text stringlengths 1 1.11k | source dict |
|---|---|
digital-communications, modulation, demodulation, baseband
Now let me explain what are the base-band and pass-band, first be aware that the main difference between them is when using baseband, it means we transmit the signal as it is without doing modulation, but when using pass-band, we start doing modulation and shi... | {
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"tags": "digital-communications, modulation, demodulation, baseband",
"url": null
} |
python, performance
self.tile_list[
pos[0] + pos[1] * self.size[1]
] = value
def move(self, pos):
"""Set tile at pos to the letter of the player whose turn it currently
is. Pos is a tuple containing an x/y value. Return False if tile is
already taken, return True if t... | {
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"tags": "python, performance",
"url": null
} |
c#
Is it possible to extract this ternary operator in independent statement.
Thanks!
Cheers Another alternative to the switch statement suggested by jakubiszon is a dictionary:
var statusMap = new Dictionary<ProductStatus, string>
{
[ProductStatus.Sold] = "Delivered",
[ProductStatus.OnHold] ... | {
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} |
condensed-matter, ising-model, many-body
As stated in the question, after the Jordan-Wigner transformation, the original Hilbert space of the periodic spin chain is mapped into two sectors of Fock space with $P=\pm 1$ (even/odd) respectively. The $c$-fermion vacuum states $|0\rangle_c$ in both sectors have $P_0=1$ and... | {
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"tags": "condensed-matter, ising-model, many-body",
"url": null
} |
ros2, ros-crystal
<exec_depend>rosidl_default_runtime</exec_depend>
<test_depend>ament_lint_auto</test_depend>
<test_depend>ament_lint_common</test_depend>
<member_of_group>rosidl_interface_packages</member_of_group>
<export>
<build_type>ament_cmake</build_type>
</export>
</package>
And msg_constants... | {
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"tags": "ros2, ros-crystal",
"url": null
} |
ros, frame, transform
Title: add a new frame to the tree
Hi,
I use the following commands to build add a frame to a tree. The rviz shows there is a frame, but when I try
obj_frame_pose_stamped = change_pose_stamped_frame(self.tf_listener, pose_stamped, "base_link"),
the error is:tf.Exception: Frame id /grasp_frame do... | {
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"tags": "ros, frame, transform",
"url": null
} |
electrons, solid-state-physics, semiconductor-physics, electronic-band-theory
Thanks to Jon Custer's comments in this question, most of my confusion regarding this matter has been clarified. However, there is still one aspect of this textbook's explanation that I would like clarified.
If I'm understanding this correct... | {
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"tags": "electrons, solid-state-physics, semiconductor-physics, electronic-band-theory",
... |
is to come as close as possible to the optimum value in a reasonable amount of time which is at the most polynomial time. Two Algorithms for Vertex Cover Problem: Not so good Greedy Algorithm, and simple 2-factor Approximation algorithm. Design Techniques for Approximation Algorithms 3. 5-approximation algorithm for th... | {
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"lm_q1_score": 0.9869795118010989,
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"lm_q2_score": 0.8418256492357358,
"openwebmath_perplexity": 972.1502875536687,
"openwebmath_score": 0.79016977548599... |
electromagnetism, magnetic-fields, vector-fields
This is all that is said about it, taken from the 1st edition. Note the units aren't SI, hence the $c$.
The issue I have with this is the following. The curl of $\mathbf{J}$ divided by $|\mathbf{x}-\mathbf{x'}|$ can be expanded as:
$$ \nabla \times \left ( \frac{\mathb... | {
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"tags": "electromagnetism, magnetic-fields, vector-fields",
"url": null
} |
c, c99
Our Battlestarcraft Algorithmica ship is being chased through space by persistent robots called Pylons! We have just teleported to a new galaxy to try to shake them off of our tail, and we want to stay here for as long as possible so we can buy time to plan our next move... but we do not want to get caught!
Thi... | {
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"tags": "c, c99",
"url": null
} |
thermodynamics, evaporation
Will the water evaporate before its temperature reaches to $T_{surr}$?
If the water evaporates, then required heat for it comes from where?
If the water doesn’t evaporate, then why?
Thanks in advance. Some water will evaporate, and the heat required for this comes from the water itself. The... | {
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"tags": "thermodynamics, evaporation",
"url": null
} |
gauge-theory, interactions, yang-mills, gluons
Once we add in quarks, then all bets are off: quark pair production will happen at a fast rate, leading to more and more interactions. I assume this is why we don't see unconfined gluons in real life. But am I correct that they do exist in YM, or am I making a basic error... | {
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"tags": "gauge-theory, interactions, yang-mills, gluons",
"url": null
} |
error-correction, fault-tolerance, magic-states
What I don't understand
Here, I assumed that steps 1. and 3. are perfect. In practice, they will not be. What we need is to be sure that the probability that something goes wrong there has a probability $O(p^2)$. What ensures me this? | {
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"tags": "error-correction, fault-tolerance, magic-states",
"url": null
} |
orbital-elements
where t is the epoch and T is the Time since Perihelion. Through this website, I found the values for the variables in that equation and tried finding the Mean Anomaly for a few planets. But it doesn't seem to match with the values given on the previous website (this one).
So my main question is: Can ... | {
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of the function is the union of all these smaller domains. Fundamental Theorems on Limits. In this case the half-diagrams are no longer time-ordered, but retarded. In other words, the value of the limit equals the value of the function. LIMIT WORKSHEET #3. Here and in the remainder of this tutorial we. This is our firs... | {
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"lm_q2_score": 0.8244619177503205,
"openwebmath_perplexity": 484.8709305420036,
"openwebmath_score": 0.877098917961120... |
c#, object-oriented, game, console, sliding-tile-puzzle
for (int i = 0; i < flattedList.Count - 1; i++) {
for (int j = i + 1; j < flattedList.Count; j++)
{
if (flattedList[i] > flattedList[j])
{
inv_count++;
... | {
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"tags": "c#, object-oriented, game, console, sliding-tile-puzzle",
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} |
ros2, urdf, xacro
Title: How to convert xacro file to urdf at ROS2? I have a .xacro file exported from Fusion360. I want to convert it to .urdf to use at moveit2. How can I do this? I was able to convert it with,
xacro model.xacro > model.urdf
However what you must do is open the xacro file and copy and past the nece... | {
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"tags": "ros2, urdf, xacro",
"url": null
} |
general-relativity, gravity, dark-matter, modified-gravity
Gravitational Red-Shift of Light- In 1959 the Pound-Rebka experiment observed a relative red-shift of light between two different light sources, due to gravitational effects of the Earth. | {
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} |
c++, c++11, design-patterns
As for how your list of handlers should be defined: almost certainly you should just use a list of handlers (i.e. std::list<Handler> — or std::list<std::weak_ptr<Handler>> if you really want to keep your original design's ability to have handlers drop out of the list at random).
I don't thi... | {
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• In addition to the error in the first problem that @JMoravitz spotted, there is an error in your calculation of the probability that a five-card hand has neither an ace nor a queen but contains at least one king. You should have $\binom{44}{5} - \binom{\color{red}{40}}{5}$ in the numerator since a hand that contains ... | {
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"lm_q2_score": 0.8670357649558006,
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"openwebmath_score": 0.6587808728218079,
"tags... |
and b is the intercept. Python interpreters are offered for a great deal of operating systems. The fitted curve plot is through using the high quality python plot package matplotlib. Examples of both methods. Today we are going to learn about the Polynomial regression of Machine Learning in Python. In this post, we'll ... | {
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"lm_q2_score": 0.8267117898012104,
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"openwebmath_score": 0.3821280598640442,
"ta... |
ros, c++, graph
Originally posted by tfoote with karma: 58457 on 2011-12-08
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by alfa_80 on 2011-12-13:
@tfoote: Thanks for the clarification.
Comment by tfoote on 2011-12-10:
It's relatively easy to publish what you want to plot to v... | {
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Is this correct? I don't have the answer. I suspect this can be derived from a probability distribution. If my suspicions are correct, which probability distribution?
2. Jul 6, 2014
### Fredrik
Staff Emeritus
Isn't this just the probability that none of the first five is a 6?
3. Jul 6, 2014
### Mogarrr
Right you ... | {
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"openwebmath_score": 0.7986534237861633,
... |
c++, performance, machine-learning
Most egregiously, there is not a single letter documenting the functions’ interfaces, preconditions, or usage. I can deduce from the code that you are not expecting empty vectors (otherwise, you’d be dividing by zero when you do store / size). But the only way I could spot that is by... | {
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"tags": "c++, performance, machine-learning",
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} |
ruby, ruby-on-rails, comparative-review, authentication, session
Whenever you repeat yourself in a class, whenever you use copy paste from another class, is most oftentimes an indication that you could abstract the code to a set of smaller functions / objects.
With regards to the tool reporting a high ABC rank: those... | {
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"tags": "ruby, ruby-on-rails, comparative-review, authentication, session",
"url": nul... |
kinect, openni, openi-tracker, openni-launch
Originally posted by Mobile_robot on ROS Answers with karma: 264 on 2014-06-23
Post score: 0
I don't know if you can run the openni_tracker on 2 kinects, but in this case I think the problem is that the second node you run has the same name as the first, which is then stop... | {
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} |
c++, csv
template <class T_ITERABLE, class T_RETVAL>
class CSVIterator {
public:
CSVIterator(T_ITERABLE& obj) : my_obj(obj), location(0) { /* blank */ }
T_RETVAL GetFirst() { return my_obj[0]; }
T_RETVAL GetLast() { return my_obj[my_obj.Size() - 1]; }
T_RETVAL At(unsigned int ... | {
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reinforcement-learning, markov-decision-process, pomdp, self-play, observation-spaces
In many games though, there is the concept of "perfect play", of forcing the best possible result from the current game state. Planning/search routines using minimax approaches can theoretically solve these games, and reinforcement l... | {
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... |
The data has fraction $p$ of (non-obvious) wrong measurements. The distribution of "good" and "bad" $y_i$ are the same.
Our goal is to recover $\beta^\mathrm{true} \in {\bf R}^n$ from the measurements $y\in {\bf R}^m$. We compare three approaches: standard regression, Huber regression, and "prescient" regression, wher... | {
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"tags": null... |
navigation, ros-kinetic, costmap-2d
Originally posted by teonik with karma: 48 on 2018-02-09
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by David Lu on 2018-02-20:
The other option you could pursue is to write your own custom layer and use it as a plugin. | {
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ros, gazebo, ros-melodic, roscore
Title: "roscore" is not initializing - ROS MELODIC
I have installed ROS_MELODIC in my Ubuntu 18.04.1 LTS machine.
When I started the ros master with roscore, I got an exception as quoted.
... logging to /home/revan/.ros/log/199d6f5c-b3e9-11e8-b3b6-54a0507ac74b/roslaunch-revaapriyan-6... | {
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"tags": "ros, gazebo, ros-melodic, roscore",
"url": null
} |
quantum-mechanics, quantum-information, quantum-computer
I was wondering the meaning of this word, and I googled, then one source came;
logic gate (plural logic gates)
a physical device, typically electronic, which computes a Boolean logical output (0 or 1) from Boolean input or inputs according to the rules of some ... | {
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special-relativity, visible-light
$$
\cos\theta' = \frac{\cos\theta - v/c}{1 - (v/c)\cos\theta},
$$
$$
\sin\theta' = \frac{\sin\theta/\gamma}{1 - (v/c)\cos\theta}.
$$
This formula for $\cos\theta'$ corresponds with the formula given in wikipedia. | {
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ros, navigation, sbpl-lattice-planner, sbpl, move-base
So the simple solution is to change this 0.6545 to 0.000. Take note that for all other primitives, the end pose will not be pushed into the plan as well, but because the last intermediate pose is close to the end pose, you won't notice the difference (1/9th of the... | {
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"tags": "ros, navigation, sbpl-lattice-planner, sbpl, move-base",
"url": null
} |
friction, gazebo-9
Title: Friction insufficient in grasping simulation
Update 2
Following some advice below I changed the ROS controller from EffortJointInterface to PositionJointInterface and this seems to be a step in the right direction, the object moves vertically a little bit, but it still does not grasp properl... | {
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general-relativity, astrophysics
The paper https://arxiv.org/abs/2007.00082 you cited focuses on the FLRW metric, since it discuses the RMOND's cosmological consequences.
If you are interest in the modified Schwarzschild metric formula, you can refer to equation (16) of another paper by the same author (Tom Złosnik): ... | {
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pathology
Cancer is caused by random genetic mutations in the cells of our body. The mutations can be caused by many factors such as ionizing radiation, smoking, chemical toxins etc.
Diseases such as stroke or heart attack are caused by blood clots blocking the blood flow to essential organs.
Autoimmune diseases are c... | {
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(phasor notation), exponential, or polar coordinates (magnitude and angle). To convert from polar form to rectangular form, first evaluate the trigonometric functions. Multiplying and dividing complex numbers in polar form. The standard form, a+bi, is also called the rectangular form of a complex number. Click to share... | {
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"openwebmath_score": 0.7707651257514954,
"tags": null... |
as vertical integration of feature classes there. As a union of members of B of subsets of X is a valid topology on n…! Same asτif the following result makes it more clear as to basis for topology example a basis a! | {
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"openwebmath_score": 0.7190268039703369,
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unit-testing, vba, library
TestMethod
The Run sub..... wow man. That's error handling done right. It's a very clean routine. I like it. I know you don't like the flag, and truthfully, neither do I, but I don't see how it could be done differently.
I see what you're talking about with the EvaluateResults function. Unf... | {
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} |
special-relativity, speed-of-light, spacetime
Title: If something is not moving in space, is it moving on the time axis at the speed of light? I heard this theory yesterday:
If something is not moving in space, then it is moving on the time axis at the speed of light.
I realize that in essence there is no object which... | {
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"tags": "special-relativity, speed-of-light, spacetime",
"url": null
} |
inverse-kinematics, imu, irobot-create, forward-kinematics, robot-model
Title: Estimation of pitch, roll, yaw angles: synthesis of an observer or IMU? Dear Robotics Specialists, I want to contact you for advice.
I am developing a control system for complex parallel mechanisms like what I presented in this thread.
Form... | {
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"tags": "inverse-kinematics, imu, irobot-create, forward-kinematics, robot-model",
"url":... |
computability, enumeration
Title: Why does my answer sheet say the set of computable functions is uncountable? I'm trying to understand why I can't find room for the set of computable functions in the hotel of the Hilbert's Hotel Paradox.
I was thinking that, because Gödel numbering, I could consider the set of comput... | {
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since \pi is irrational. I think the Fourier series uses specific frequencies to form the signal. You can't necessarily put a frequency ... 3 Dimension in mathematics is defined as the number of independent components of a structure (with some generalizations, like fractal dimensions). Now which number of dimensions yo... | {
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Neither of them determine the correct result. I believe I'm missing a crucial point, I would prefer hints or suggestions rather than a complete answer if possible.
-
I believe that you meant to write $$\binom42/\binom63\;.$$ – Brian M. Scott Nov 19 '12 at 5:47
@BrianM.Scott yes indeed! fixed, thank-you. – Switzy Nov... | {
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ros, navigation, odometry, navsat-transform-node, robot-localization
sensor_msgs/Imu message:
---
header:
seq: 11138
stamp:
secs: 1530531940
nsecs: 302707371
frame_id: body_FLU
orientation:
x: -0.224501576947
y: -0.140455550098
z: 0.889119624209
... | {
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"tags": "ros, navigation, odometry, navsat-transform-node, robot-localization",
"url": n... |
moveit, joint-state-publisher
<include file="$(find my_pkg)/launch/move_group.launch">
<arg name="publish_monitored_planning_scene" value="true" />
</include>
<!-- By default, we are not in debug mode -->
<arg name="debug" default="false" />
<include file="$(find my_pkg)/launch/moveit_rviz.launch">
<!... | {
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"tags": "moveit, joint-state-publisher",
"url": null
} |
python, python-3.x, console, curses
Use libvirt API
Based on @MichaelHampton's advice I moved the code to the libvirt API, basing off of the changes made in the answer by @Peilonrayz.
The crucial difference is to make a connection to libvirt in __main__ (otherwise we'd run into problems with interactive authentication... | {
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"tags": "python, python-3.x, console, curses",
"url": null
} |
electrostatics, capacitance, gauss-law
Thus, when you put two opposite charged plates to form a capacitor, the fields between the plates will be directed the same way and this means that you have a non zero electric field in the inside, while the fields outside the plates will cancel out and you have a null electric f... | {
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"tags": "electrostatics, capacitance, gauss-law",
"url": null
} |
c++, strings, c++11, unicode
void String::Shrink()
{
_vctr.Shrink();
}
String& String::Append(CStr value)
{
ASSERT_PARAMETER(value);
*this += value;
return *this;
}
String& String::Append(String const & value)
{
*this += value;
return *this;... | {
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"tags": "c++, strings, c++11, unicode",
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} |
bacteriology
Irish physicist and science popularizer John Tyndall was superintendent at the Royal Institution in London and had published scientific works on heat, light and sound, as well as popular books. His ideas on germs became controversial in January 1870 after giving a lecture to the Royal Institution entitled... | {
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"tags": "bacteriology",
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rosserial-arduino
I currently have a sketch that takes the "cmd_vel" topic and maps a value (-1 to 1) to (0 to 180) from "linear.x" to move a servo using a node that publishes from the keyboard.
I need some direction, because I want to use a Twist topic for both autonomous movement and remote teleop (rc transmitter) i... | {
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"tags": "rosserial-arduino",
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} |
vba, excel, memory-management, memory-optimization
VBA will helpfully initialize all variables to their 'initialized' state when you Dim them, so it's a bit redundant
I'm torn on this one, it's programmer preference
Multi-line statements (:)
They do make for more compact code, but they make the code less readable.
I... | {
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"tags": "vba, excel, memory-management, memory-optimization",
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python
When it comes to creating the input prompts, you may want to look into Python format strings. This is a subtype of strings that comes in handy whenever you want to create a string that embeds the value of a variable (or for that matter, the value of any evaluation). You create a format string are like any other... | {
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java, object-oriented, game, android
}
public void draw(Canvas canvas, Paint paint, float left, float top) {
canvas.drawBitmap(bitmapRover, left, top, paint);
}
//if tank jumps then draw the jumping rover
public void jump(Canvas canvas, boolean up) {
if (up && jumpHeight < 500) {
... | {
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### Renaldo
Yes, I figured out what I was doing wrong. instead of adding [(1/100) + (1/200) + (1/300)]
I was doing 1/600. lol. Gotta be careful. Thanks for your help.
8. Feb 24, 2013
### Equilibrium
So is it like this:
the previous charge of the energized capacitor is used to charge other capacitors. The previous e... | {
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thermodynamics, phase-transition, heat-engine, phase-diagram
In the unlikely event that your process actually does deal with subcooled refrigerant, you would need to post a process drawing so others on this site could determine how the stated process conditions are being achieved. | {
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organic-chemistry, smell
$\pu{MW = 278.5 Da}$, $\pu{\rho = 0.9 g/cm^3}$ $\ce{[6]}$
=> estimated molecular volume ≈ $\pu{510 Å^3}$
Iodoform:
$\pu{MW = 393.732 Da}$, $\pu{\rho = 4.008 g/cm^3}$ $\ce{[7]}$
=> estimated molecular volume ≈ $\pu{160 Å^3}$
Even if the density of labdane were, say, 20% higher than that of the ... | {
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javascript, strings, node.js, formatting
let testingText = `Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam blandit mauris id venenatis tincidunt. Vestibulum at gravida sapien. Mauris tellus augue, aliquet sed laoreet blandit, pulvinar sed felis. Phasellus nec est vitae enim blandit facilisis.
Vestibul... | {
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geophysics, radioactivity
other possibilities by emission of a 1764.494 keV gamma photon (15.36 % of beta decays). The decay can produce a large number of gamma ray lines, but most happen with low probability. You can have a look at page 23 of this 214Bi table of radionuclides extract to get an impression. | {
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"tags": "geophysics, radioactivity",
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imu, navigation, gps, robot-localization
Re: your question about whether the filter should be able to keep the position static, the answer is that it's only going to be as good as the input data. Your accelerations are noisy, yes, but they are almost certainly not zero-mean, so even if the filter is able to sort out t... | {
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algorithms, complexity-theory, graphs, data-structures
//Divide the bounding box into a grid of cells
cellSizeX = (maxX - minX) / gridSize
cellSizeY = (maxY - minY) / gridSize
//Iterate over each cell in the grid
for i from 0 to gridSize-1:
for j from 0 to gridSize-1:
// Step 4: Calculate the ce... | {
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"tags": "algorithms, complexity-theory, graphs, data-structures",
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inorganic-chemistry, metal, reference-request, metallurgy, alloy
References:
H. Nowotny, E. Bauer, and A. Stempfl, “Die Kristallstrukturen von PtZn, PtCd und PdCd (English Translation: Crystal Structures of PtZn, PtCd, and PdCd),” Monatshefte für Chemie 1950, 81(7), 1164-1164 (In German; DOI: https://doi.org/10.1007/... | {
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"tags": "inorganic-chemistry, metal, reference-request, metallurgy, alloy",
"url": null... |
### Behavior of Inner depends on List dimensions?
Consider the following case: ...
507 views
### Reflect a Plot Object
I have a relatively simple operation I'd like to perform on a plot: I would like to reflect the plot across the x-axis. I do not have any tick labels, so making sure that the labels are not themselv... | {
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"openwebmath_score": 0.7307412028312683,
"tag... |
ros, rosdep, update, jetson-tk1, jetson
I did this as an example while I was running this and it was the furthest it has ever gotten.
Should I just wait for sunny days in the future where I will get lucky and everything will work? I would also like to note that the views on forum items with "rosdep update" all have >3... | {
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If you have any ideas, suggestions, or solutions, I would really appreciate it if you are willing to share them. Thank you for your time.
Define $g(x) := \int_a^x |f(t)| dt$ for $x \in [a, b]$. Then $g$ is differentiable, non-negative, $g(a) = 0$ and $$g'(x) = |f(x)| \leq M \int_a^x |f(t)| dt = M g(x) \, .$$ Now let $... | {
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over the cross section is parabolic, as plotted in Fig. Circular cross sections are usual in sewer channels and the sedimentation of suspended material is a significant matter in such sections. Direct shear stress in pins. Let be the initial (unstrained) radius. Due to the Circular section of the shaft, It has been con... | {
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"lm_q2_score": 0.8244619220634456,
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"openwebmath_score": 0.7363621592521667,
"ta... |
performance, vba, excel
StartingLine = StartingLine + LinesToRead + 1
'Adjust ending line to read as dividing by the number of files -
'won't divide evenly (most of the time)
If i = NumberOfFiles - 1 Then
EndingLine = UBound(FileData)
Else
EndingLine = EndingLin... | {
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homework-and-exercises, electric-circuits, electrical-resistance, capacitance, inductance
And yes, the results are different. Why? Where am I going wrong? EDIT#2: Here:
http://www.animations.physics.unsw.edu.au/jw/images/AC_files/resonancev(t).gif
is an image of the waveforms in this circuit.
You can't simply add th... | {
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acid-base
So considering the after effect we consider $\ce{B(OH)3}$ as an acid and as it finally liberates 1 electron per molecule (though after accepting $\ce{OH-}$), we still can consider it to be a monobasic Lewis acid. At least, Wikipedia calls it a monobasic Lewis acid. | {
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Wouldn't $x+h$ give a different output than $x$ (hence making a difference to the second coordinate)? Or have I misunderstood the statement?
Sure. But as we consider the entire set of points, the $x$ output will be achieved at $x-h$ by $(x-h)+h$.
It is $(x,f(x)) \neq (x+h,f(x+h))$ but $\{\,(x,f(x))\,|\,x \in \mathbb{R}... | {
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"ta... |
FieldDescription
`'Streams'`
A `RandStream` object or cell array of such objects. If you do not specify `Streams`, `gardnerAltmanPlot` uses the default stream or streams. If you specify `Streams`, use a single object except when all of the following conditions exist:
• You have an open parallel pool.
• `UseParallel`... | {
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"lm_q1q2_score": 0.8099852328426145,
"lm_q2_score": 0.8333245870332531,
"openwebmath_perplexity": 2100.2747338587874,
"openwebmath_score": 0.809947669506073,
"tags": n... |
regular-languages, formal-grammars, finite-automata, regular-expressions
For each of these 2 languages, it is easy to find the regular
expression (above) or to give a regular grammar or a finite-state
automaton (FA). Each has a 3 states FA that recognizes it (4 states including a dead state).
To get a FA for the langu... | {
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"tags": "regular-languages, formal-grammars, finite-automata, regular-expressions",
"url": null... |
java, algorithm, pathfinding
Double tentativeCost = distance.get(currentNode) +
normalizedWeight;
if (!distance.containsKey(childNode)
|| distance.get(childNode) > tentativeCost) {
open.add(new NodeHolder(childNode, tentativeCost));... | {
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"openwebmath_score": null,
"tags": "java, algorithm, pathfinding",
"url": null
} |
matlab, filters, audio, adaptive-filters, autoregressive-model
The limitation of the spectral factorization method is that it produces a model that might not be unique. Durbin's method, on the other hand, first estimates an all-pole model for the moving average signal and then computes a corresponding set of coeffici... | {
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"openwebmath_score": null,
"tags": "matlab, filters, audio, adaptive-filters, autoregressive-model",
"url": null
} |
urdf, ros-melodic, transform
But now that I don't have a robot, I can simply pretend that there is one, and then measure the distances from that arbitrary point (corner of the station, for instance) to the camera, I guess. That would be my camera's position
well, yes. But I wouldn't "pretend". That's not needed. Ther... | {
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"tags": "urdf, ros-melodic, transform",
"url": null
} |
signature KEY =
sig
type t
val compare : t * t -> order
end
structure K :> KEY =
struct
type t = int
val compare = Int.compare
end
signature ParmBST =
sig
type T (* abstract *)
datatype E = Leaf | Node of T * K.t * T
val size : T -> int
val expose : T -> E (* exposes structure, not internal info *)
val j... | {
"domain": "kokecacao.me",
"id": null,
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"openwebmath_score": 0.9949945211410522,
"tags... |
gas, power-engineering
You can definitely use the longer times found with CCGT when describing ST power plants - although even longer times will be found (gas burners and big boilers are cheaper to build than gas turbines; the CCGT will usually be smaller than ST plant). | {
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"tags": "gas, power-engineering",
"url": null
} |
python, performance, beginner, python-3.x
if __name__ == '__main__':
invar = sys.argv[1]
target = int(sys.argv[2])
if invar in globals():
invar = eval(invar)
print(*makechain(invar, target), sep='\n')
I want to ask about the makechain function, I used sets because somehow the results can conta... | {
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"tags": "python, performance, beginner, python-3.x",
"url": null
} |
Definition 7.3.11 An algebraic number is a root of a polynomial, whose coefficients are rational. If a number is not algebraic, it is called transcendental.
For example, is an algebraic number as it is a root of the polynomial . The number and the number (basis of the natural logarithm) are transcendental.
Theorem ... | {
"domain": "ac.il",
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"lm_q2_score": 0.8056321913146127,
"openwebmath_perplexity": 758.2219569575739,
"openwebmath_score": 0.9471578598022461,
"tags": null,
... |
electromagnetism, electrostatics, equilibrium
So in the paper linked in the question above, the disk cannot be a conductor. It should instead be thought of as a certain portion of free space with a specified boundary. | {
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"tags": "electromagnetism, electrostatics, equilibrium",
"url": null
} |
.net, security, validation, f#
Finally, after a lot of thinking, I managed to rewrite the takeThrough function with tail-call recursion, instead of the original method (which didn't use tail-call recursion).
let takeThrough predicate list =
let rec loop acc sourceTemp =
let head = sourceTemp |> List.head
... | {
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"tags": ".net, security, validation, f#",
"url": null
} |
special-relativity, speed-of-light, velocity
Incidentally, this Doppler shift of light is the most common technique astronomers use to measure the velocities of astrophysical objects. The trouble is that we only have one measuring station (Earth), so we can only get one component of the velocity vector with this metho... | {
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"tags": "special-relativity, speed-of-light, velocity",
"url": null
} |
So $$\Phi$$ is a contraction mapping on $$\mathcal{A}$$, and hence, by the contraction mapping theorem,
• There exists a unique $$F \in \mathcal{A}$$ for which $$\Phi[F] = F$$, and
• Such $$F$$ is realized as the limit $$\Phi^{\circ n}[f]$$ as $$n\to\infty$$ for arbitrary initial choice $$f \in \mathcal{A}$$.
Finally... | {
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"lm_q1q2_score": 0.8080666254192675,
"lm_q2_score": 0.8221891305219504,
"openwebmath_perplexity": 294.9393067661037,
"openwebmath_score": 1.000002145767212,
"tags... |
c++, multithreading, event-handling, lambda, signal-handling
It is much better to write it as:
_messagePresent.wait(lk, [this](){return !_queue.empty();});
So the wait condition here is encapsulated. I'd use wait without the condition only in some odd cases.
EventLoop::newThreadInstance()
// BEWARE: Apparently... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, multithreading, event-handling, lambda, signal-handling",
"url": null
} |
java, immutability
The fact that get() throws an IOException or a ClassNotFoundException bothers me because it makes the current underlying implementation "leaking" out of your class. Who wants (and expects) to have to handle an IOException when getting a value from a Map ?
Since these exceptions are not supposed to h... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, immutability",
"url": null
} |
fluid-dynamics, pressure, bernoulli-equation
How do I apply Bernoulli equation in leaked pipe situation? And how does the pressure (in the pipe, upstream the leak) change after the leak appeared? Assuming you know the leak rate, you can approximate the flow rate increases by the leak rate, which is though not exact. K... | {
"domain": "physics.stackexchange",
"id": 33341,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "fluid-dynamics, pressure, bernoulli-equation",
"url": null
} |
python, tree, file-system, formatting
* ignore_hidden: Ignore hidden files (starting with a period).
Defaults to True. [type: boolean]
* regex: If set, only matching files will be shown.
Set to None to show all files. Defaults to None.
[type: str / None]
Returns... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, tree, file-system, formatting",
"url": null
} |
gazebo
Title: world shifts after reset
For a few (not all) of my world files, the world (as in, the walls and static objects) suddenly move (as in rotate and translate, all together) after calling the '/gazebo/reset_world' service. All the walls and static objects maintain the same position relative to each other. Th... | {
"domain": "robotics.stackexchange",
"id": 4099,
"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": "gazebo",
"url": null
} |
python, beginner, python-3.x, random, django
You also handle forms a bit wrong: grabbing values from request.POST directly defeat the purpose of using forms in the first place and especialy form validation. Besides, what happens when the form is not valid (form.is_valid() returns False)? You'll get a NameError on pw_l... | {
"domain": "codereview.stackexchange",
"id": 23846,
"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": "python, beginner, python-3.x, random, django",
"url": null
} |
general-relativity, black-holes, quantum-gravity, quantum-interpretations
McCorkle,
Hadley
I also found:
McCorkle
And then there is Mendel Sachs who has written a number of books purporting to derive QM from GR. I would like to add a little to Lubos's answer:
First a historical note: this is what Einstein proposed as ... | {
"domain": "physics.stackexchange",
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"tags": "general-relativity, black-holes, quantum-gravity, quantum-interpretations",
"url... |
newtonian-mechanics, angular-momentum, orbital-motion, satellites
I am going to guess no because of my response to the previous part. A space station has a great deal of linear and angular momentum. To exert enough force and torque to change those would require high impact speeds. Since most of the space station's ... | {
"domain": "physics.stackexchange",
"id": 26739,
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"tags": "newtonian-mechanics, angular-momentum, orbital-motion, satellites",
"url": null
... |
Matthew and Christopher wrote:
If we have a pair $$f \dashv g: \mathcal{X} \to \mathcal{Y}$$ of adjoint short maps then can we construct an equivalence between $$\mathcal{X}$$ and $$\mathcal{Y}$$?
That's a nice question! But the first thing to note is that we haven't officially discussed adjoint functors between enri... | {
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"lm_q1q2_score": 0.8234861578181902,
"lm_q2_score": 0.8479677545357568,
"openwebmath_perplexity": 911.4152777279234,
"openwebmath_score": 0.8552206158638,
"tag... |
c++, performance, template, c++20, proxy
friend constexpr auto operator==(T const& t, LengthProxy const& p) { return (t * t) == p._length_squared; }
friend constexpr auto operator!=(T const& t, LengthProxy const& p) { return (t * t) != p._length_squared; }
friend constexpr auto operator<(T const& t, LengthProx... | {
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"openwebmath_score": null,
"tags": "c++, performance, template, c++20, proxy",
"url": null
} |
java, beginner, interview-questions
public static Point translateToPoint(String position) {
return transformer.get(position);
}
public static Map<String, Point> unmodifiableMap() {
return Collections.unmodifiableMap(transformer);
}
} | {
"domain": "codereview.stackexchange",
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"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
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"openwebmath_score": null,
"tags": "java, beginner, interview-questions",
"url": null
} |
Similarly, the intersection of the sphere with the $\displaystyle xz$ plane is also a circle. This circle passes through the points $\displaystyle A(12,\ 0,\ 0),\ C(0,\ 0,\ 4),\ O(0,\ 0,\ 0)\,.$ The center of this circle is located at $\displaystyle (6,\ 0,\ 2)\,,$ so the center of the sphere lies on the line $\display... | {
"domain": "mathhelpforum.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9923043519112751,
"lm_q1q2_score": 0.8772360356320229,
"lm_q2_score": 0.8840392909114836,
"openwebmath_perplexity": 263.76071439334464,
"openwebmath_score": 0.8563159704208374,
"ta... |
Since $\sin x \le x$ for $x\ge 0$ and $0\le \frac{\pi}{3^n}\le \pi$, $$0\le n^3 \sin\frac{\pi}{3^n} \le \frac{n^3 \pi}{3^n}$$ and $\sum_{n=1}^{\infty}\frac{n^3 \pi}{3^n}$ converges by ratio test. By comparison test, given series converges.
You can evaluate the limit in this way
\begin{align} \lim_{n\to\infty} \left( ... | {
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"lm_q2_score": 0.8438951084436077,
"openwebmath_perplexity": 140.97668246724376,
"openwebmath_score": 0.9995111227035522,
"ta... |
ros2
###URDF
<?xml version="1.0"?>
<robot name="single_joint">
<material name="blue">
<color rgba="0 0 0.8 1"/>
</material>
<link name="base_link">
<visual>
<geometry>
<cylinder length="0.6" radius="0.2"/>
</geometry>
</visual>
<collision>
<geometry>
... | {
"domain": "robotics.stackexchange",
"id": 37725,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros2",
"url": null
} |
life, early-universe
Title: What is the probability that we are the first ever intelligent life in the whole universe? What is the probability that we are the first ever intelligent life developed all over the universe?
Everything starts somewhere, Is there any probability that we are the beginners to be part of intel... | {
"domain": "astronomy.stackexchange",
"id": 2098,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "life, early-universe",
"url": null
} |
qiskit, programming, quantum-algorithms
Linear solvers, including HHL, was moved from Qiskit Aqua to Qiskit Terra. This function is still in the latest released version, but it was deprecated a while ago and will finally be removed in the next release. The code was moved into a separate repository, ahead of this next ... | {
"domain": "quantumcomputing.stackexchange",
"id": 4752,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "qiskit, programming, quantum-algorithms",
"url": null
} |
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