withCredentials: true})
.pipe(
tap(user => {
// login successful if there's a jwt token in the re... | {
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"openwebmath_score": null,
"tags": "javascript, security, authentication, typescript, angular-2+",
"url": null
} |
# 19.5. Exercises¶
1. Let $$X_i$$, $$i = 1,2$$ be independent random variables such that $$X_i$$ has the exponential $$(\lambda_i)$$ distribution. Suppose $$\lambda_1 \ne \lambda_2$$.
(a) Use the convolution formula to find the density of the sum $$S = X_1 + X_2$$.
(b) Show by algebra that the expression you got for... | {
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"openwebmath_perplexity": 115.78993032582198,
"openwebmath_score": 0.9698046445846558,
"tags": n... |
What do we do now?
The answer is that we need a different proof technique. The proofs we have written
so far are what are called direct proofs: to prove p q you assume p is true and prove that the truth of q follows. Sometimes, when a direct proof of p q fails, an indirect proof will work. Recall that the contrapositi... | {
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"lm_q2_score": 0.8152324960856175,
"openwebmath_perplexity": 141.48556756648597,
"openwebmath_score": 0.7485904693603516,
"tags"... |
c#, extension-methods
private SmtpServerAddress smtpServer;
public SmtpClient(SmtpServerAddress smtpServer)
{
smtpServer.AssignToOrThrow(ref this.smtpServer, "smtpServer");
}
as opposed to
public SmtpClient(SmtpServerAddress smtpServer)
{
if(smtpServer == null)
throw new ArgumentNullException("smtpSe... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "c#, extension-methods",
"url": null
} |
game, powershell
A sample success screen
# # # # P
# # # # #
# D # # #
# # # # #
# # # # #
You found the treasure in 14 move(s). I like it, I learnt a few things about objects from this. I also really liked the board size can be easily changed.
Immediate Collision
When playing I noticed the Dragon was allowed to start... | {
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"openwebmath_score": null,
"tags": "game, powershell",
"url": null
} |
measurements
The marks on the Vernier scale correspond to 0.00, 0.05, 0.10 … 1.00 mm. For example, when the mark labeled "2" lines up with a tick mark on the main scale, you add 0.20mm to the main scale reading.
It doesn't matter which tick mark on the main scale the "2" lines up with. Obviously the "2" mark will lin... | {
"domain": "engineering.stackexchange",
"id": 2513,
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"openwebmath_score": null,
"tags": "measurements",
"url": null
} |
multiplication... Example: [ ] is called the multiplicative inverse 10 * 10 I ) >... By 1 dealing with matrix computation, it is multiplied on the matrix. Of columns in the first article of this series, we can perform... 3 = 100 010 001 identity matrix Page 1 of 3 Algebra > >! Are 1 whole matrix multiplication another ... | {
"domain": "stampdealersassociationofgeorgia.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9626731169394882,
"lm_q1q2_score": 0.8257502969922134,
"lm_q2_score": 0.8577681068080749,
"openwebmath_perplexity": 528.1671848794363,
"openwebmath_score": 0.8... |
ruby, markov-chain
#Parsing the file
syllables = Hash.new false
start = Hash.new 0
begin
IO.foreach(file) { |line|
name, start_prob, end_prob, links = line.split LINE_PART_DELIMITER
error 2, "`#{line}`" if links.nil? || end_prob.nil? || start_prob.nil? || name.nil?
links = links.split(LINK_DELIMITER).inj... | {
"domain": "codereview.stackexchange",
"id": 13791,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ruby, markov-chain",
"url": null
} |
javascript, angular.js, asynchronous
$scope.loadAll = function () {
Category.query(function (result) {
$scope.categories = result;
});
WatchableTeaser.getTeaserToWatch().then(function (teaser) {
$scope.teaser = teaser;
});
};
$scope.loadAll();
$scop... | {
"domain": "codereview.stackexchange",
"id": 17311,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, angular.js, asynchronous",
"url": null
} |
mechanical-engineering, technical-drawing, tolerance, drawings
For inspection purposes it is also much easier to have the distance from 'A' explicitly stated as this is the reference surface for the feature parallelism. I imagine surface 'A' would be on an inspection plate, a CMM or indicator would be set to measure t... | {
"domain": "engineering.stackexchange",
"id": 3435,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mechanical-engineering, technical-drawing, tolerance, drawings",
"url": null
... |
mathematics things are connected mathematics Relations 2 Problems Relations. Bronze badges are said to be symmetric lines in S are parallel if and only if they equal! For all x, y, z a, if xRy and yRz, then xRz ˘describes... Binary relation are connected definition of an equivalence relation if a is called equivalence!... | {
"domain": "northernarizonanews.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9481545304202039,
"lm_q1q2_score": 0.8096412470572303,
"lm_q2_score": 0.8539127548105611,
"openwebmath_perplexity": 776.0495475125625,
"openwebmath_score": 0.63241159915924... |
python, performance, pandas
data['ID'] = ID
data['dt'] = randint(0, sys.maxsize, len(data)).astype('M8[ns]')
data.loc[choice([True, False], len(data), [0.05, 0.95]), 'dt'] = None
data = data.apply(permutation)
# Until here the data was only prepared to be similar to my actual data.
# The following command should be... | {
"domain": "codereview.stackexchange",
"id": 30535,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, pandas",
"url": null
} |
• If $x \in X$ for every $X \in \mathcal C$ and $A$ is an element whatever of $\mathcal C$, obviously $x \in A$. As you said, $A$ is needed by Specification ($\mathcal C$ is a collection, and thus not necessarily a set). – Mauro ALLEGRANZA Nov 14 '17 at 16:51
• @MauroALLEGRANZA, can you elaborate the difference between... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9664104962847373,
"lm_q1q2_score": 0.8307880717682873,
"lm_q2_score": 0.8596637505099168,
"openwebmath_perplexity": 195.11649163259574,
"openwebmath_score": 0.8476527333259583,
"ta... |
condensed-matter, feynman-diagrams, interactions, greens-functions
Title: What happens in the Hartree and Fock diagrams? I am trying to understand the Hartree and Fock diagram shown in the picture.
To understand it a assume there is an electron entering and leaving at the tail of the tadpole (Hartree diagram) and an e... | {
"domain": "physics.stackexchange",
"id": 55384,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "condensed-matter, feynman-diagrams, interactions, greens-functions",
"url": null... |
co.combinatorics, puzzles
Title: Are there local maxima in the number of moves required to solve a Rubik's Cube? Peter Shor brought up an interesting point in relation to an attempt to answer an earlier question on the complexity of solving the $n \times n \times n$ Rubiks cube. I had posted a rather naive attempt to ... | {
"domain": "cstheory.stackexchange",
"id": 580,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "co.combinatorics, puzzles",
"url": null
} |
particle-physics
Title: What are secondary vertices and what is Vertex vs Jet What is the difference between a vertex and a jet? Are they the same?
Are secondary vertices sort of jets that are part of a larger jet? Jets are a terminology used descriptively to start with, on collectively seen measured tracks of particl... | {
"domain": "physics.stackexchange",
"id": 77752,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "particle-physics",
"url": null
} |
quantum-field-theory, particle-physics, standard-model, chirality, weak-interaction
Now once you take the massless limit the Weyl fermions are traveling at the speed of light you can no longer boost to a frame that switches the helicity. I think its best to think of a fermion mass term as an interaction in this case a... | {
"domain": "physics.stackexchange",
"id": 76176,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, particle-physics, standard-model, chirality, weak-interactio... |
functional-programming, matrix, statistics, r
Weights for the interactions of each dataset (4 to avoid to many combinations):
nweight <- 4
weight <- seq(from = 0, to = 1, length.out = nweight)
Initiate the list that will contain the matrices
C_list <- vector("list", nweight)
cweight <- as.character(weight)
names(C_li... | {
"domain": "codereview.stackexchange",
"id": 31920,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "functional-programming, matrix, statistics, r",
"url": null
} |
neural-network, keras, feature-selection, feature-engineering, correlation
Alternatively, stick with importance scores of Tree-based models (such as Random
Forests), or with good old statistical analysis. Shapley value regressions are a famous example. | {
"domain": "datascience.stackexchange",
"id": 11927,
"lm_label": null,
"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "neural-network, keras, feature-selection, feature-engineering, correlation",
... |
dx v Now, integrating both sides with respect to x results in Z u dv dx dx = uv − Z du dx vdx This gives us a rule for integration, called INTEGRATION BY PARTS, that The quotient rule is a method of finding the integration of a function that is the quotient of two other functions for which derivatives exist. This formu... | {
"domain": "hospedagemdesites.ws",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9838471670723236,
"lm_q1q2_score": 0.8177177248372116,
"lm_q2_score": 0.8311430394931456,
"openwebmath_perplexity": 442.99330691478656,
"openwebmath_score": 0.9383604526519775,
... |
ros
Title: RVIZ cannot be initialized
At the very beginning, the PC cannot be started, after remove the memory and plug back to the slot, the PC could be started. When I run some code, the rviz cannot be started, then I check the RVIZ alone, but it failed again. Corresponding terminal shows as the following:
rct@rct-... | {
"domain": "robotics.stackexchange",
"id": 10407,
"lm_label": null,
"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros",
"url": null
} |
reinforcement-learning, markov-decision-process, monte-carlo-methods, model-based-methods
$$R_1=[3+2−4+4−3, 2−4+4−3, 4−3]= [2, −1, 1]$$
$$R_2=[−2+3−3, 3−3]=[−2, 0]$$
$$R_1+R_2=[2,−1, 1,−2, 0]$$
which, when averaged over 5 visits, is 0 and the correct answer, but I would like if you could confirm if the methodology is ... | {
"domain": "ai.stackexchange",
"id": 2495,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reinforcement-learning, markov-decision-process, monte-carlo-methods, model-based-method... |
astronomy, astrophysics, stars
Title: What physical interactions actually make single stars leave their binary companions at formation? From an interesting ScienceDaily article, I read this | {
"domain": "physics.stackexchange",
"id": 3017,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "astronomy, astrophysics, stars",
"url": null
} |
arrangements of $n$ spoons and forks, where $[n\text{ is odd}]$ is an Iverson bracket.
Added: In the updated version of the question there is one arrangement with no forks. Suppose now that the first fork is the $k$-th utensil from the end of the row, where $1\le k\le n$. If $k$ is even, there are $k/2$ guaranteed for... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9763105266327962,
"lm_q1q2_score": 0.8661871812112399,
"lm_q2_score": 0.8872045907347108,
"openwebmath_perplexity": 610.6038988256906,
"openwebmath_score": 0.7812507152557373,
"tag... |
control, pid, differential-drive
$\omega = R_\text{wheel speed}-L_\text{wheel speed}$
Next, for combining the range sensor inputs we have a number of different options to choose from. Which one is best for a given situation will depend a lot on the geometry of the robot and where the sensors are pointing. For now, let... | {
"domain": "robotics.stackexchange",
"id": 412,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "control, pid, differential-drive",
"url": null
} |
classical-mechanics, lagrangian-formalism, constrained-dynamics
I have seen some of the posts regarding virtual displacements but I have a question that doesn't seem to be answered by other posts. Suppose we have an inclined plane and a particle is sliding on the frictionless surface of the plane, so there is a normal... | {
"domain": "physics.stackexchange",
"id": 42795,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "classical-mechanics, lagrangian-formalism, constrained-dynamics",
"url": null
} |
ros, ros2, colcon, setup.py, ros-bouncy
def main(args=None):
rclpy.init(args=args)
test_publisher = TestPulisher()
rclpy.spin(test_publisher)
if __name__ == '__main__':
main()
Error message when running my_module:
Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-pa... | {
"domain": "robotics.stackexchange",
"id": 32021,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, ros2, colcon, setup.py, ros-bouncy",
"url": null
} |
soft-question
The best way to get a position if you are really limited on publications is as a postdoc on a grant supported by someone you have worked with before, or who knows your work well. These people are more likely to hire you on potential or other factors, rather than on your publication record. The scope for ... | {
"domain": "physics.stackexchange",
"id": 3347,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "soft-question",
"url": null
} |
java, beginner, android, sqlite, quiz
// Second Question
String androgensQuestion2 = MainActivity.getContext().getResources().getString(R.string.androgens_Question2);
String androgensQuestion2a = MainActivity.getContext().getResources().getString(R.string.androgens_Question2a);
String androgensQuestion2b =... | {
"domain": "codereview.stackexchange",
"id": 22769,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, beginner, android, sqlite, quiz",
"url": null
} |
assembly, compiler
start:
jmp howManyRowsString$
howManyRowsString:
db "How many rows of Pascal's triangle do you want to be printed?",10,0 ;10 is '\n', and 0 is '\0'.
howManyRowsString$:
pushStringToTheSystemStack howManyRowsString
call [printf] ;printf(howManyRowsString)
jmp theFloatS... | {
"domain": "codereview.stackexchange",
"id": 38193,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "assembly, compiler",
"url": null
} |
using the Excel Normdist function, as follows:. Normal density: dnorm(x, mean=0, sd=1) By default it is the standard normal density. The graph of the density function is shown next. The area under the probability density function f(x), over all values of the random variables X, is equal to one 3. Available in Excel wit... | {
"domain": "safoo.de",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9835969708496457,
"lm_q1q2_score": 0.8280171507653216,
"lm_q2_score": 0.8418256412990658,
"openwebmath_perplexity": 326.11147646681223,
"openwebmath_score": 0.8616211414337158,
"tags": null... |
python, performance, python-2.x, iterator, iteration
classStart = (cltimeS.split(":"))
del classStart[-1]
starttime = ( str(classStart[0]) + str(classStart[1]) )
classEnd = (cltimeF.split(":"))
del classEnd[-1]
... | {
"domain": "codereview.stackexchange",
"id": 26995,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, python-2.x, iterator, iteration",
"url": null
} |
android-core, rosjava, android
Title: Could not find group:ros.rosjava_zeroconf
Trying out the new apps in android_core tutorial fails with following message. Does anyone have a clue?
$ ./gradlew debug --stacktrace
:android_app_chooser:deployLibs
FAILURE: Build failed with an exception.
* What went wrong:
Could not... | {
"domain": "robotics.stackexchange",
"id": 13519,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "android-core, rosjava, android",
"url": null
} |
## Alternative approach
If you represent the iterates $$x_k$$ as fractions $$p_k/q_k$$, then you have some freedom in assigning the iteration of numerator and denominator in $$\frac{p_{k+1}}{q_{k+1}}=\frac{aq_k}{p_k+q_k}.$$ Choose to make the separate iterations linear, $$\pmatrix{p_{k+1}\\q_{k+1}} = \pmatrix{0&a\\1&1... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9843363545048393,
"lm_q1q2_score": 0.8159546026108112,
"lm_q2_score": 0.828938806208442,
"openwebmath_perplexity": 959.616102300317,
"openwebmath_score": 0.9999898672103882,
"tags"... |
ros, rviz, topic
If someone as an idea it will be really great full :)
EDIT :
Ok I didn't know I will edit this one now.
The thing is I can not subscribe to any topic for obstacle ,the different grid and I do not know why. The topic available are same that I post before.
rosnode list :
user@IBX0020-2014:~$ rosnode li... | {
"domain": "robotics.stackexchange",
"id": 22939,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, rviz, topic",
"url": null
} |
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