text stringlengths 49 10.4k | source dict |
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# Among $2n$ items, $n$ are the same. How many ways are there to choose $n$ items from $2n$ items?
Among $2n$ items, $n$ are the same. How many ways are there to choose $n$ items from $2n$ items?
So, first thought is: n are the same and n are different.
I can't understand how we get to $2^n$ with this solution:
The... | {
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"lm_q1q2_score": 0.8147536310084469,
"lm_q2_score": 0.8311430457670241,
"openwebmath_perplexity": 176.79763279815322,
"openwebmath_score": 0.7795632481575012,
"ta... |
quantum-mechanics, homework-and-exercises, wavefunction, schroedinger-equation, harmonic-oscillator
Edit:
If we write the QHO solutions in terms of parabolic cylindrical functions, we can easily write down the second set of normally-diverging solutions: we have $\psi^{QHO}_n(x) \propto D_n(x \sqrt{2})$, and so
$$\psi... | {
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"tags": "quantum-mechanics, homework-and-exercises, wavefunction, schroedinger-equation, ha... |
nlp, named-entity-recognition
where as for the input:
'Former Vice President Dick Cheney told conservative radio host Laura Ingraham that he "was honored" to be compared to Darth Vader while in office.'
the output is:
Tree('S', [('Former', 'JJ'), ('Vice', 'NNP'), ('President', 'NNP'),
Tree('NE', [('Dick', 'NNP'... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "nlp, named-entity-recognition",
"url": null
} |
biochemistry, dna, rna
Title: Can a dNTP be built into a RNA strand? DNA consists of deoxyribonucleotides, RNA consists of ribonucleotides. They differ mainly (apart from the uracil / thymine difference) in the sugar part, the deoxyribose and the ribose. Those two molecules differ in the hydroxy group in the ribose wh... | {
"domain": "biology.stackexchange",
"id": 1142,
"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": "biochemistry, dna, rna",
"url": null
} |
c#, datetime, extension-methods
Title: Extension methods for Daylight Savings Time dates Just wondering if anyone had any suggestions for improvements. I created these extension methods so it's easier to get the start and end dates of Daylight Savings Time from the TimeZoneInfo class.
public static class ExtensionMeth... | {
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"tags": "c#, datetime, extension-methods",
"url": null
} |
navigation, ros-kinetic, amcl
<param name="odom_alpha3" value="0.8"/>
<param name="odom_alpha4" value="0.2"/>
<param name="laser_z_hit" value="0.5"/>
<param name="laser_z_short" value="0.05"/>
<param name="laser_z_max" value="0.05"/>
<param name="laser_z_rand" value="0.5"/>
<param name="laser_sigma_hit" value="0.2"/>
... | {
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"openwebmath_score": null,
"tags": "navigation, ros-kinetic, amcl",
"url": null
} |
\begin{align*} \sum_{j=1}^{m}c_{j}\vect{u}_j &=\sum_{j=1}^{m}c_{j}\left(\sum_{i=1}^{t}a_{ij}\vect{v_i}\right) &&\text{ Definition TSVS}\\ &=\sum_{j=1}^{m}\sum_{i=1}^{t}c_{j}a_{ij}\vect{v}_i &&\text{ Property DVA}\\ &=\sum_{i=1}^{t}\sum_{j=1}^{m}c_{j}a_{ij}\vect{v}_i &&\text{ Property CMCN}\\ &=\sum_{i=1}^{t}\sum_{j=1}^... | {
"domain": "aimath.org",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9879462197739625,
"lm_q1q2_score": 0.8565847046997394,
"lm_q2_score": 0.867035763237924,
"openwebmath_perplexity": 325.4569079225906,
"openwebmath_score": 0.9146049618721008,
"tags": ... |
r
#DECILE 5
t_prag_top_total_income_50<-decili_total_income_neto\[5,1\]
t_prag_top_total_income_filter_50<-filter(data2, NET_INCOME> t_prag_top_total_income_40, NET_INCOME<=t_prag_top_total_income_50)
t_prag_top_total_income_filter_50_tax<-sum(t_prag_top_total_income_filter_50$TAX)
t_tax_share_50<-((t_pr... | {
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"openwebmath_score": null,
"tags": "r",
"url": null
} |
graph G must be connected R.... That don ’ t always connected connected components than G or disconnected aren ’ t contain any self-loop is multi. It … simple and Non-simple graph or you want to share more information about the reverse?... One, both nodes are inside the same degree yields that every graph admitting a h... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9706877675527112,
"lm_q1q2_score": 0.8416210110733033,
"lm_q2_score": 0.8670357649558006,
"openwebmath_perplexity": 697.3468618197284,
"openwebmath_score": 0.5961736440658569,
"tags": nul... |
fluid-dynamics, flow, drag, aerodynamics, turbulence
Title: Is it possible to convert separated flow back to attached? Sometimes you cannot easily create ideal single streamlined shape...
Would it be possible to attach separated flow again somehow?
The point is - you have some base setup (average cyclist) and want to ... | {
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"openwebmath_score": null,
"tags": "fluid-dynamics, flow, drag, aerodynamics, turbulence",
"url": null
} |
ros, ros-kinetic, ubuntu, std-msgs, ubuntu-trusty
this->rosPub.publish(msg);
Originally posted by kump with karma: 308 on 2019-01-29
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by gvdhoorn on 2019-01-29:
Please note that you're not initialising the layout field here. Subscri... | {
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"tags": "ros, ros-kinetic, ubuntu, std-msgs, ubuntu-trusty",
"url": null
} |
electromagnetism, optics, energy, electromagnetic-radiation, double-slit-experiment
Title: Does polarisation matter in double slit experiment? So I am studying diffraction, in particular the diffraction of electromagnetic waves using a double slit set up. However, there seems to be no mention of the polarisation of el... | {
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"tags": "electromagnetism, optics, energy, electromagnetic-radiation, double-slit-experimen... |
python, python-3.x, graph, heap
path = [f]
while f in prev and prev[f] != None:
f = prev[f]
path.append(f)
return path[::-1], d
if __name__ == '__main__':
g = {'s':[('v',1),('w',4)],'v':[('w',2),('t',6)],'w':[('t',3)],'t':[]}
print(dijkstra(g, 's', 't') == (['s', 'v', 'w', 't'], 6))
... | {
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"tags": "python, python-3.x, graph, heap",
"url": null
} |
lambda-calculus, functional-programming, linear-logic
Does that mean that, for all terms of λEA, there is a valid type derivation?
Is this a common phenomena, i.e., are there other systems with this same characteristic, or is it something particular of linear logic based proof languages? For question 1, the answer is ... | {
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"tags": "lambda-calculus, functional-programming, linear-logic",
"url": null
} |
ros, boost, callback, transform
Title: tf::TransformBroadcaster in callback
Hi,
So I was trying to have a transform published over tf as a result of a callback call, which made me think I had to have a tf::TransformBroadcaster as a global variable. However these can't be declared before the ros::NodeHandle is created... | {
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"tags": "ros, boost, callback, transform",
"url": null
} |
python, game-of-life
# Populate the world with random living/dead (50% each) cells
world = random_integers(0, 1, (worldHeight, worldWidth))
simulate(world, 50) The main thing I want to point is that your algorithm is too simple since it uses matrix (list of lists) as a playing field. If it will be 1000*1000 y... | {
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"tags": "python, game-of-life",
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} |
turtlebot
[ INFO] [1470897010.283830842]: Centroid at -0.111009 0.131917 0.520000 with 26443 points
[ INFO] [1470897011.313652663]: Centroid at -0.109750 0.132123 0.520000 with 26477 points
[ INFO] [1470897012.335891665]: Centroid at -0.109882 0.132068 0.520000 with 26448 points
[ INFO] [1470897013.347062630]: Centroi... | {
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"id": 25497,
"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": "turtlebot",
"url": null
} |
c++, performance, sorting, quick-sort, radix-sort
---------------------size pow 10------------------
--------------------------------------------------
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
--------------------------------------------------
max|1 |0.002613|0.020518|0.216481|2.23... | {
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"openwebmath_score": null,
"tags": "c++, performance, sorting, quick-sort, radix-sort",
"url": null
} |
special-relativity
Title: Typical Mathematical Questions about the Lorentz-Transformation In SR (Special Relativity) we use the Lorentztransformation (LT) to relate one frame of reference to another. Say S to S' via a LT that depends only on v where v is the relative velocity between S and S'.
In Mathematics (and QM) ... | {
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"openwebmath_score": null,
"tags": "special-relativity",
"url": null
} |
time
Title: If we suddenly lost track of time, how would we know what time is now? If we hypothetically lost all watches and all devices that keep track of time, how would we say what is the current time? Or we actually don't and time is just a convention? For any system, whether classical or quantum, the time evoluti... | {
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"tags": "time",
"url": null
} |
the letter B occurs 3 times. Like a "super wildcard". Not all of those are distinguishable, because some words occur more than once on a single line. (d) type and case of letters, spacing between letters and punctuation marks; (e) joining words together or separating the words does not make a name distinguishable from ... | {
"domain": "xrayworks.de",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9871787857334057,
"lm_q1q2_score": 0.8350964261454992,
"lm_q2_score": 0.8459424353665381,
"openwebmath_perplexity": 1211.2152926140193,
"openwebmath_score": 0.31705012917518616,
"ta... |
ros, navigation, move-base, fixed-frame, transform
Title: For frame[base_link]: No transform to fixed frame using IMU
Hi all,
I have a mobile robot and I would like it to navigate around a room and I already have a map of the room. I am using rotary encoders for odometry. I am using robot_pose_ekf to merge data from ... | {
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"openwebmath_score": null,
"tags": "ros, navigation, move-base, fixed-frame, transform",
"url": null
} |
quantum-mechanics, homework-and-exercises, dirac-delta-distributions
Proceeding from the last step:
$$\phi(p)=\frac{1}{2\pi\hbar}\int_{-\infty}^{\infty}dx\exp\left(\frac{ix}{\hbar}(p_0-p)\right)$$
putting $x=\hbar k$
$$\phi(p)=\frac{1}{2\pi\hbar}\int_{-\infty}^{\infty}\hbar e^{ik(p_0-p)}dk$$
$$\phi(p)=\frac{1}{2\pi}2\... | {
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"tags": "quantum-mechanics, homework-and-exercises, dirac-delta-distributions",
"url": nu... |
roslaunch
Title: use parameters from python launch file in node
I am trying to use parameters specified in my .launch.py file, but a ParameterNotDeclaredException is thrown when accessing any parameter. Does anyone know why? I try to access the parameters like this from within my Node:
self.get_parameter('buffer_size... | {
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"tags": "roslaunch",
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# Another factoring trick
The other day, while helping my friend on homework, I was stuck on a problem. And by stuck I mean I didn't want to guess rational solutions and then synthetic to find if they worked because that's too main stream and I had already done that to change it from a 4th degree to a third.
So I jus... | {
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"lm_q1_score": 0.9664104943498961,
"lm_q1q2_score": 0.8194849349971642,
"lm_q2_score": 0.8479677526147223,
"openwebmath_perplexity": 793.5849130855869,
"openwebmath_score": 0.9696036577224731,
"tags": ... |
php, mysql, pdo
It is clear from your comments that you are already considering a different dsn. You are needlessly locking PDO down to mysql localhost connections. All of these settings make your class less reusable.
Catching and calling exit further locks your class down to self-destructing. It gives no chance fo... | {
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"tags": "php, mysql, pdo",
"url": null
} |
Double application of the original matrix with “ T ” in superscript, like Aᵀ 4.. Change overall producing another matrix with its definition and properties are like a one scalar! Off-Diagonal blocks are zero. will support those insights in the future = ( number of vectors. Diagonalizable Amust be sym-metric be of the i... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9780517462851321,
"lm_q1q2_score": 0.8332539275558383,
"lm_q2_score": 0.8519528038477825,
"openwebmath_perplexity": 640.7221725232843,
"openwebmath_score": 0.7220755815505981,
"tags... |
special-relativity, symmetry, group-theory, time-reversal-symmetry
I get that if $\Lambda^0_0 < 0$ the sign in front of $ct$ changes, but it is not guaranteed that the whole $x'^0$ is actually negative. Could someone please explain it to me? The correct condition for an orthochronous Lorentz transformation is that it ... | {
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"id": 96776,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "special-relativity, symmetry, group-theory, time-reversal-symmetry",
"url": null... |
botany, infectious-diseases
wasp damage
This, in combination with the rain, is most likely what caused damage to your cherries.
Is it correct to call them "Cherry scabs"?
I just call it scarring, and I believe many other people do too. I'm not sure if there's a specific term for fruit damage that's then been "scabb... | {
"domain": "biology.stackexchange",
"id": 7774,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "botany, infectious-diseases",
"url": null
} |
charge, quantum-spin
Title: How would you calculate the ratio of electric repulsion between two electrons and magnetic attraction? Electrons have both magnetic dipole moments and charge. Two electrons separated by a distance would repel electrically but it stands to reason they would rotate their spins so their magne... | {
"domain": "physics.stackexchange",
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "charge, quantum-spin",
"url": null
} |
differential-geometry, metric-tensor, tensor-calculus, coordinate-systems, covariance
Title: Transformation law for Christoffel's first kind
I don't understand this particular part in this image. I am following schaum's series book on "vector analysis". I didn't find any explanation for it. I also tried searching in ... | {
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"id": 47000,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "differential-geometry, metric-tensor, tensor-calculus, coordinate-systems, covaria... |
homework-and-exercises, classical-mechanics, lagrangian-formalism, differentiation
Title: Clarification on a Goldstein formula steps (classical mechanics) At page 20 of Classical Mechanics' Goldstein (Third edition), there are these two steps given between eqs. (1.51) and (1.52):
$$\sum_i m_i \ddot {\bf r}_i \cdot \fr... | {
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"id": 5123,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, classical-mechanics, lagrangian-formalism, differentiation"... |
bond, coordination-compounds, transition-metals, hybridization
What about other chemical species?
You mentioned that hybridisation works well for "other compounds." That is really not always the case, though. For simple compounds like water, etc. there are already issues associated with the standard VSEPR/hybridisatio... | {
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"tags": "bond, coordination-compounds, transition-metals, hybridization",
"url": null
} |
c, generics, c11
map_generic( (map_func)my_sqrt,
ELEMS,
xs,
sizeof(xs[0]),
ys,
sizeof(ys[0]));
for (unsigned i = 1; i < ELEMS; ++i) {
printf("%f\n", ys[i]);
}
return EXIT_SUCCESS;
}
GCC 13.2 with -std=c17 -march... | {
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"tags": "c, generics, c11",
"url": null
} |
python, embedded, raspberry-pi
error_plus_minus_res = round(error_magnitude_res / 2, 3)
cal_resistance_tolerance = round(
cal_resistances[i] * CAL_REF_RESISTANCE_TOL, 3)
log_print('avg_voltage:%.3f +/-%.3f\navg_res:%.3f +/-%.3f\n' % (
avg_voltage, error_plus_minu... | {
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"openwebmath_score": null,
"tags": "python, embedded, raspberry-pi",
"url": null
} |
calibration, ros-melodic, camera-calibration
Since the image has to be rectangular to be stored in memory, the remaining pixels are filled with a black color.
The getOptimalNewCameraMatrix() scales the camera matrix K and computes the new image size so that the undistorted (rectified) image either contains no invalid ... | {
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"tags": "calibration, ros-melodic, camera-calibration",
"url": null
} |
robotic-arm, navigation, armhf, map-server, move-base
The error from the kernel:
Alignment trap: not handling instruction ed977b00 at [<b6cd2112>]
Unhandled fault: alignment exception (0x011) at 0xb3d01e39
Anybody have any thoughts?
Originally posted by Raptor on ROS Answers with karma: 377 on 2013-01-15
Post score:... | {
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"tags": "robotic-arm, navigation, armhf, map-server, move-base",
"url": null
} |
data-structures, trees
Are radix tries typically implemented as Patricia tries (and, hence, often considered the same)? Or can no such generalizations be made?
To be honest, I do not have an answer for this question. It seems that both data structures were proposed around the same time by different authors. For histo... | {
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"tags": "data-structures, trees",
"url": null
} |
thermodynamics, statistical-mechanics
$$p(E)=\int \delta(E-E(\Gamma))\frac{e^{-\beta E(\Gamma)}}{Z}d\Gamma$$
Which is a complicated $6N$-dimensional integral! So in general you will see that this question is extremely difficult and only soluble numerically (and usually not even to satisfactory precision). However, the... | {
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"tags": "thermodynamics, statistical-mechanics",
"url": null
} |
c++, array, template-meta-programming
Title: Fixed array with configurable bounds A interesting challenge was brought to my attention: to "flip" an array. I thought it might be more convenient if its bounds were symmetrical, say [-N..N] instead of [0 .. 2N + 1].
Now I'm curious about what could be done to make this Ar... | {
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has rank $n$. Then the morphism $f : Z = \mathop{\mathrm{Spec}}(R[x_1, \ldots , x_ n]/I) \to \mathop{\mathrm{Spec}}(R)$ is unramified at the point $x \in Z \subset \mathbf{A}^ n_ R$ corresponding to $\mathfrak q$. Clearly we must have $m \geq n$. In the extreme case $m = n$, i.e., the differential of the map $\mathbf{A... | {
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"tags": n... |
• We also have a perfectly good way to describe the set $\{0, 1, 2, 3, \ldots\}$, namely the non-negative integers. Therefore I do not accept argument 2. – celtschk Apr 6 '15 at 22:11
• Monoids are often more useful than semigroups without additive identities. Counting numbers (natural numbers without "zero") are a sem... | {
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"lm_q2_score": 0.8376199653600372,
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"openwebmath_score": 0.8634220957756042,
"tag... |
java, sql, jdbc
UserInfoTable and ContactTable have a one-to-many relationship, with ContactTable having UserInfoID as a foreign key.
public static boolean addUser(User user) {
Connection connection = getConnection();
try {
PreparedStatement insertUser = connection.prepareStatement(Insert_User);
insertUser.setString(1... | {
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"tags": "java, sql, jdbc",
"url": null
} |
np-hard, approximation, greedy-algorithms, number-theory
Using induction, you can prove that after $k$ iterations, $(1-1/k)^k \cdot |U|$ elements are uncovered. Therefore, the number of covered elements after $k$ iterations are at least $(1-(1-1/k)^k) \cdot |U|$. | {
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"tags": "np-hard, approximation, greedy-algorithms, number-theory",
"url": null
} |
epsilon, theta, kappa, phi, pi, rho, and sigma are provided in two different versions. Therefore, special environments have been declared for this purpose. An online LaTeX editor that's easy to use. {\displaystyle f(n)=n^{5}+4n^{2}+2|_{n=17}\,}. n The equation* and displaymath environments are functionally equivalent. ... | {
"domain": "stereo7.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9790357591818726,
"lm_q1q2_score": 0.8004346458121024,
"lm_q2_score": 0.8175744739711883,
"openwebmath_perplexity": 10820.21312091563,
"openwebmath_score": 0.6875969171524048,
"tags": nu... |
quantum-mechanics, refraction, gravitational-waves, dispersion
Title: Do gravitational waves disperse/refract (like EM waves in a prism)? I have read this question:
What is the relationship between a gravitational wave and a graviton?
where kingledion says:
Gravitational waves were theorized a century ago and recentl... | {
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"tags": "quantum-mechanics, refraction, gravitational-waves, dispersion",
"url": null
} |
python, sqlalchemy
parse_games.py REVISED
class Parser:
DISPLAY_NAME: str
def __init__(self, dic):
self._dic = dic[BOOK]['eventGroup']
self.events = self._dic.get('events',())
self.categories = self._dic.get('offerCategories',())
class Gamelist:
DISPLAY_NAME = 'Gamelist'
... | {
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"tags": "python, sqlalchemy",
"url": null
} |
c#, memory-management, queue
Title: MemoryCache as a message broker? I'm in the middle of a project that was built around Microsoft's Message Queue service. During development all of our machines are on a domain and we were able to create a public queue accessible from the server and client.
When moving this to our te... | {
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"tags": "c#, memory-management, queue",
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} |
polarity, isotope
M. Trefler and H. P. Gush found the dipole moment to be very small, i.e. $\mathbf{p}=(5.85\pm0.17)\times 10^{-4}~\mathrm{D}$. Hence to speak of deuterium protide or protium deuteride is a stretch.
Since the effect is quite small in $\ce{HD}$ already, one can probably assume it will not have a signifi... | {
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"tags": "polarity, isotope",
"url": null
} |
# Implicit differentiation word problem involving the surface area of a cylinder
The radius, $$r$$, of the base of a circular cylinder increases by 2 feet per second while the height, $$h$$, decreases by 1 foot per second. How fast is the surface area of the cylinder changing when the height of the cylinder is $$50$$ ... | {
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"openwebmath_score": 0.9222725033760071,
"tag... |
python
# add start elements to bom, which later will be removed
bom = [[serial, None, part, part] for [serial, part] in order]
i = 0
# treat it as a queue, adding to it while looping
while i < len(bom):
[serial, parent, part, path] = bom[i]
i += 1
if part in d:
for s... | {
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"openwebmath_score": null,
"tags": "python",
"url": null
} |
navigation, ros-lunar, robot-localization, ros-jade, ros-indigo
Title: Specifics of sensor fusion algorithm of robot_localization package
Hello,
I am wondering how robot_localization package is formulating the sensor fusion problem if more than one sensor is used during the localization. Specifically, the sensors ope... | {
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"tags": "navigation, ros-lunar, robot-localization, ros-jade, ros-indigo",
"url": null
} |
ros, rospy, rosbridge, rosbridge-server
Title: Unable to load the manifest for package
I'm using rosbridge with catkin packages.
ros_rope (the webserver for the GUI) is started with a python script. At the same time rosbridge_websocket is started. Here's my launchfile:
<launch>
<node name="ros_rope_server" pk... | {
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} +R and y=-sqrt { r^2-x^2 } +R and y=-sqrt { r^2-x^2 +R... 2 where, R is the radius of the ring torus cylinder assuming the of! Let 's let R be the outer radius R + a any number of holes toroid is used... A cylinder assuming the radius of a torus by big and small radius the.. Axis of the trickiest parts of this donut-... | {
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"lm_q2_score": 0.8418256492357358,
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"openwebmath_score": 0.861656904220581,
"tag... |
$\begin{split}\begin{bmatrix} 1 & -1 \\ 0 & 1 \end{bmatrix}\end{split}$
Now let’s change its basis,
$\begin{split}\begin{bmatrix} \text{Change of basis matrix}^{-1} \end{bmatrix} A \begin{bmatrix} \text{Change of basis matrix} \end{bmatrix} \\ \Rightarrow \begin{bmatrix} 1 & -1 \\ 0 & 1 \end{bmatrix}^{-1} \begin{bmat... | {
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"openwebmath_score": 0.9996474981307983,
"tags": ... |
c++, beginner, console, file
std::ifstream file;
file.open(filename.c_str());
You should have all of this in main() and no longer have the class manage the creation, opening, and closing of the file. Let the user decide how they want to manage their file. You'll also be able to terminate from main() right away if t... | {
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"tags": "c++, beginner, console, file",
"url": null
} |
c#, programming-challenge
Title: Car Rental Optimization Inspired by this r/dailyprogrammer post, the task is too calculate which records to use in order to serve the most records without any of the records having overlapping time spans.
I accomplish this goal by sorting the list of records by their total days spanned... | {
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python, python-3.x
Then you call your script like this:
python3 generate.py --log_file test.log --input_file test.txt
Parameter order is free.
I have to admit I don't understand much about the purpose since I don't know about your input files.
If they are CSV then you might consider using the csv module. Then you sho... | {
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"tags": "python, python-3.x",
"url": null
} |
c++, algorithm, c++14, rags-to-riches
std::istream& operator>>(std::istream& in, Expression& expr)
{
char ch;
int val = 0;
while ( in >> ch )
{
if (isalpha(ch) )
{
expr.vars.insert(Variable(ch));
expr.cons += val;
val = 0;
}
... | {
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"tags": "c++, algorithm, c++14, rags-to-riches",
"url": null
} |
on the ellipse, we get the more common form of the equation. This equation, V3 - cartesian to cylindrical, is used in 1 page Show Calculators • Vector Calculator (3D) by KurtHeckman. Using a graphic calculator with parametric equations; 8. This online calculator finds the equation of a line given two points it passes t... | {
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"lm_q1_score": 0.9890130599601177,
"lm_q1q2_score": 0.803936395597884,
"lm_q2_score": 0.8128673201042492,
"openwebmath_perplexity": 436.5948135503946,
"openwebmath_score": 0.8174378275871277,
"... |
equipment
I was able to access the first description of this funnel in the German chemical literature from 1888 by Eduard Büchner and an earlier description by Hirsch again in 1888. It is just a one paragraph description by Hirsch. His funnel is conical and Büchner simply made it flat. Nothing fundamental about porcel... | {
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"tags": "equipment",
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} |
c++, game
class BubbleGame
{
private:
BubbleGame() { /* Never used */ };
BubbleGame(const BubbleGame& bubbleGame) { /* Never used */ };
vector<Bubble> m_bubbles;
vector<int> m_explodedIndices;
vector<int> m_freeIndicies;
Texture *m_bubbleTexture;
bool m_isActive;
int m_pointCoun... | {
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} |
vacuum, space
Title: What is in space? I was recently on a chat server having a random discussion about science stuff and someone I was talking to then made the comment that "space is not a complete vacuum and it's full of plasma / matter".
That got me thinking ... ok so I don't expect that the bulk of space is totall... | {
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"tags": "vacuum, space",
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ros, ros-melodic, boost
backtrace
#0 0x00007fffeebaefff in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007fffeebb042a in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007fffeeba7e67 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x00007fffeeba7f12 in __assert_fail () from /lib/x86_64-linux-gnu/li... | {
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"tags": "ros, ros-melodic, boost",
"url": null
} |
rotational-kinematics
where:
$$H_x=\left(\begin{array}{ccc}0&0&0\\0&0&-1\\0&1&0\end{array}\right);\quad H_y = \left(\begin{array}{ccc}0&0&1\\0&0&0\\-1&0&0\end{array}\right);\quad H_z = \left(\begin{array}{ccc}0&-1&0\\1&0&0\\0&0&0\end{array}\right)\tag{6}$$
The angles $\theta_j$ are the Euler angles, or pitch, yaw and ... | {
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"openwebmath_score": null,
"tags": "rotational-kinematics",
"url": null
} |
algorithms, sorting, efficiency, lists
Title: Efficiently sorting a list of integers depending on the index of said integers in a second list Introduction
Hi everyone,
I am currently pondering how to efficiently design an algorithm for a sorting problem and hope that someone here may help me out a bit.
The problem
I h... | {
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"openwebmath_score": null,
"tags": "algorithms, sorting, efficiency, lists",
"url": null
} |
c#, performance, active-directory, ldap
foreach (var item in allUsers)
{
cmd.Parameters[0].Value = item.Name; cmd.Parameters[1].Value = item.Company; cmd.Parameters[2].Value = item.Creation_Date; cmd.Parameters[3].Value = item.Department; cmd.Parameters[4].Value = item.Description;
... | {
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"id": 34610,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, performance, active-directory, ldap",
"url": null
} |
temperature, luminosity, wavelength
But since $f = c/\lambda$, we can replace $df$ with $df = -c\ d\lambda/\lambda^2$.
$$\frac{d}{df}\left(B_\lambda \frac{d\lambda}{df}\right) = \frac{\lambda^2}{c}\frac{d} {d\lambda}\left(B_\lambda \frac{\lambda^2}{c}\right) = 0. $$
Eliminating $\lambda = 0$ as a useless solution, m... | {
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"tags": "temperature, luminosity, wavelength",
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} |
haskell
-- in the closed form the integer part is always 0
divR5 :: FibNum -> Maybe Integer
divR5 (FibNum 0 n) = Just n
divR5 _ = Nothing
fibo :: Integer -> Integer
fibo n = flip div p2 . fromJust $ divR5 nom
where nom = pow fphi n - pow fpsi n
p2 = 2^n
addendum
Thanks a lot for the useful comments.
If it... | {
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"tags": "haskell",
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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... | {
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"url": null
} |
ros, rosmake, launch-file
make[3]: Entering directory `/home/turtlebot/mytele/build'
Linking CXX executable ../bin/mytele_keyboard
/usr/bin/ld: CMakeFiles/mytele_keyboard.dir/src/turtlebot_key.o: undefined reference to symbol 'vtable for boost::detail::thread_data_base'
/usr/bin/ld: note: 'vtable for boost::deta... | {
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"tags": "ros, rosmake, launch-file",
"url": null
} |
cardiology, fat-metabolism
Title: Can fats clog veins or capillaries? I know that so much fats running in the bloodstream could deposit in arteries, harden forming a plaque and cause atherosclerosis. But what about veins (which are formed from same types of layers as arteries) and capillaries?
I googled a bit but eve... | {
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"openwebmath_score": null,
"tags": "cardiology, fat-metabolism",
"url": null
} |
inorganic-chemistry, redox, transition-metals
Title: Fe with different charges Taken these reactions:
\begin{align}
\ce{2\overset{0}{Fe} + 3Cl2 &-> 2\overset{+3}{Fe}Cl3} \tag{1}\\
\ce{\overset{0}{Fe} + 2HCl &-> \overset{+2}{Fe}Cl2 + H2} \tag{2}
\end{align}
Why does $\ce{Fe}$ have +3 charge in the first example and +... | {
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"tags": "inorganic-chemistry, redox, transition-metals",
"url": null
} |
slam, navigation, kinect, opencv, gmapping
Originally posted by cleros on ROS Answers with karma: 15 on 2012-07-01
Post score: 1
Original comments
Comment by cleros on 2012-07-16:
I have also posted a similar but slightly more generalized question to this one at http://stackoverflow.com/questions/11489939/creating-se... | {
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• To clarify: Would this argument be equally valid if one were to drop all mention of ideals and consider the problem in thr context of $\mathcal{O}_K$ itself, with the element 8? – Coffee_Table Apr 8 '13 at 3:14
• @Coffee_Table Might I ask what you are referring to? Maybe you talk about idèles and adèles? Thanks in ad... | {
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There are two concepts going on simultaneously. Any automorphism $\phi:G \to G$ has trivial kernel by assumption. However, the set of maps $\{ \phi: G \to G\}$ can be given a group structure by composition: $\phi \circ\rho$ is associative, there is an identity, and inverses since all the maps are assumed to be automorp... | {
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"lm_q1_score": 0.9763105287006256,
"lm_q1q2_score": 0.8049308676561444,
"lm_q2_score": 0.8244619350028204,
"openwebmath_perplexity": 132.3386880114053,
"openwebmath_score": 0.9856984615325928,
"tag... |
redshift
Title: Can space-time expansion destroy light? I know that light shifts from high frequency(like gama rays) to low frequency (like radio waves) when traveling throw a gravitational field, this is called red shifting.
My question is: Is there a limit to this, what happens to the light wave when it can no longe... | {
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"lm_q2_score": null,
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"tags": "redshift",
"url": null
} |
machine-learning, logistic-regression
Title: Do logistic regression and softmax regression do the same thing? If the both do the same thing then which give us better accuracy? There is a key difference:
Softmax regression provides class probabilities for mutually exclusive classes.
Logistic regression treats class me... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning, logistic-regression",
"url": null
} |
symmetry, atoms
Title: Is hydrogen the same everywhere? Silly thought. Feel free to shoot it down
Does a hydrogen atom undergo any kind of change subject to it's environment?
If one were to study a hydrogen atom on the surface of Mercury, another above Earth, and a third in interstellar space - would they exhibit an... | {
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"tags": "symmetry, atoms",
"url": null
} |
ros, transforms, ros-melodic, tf2, transform
Title: Extract tf::Transform from tf::StampedTransform & tf::Stamped
I'm trying to find a cascaded transform but I'm running into the following errors :
tf::TransformListener listener;
tf::StampedTransform transform_cd;
try
{
for(unsigned int i=0; i<tag_detection_array.d... | {
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"tags": "ros, transforms, ros-melodic, tf2, transform",
"url": null
} |
A 3-D rotation should be a transformation $T:\mathbb{R}^{3}\to\mathbb{R}^3$ that preserves the Euclidean norm. For any two vectors $\mathbf{x}, \mathbf{y}$, $T(\mathbf{x}):=\mathbf{a}$ and $T(\mathbf{y}):=\mathbf{b}$. As $T$ also preserves the angle between two vectors, the parallelogram formed by $\mathbf{a}$ and $\ma... | {
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"id": null,
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"lm_q1_score": 0.9780517507633983,
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"lm_q2_score": 0.8267117919359419,
"openwebmath_perplexity": 202.30368764112902,
"openwebmath_score": 0.932620644569397,
"tag... |
quantum-mechanics, quantum-information, superposition, biophysics, open-quantum-systems
So, how would I write an equation for this? I was thinking about path integrals but couldn't find a way to use it. I know that for quantum superposition
$$ \psi(x) = a |S1\rangle + b |S2\rangle + c |S3\rangle + \ldots $$
and the pr... | {
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"tags": "quantum-mechanics, quantum-information, superposition, biophysics, open-quantum-sy... |
Recall that a (complex) abstract Lie algebra is a complex vector space ${{\mathfrak g}}$ (either finite or infinite dimensional) equipped with a bilinear antisymmetric form ${[]: {\mathfrak g} \times {\mathfrak g} \rightarrow {\mathfrak g}}$ that obeys the Jacobi identity
$\displaystyle [[X,Y],Z] + [[Y,Z],X] + [[Z,X],... | {
"domain": "wordpress.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9896718459575752,
"lm_q1q2_score": 0.8114253577749696,
"lm_q2_score": 0.8198933425148213,
"openwebmath_perplexity": 143.85039791894428,
"openwebmath_score": 0.9072800874710083,
"tags":... |
newtonian-mechanics, forces, free-body-diagram, string, centripetal-force
Title: Does centripetal force being equal to full tension dependent on if string is horizontal or vertical? If the string is not horizontal, is the centripetal force still equal to the full tension in the string and equivalently to the weight of... | {
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"tags": "newtonian-mechanics, forces, free-body-diagram, string, centripetal-force",
"url... |
urdf, catkin-make, ros-kinetic
# list of catkin workspaces
set(catkin_search_path "")
foreach(path ${CMAKE_PREFIX_PATH})
if(EXISTS "${path}/.catkin")
list(FIND catkin_search_path ${path} _index)
if(_index EQUAL -1)
list(APPEND catkin_search_path ${path})
endif()
endif()
endforea... | {
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"openwebmath_score": null,
"tags": "urdf, catkin-make, ros-kinetic",
"url": null
} |
javascript, node.js, api, email, express.js
// Replace IMG with SVG
$img.replaceWith($svg);
}, 'xml');
});
});
$('#signup-form').on('submit', function () {
var data = {};
var emailInput = document.getElementById('email');
data.email = emailInput.value;
$.ajax({
type: '... | {
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"tags": "javascript, node.js, api, email, express.js",
"url": null
} |
turing-machines, universal-turing-machines
Given a configuration $x$, is the state of $A$ equal to $x$ after $|x|$ steps from a blank initial configuration?
in $O(|x|^2)$ time.
Just use an expanded alphabet to overlap the target (input) configuration $x$, the current step evolving configuration and the next step conf... | {
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"tags": "turing-machines, universal-turing-machines",
"url": null
} |
differential-geometry, metric-tensor, tensor-calculus, vectors, notation
However, via contraction we have $(g_{ab} \hat{e}^a \otimes \hat{e}^b) \cdot (\hat{e}_c) = g_{ac}\hat{e}^a$, which maps the covector $\hat{e}_c \rightarrow g_{ac}\hat{e}^a$, so one can "schematically" think that the metric "lowers" the indices of... | {
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"tags": "differential-geometry, metric-tensor, tensor-calculus, vectors, notation",
"url"... |
\begin{remark} \label{remark-affine-dimension} If your scheme is affine then dimension is the same as the Krull dimension of the underlying ring. So you can use last semesters results to compute dimension. \end{remark} \section{Morphisms} \label{section-morphisms} \noindent An important question is, given a morphism $\... | {
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"lm_q2_score": 0.8198933315126792,
"openwebmath_perplexity": 120.73245969658541,
"openwebmath_score": 0.9982831478118896,
"tags"... |
quantum-field-theory, feynman-diagrams, integration, propagator
& = \lim_{\mu^2 \rightarrow 0} \int \frac{\operatorname{d}^4 p}{(2\pi)^4} \frac{\mathrm{e}^{-ip\cdot(x-y)}}{ \left(p^2 + m^2 - i\epsilon \right) \left(p^2 + m^2 + \mu^2 - i\epsilon \right) } \\
& = \lim_{\mu^2 \rightarrow 0} \int \frac{\operatorname{d}^4 ... | {
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"tags": "quantum-field-theory, feynman-diagrams, integration, propagator",
"url": null
} |
matlab, digital-communications, fading-channel
Title: i.i.d Raleigh distributed T tap frequency selective channel A Single-tap 'flat Raleigh fading channel' is implemented as.
N=length(X); % X is any signal
ray = sqrt(0.5*((randn(1,N)).^2+(randn(1,N)).^2));
Data_sent = X.*ray;
Is it a single path? What I have to ... | {
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"tags": "matlab, digital-communications, fading-channel",
"url": null
} |
gazebo, rviz, p3dx, dae, stl
Originally posted by cyborg-x1 with karma: 1376 on 2017-04-04
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by anirban on 2017-04-15:
Thank you for your reply. I got belnder 2.78c which can convert .stl file into .dae format. Unfortunately those con... | {
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"tags": "gazebo, rviz, p3dx, dae, stl",
"url": null
} |
visualization, tableau
Title: Sorting bar chart in Tableau by one category of bars I have a bar chart that looks like this (truncated for space, orange label obscured for privacy):
Right now, it is ordered by US state. The color distinction is for something called "Entity".
Here are the set ups for Marks, Columns, a... | {
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"tags": "visualization, tableau",
"url": null
} |
algorithms, sorting, mergesort
Title: Expected number of comparisons in a merge step? I know that merging two sorted arrays takes worst case n comparisons. However, there will often be cases where one array is depleted before the other, letting us just append the remainder of one array to the combined sorted array. I'... | {
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"tags": "algorithms, sorting, mergesort",
"url": null
} |
javascript, beginner, html
<INPUT TYPE="Checkbox" id="check_menu" onclick="calculate(this.form);" VALUE="0.65" />Nickel based anti-seize <br/>
<INPUT TYPE="Checkbox" id="check_menu" onclick="calculate(this.form);" VALUE="0.45" />Never-seize<br/>
<INPUT TYPE="Checkbox" id="check_menu" onclick="calculate(this.fo... | {
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"url": null
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• mathscinotes says:
Hi Hanna,
Let's take a quick look and see if I am thinking of your problem correctly. To keep things very simple, let's assume that your theodolite is 100 m above the ocean and you are observing something in the water at a 45 °C angle. Using "flat Earth" methods, your subject is 100 m away -- cor... | {
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"lm_q2_score": 0.8244619306896955,
"openwebmath_perplexity": 976.3513989086459,
"openwebmath_score": 0.6087819337844849,
"tags":... |
newtonian-mechanics, lagrangian-formalism
Title: Lagrangian dynamics with initial conditions: motion of free particle I am very new to Lagrangian dynamics so I am trying to get my head around the practical usage. So far on here all I could find were proofs and they did not make much sense to me, especially when time w... | {
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"tags": "newtonian-mechanics, lagrangian-formalism",
"url": null
} |
turing-machines
Title: Changing a complete undecidable turing machine language $L = \{\langle M\rangle\mid \text{M is a TM and }L(M) = \{101\}\}$ meaning M accepts only the string $101$. Which is neither co-recognizable / recognizable. Can be proven easily by $HALT \leq_m L (\text{ or } \bar{L})$ mapping reduction. Re... | {
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"tags": "turing-machines",
"url": null
} |
quantum-field-theory, operators, quantum-anomalies
There are many explanations of the physical interpretation of the operator insertions:
The asymptotic "out" vacuum state of an anomalous theory has a zero-mode ghost number charge due to the spectral flow. Please see Friedan, Martinec and Shenker page 111. The insert... | {
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"tags": "quantum-field-theory, operators, quantum-anomalies",
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filters, finite-impulse-response
Title: The transform function of a digital FIR filter The transform function of a digital FIR filter can be characterized by
$$
H(z) = \sum_{n=0}^{2N} h(n)z^{-n}\quad\text{where $2N$ is the order of the filter.}
$$
But when we use $2N$ or $N-1$ , $2N+1, \ldots$, on any basis chosen, i... | {
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"tags": "filters, finite-impulse-response",
"url": null
} |
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