text stringlengths 1 1.11k | source dict |
|---|---|
algorithms, greedy-algorithms
Then you iterate over the intervals, for each minute.
If you are at a point where more than $k$ intervals end the next minute, you cannot solve it.
Otherwise you remove the $k$ first intervals in your list, and increase the minute counter. | {
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"tags": "algorithms, greedy-algorithms",
"url": null
} |
ros, gazebo, rviz, urdf
<gazebo reference="h_right_wheel_2">
<kp>10000000.0</kp>
<kd>10000000.0</kd>
<mu1>10.0</mu1>
<mu2>10.0</mu2>
<material>Gazebo/Black</material>
</gazebo>
<joint name="joint_wheel_right_2" type="continuous">
<origin xyz="0.065 0.1 -0.05" rpy="0.0 1.5708 0.0" />
<parent link="... | {
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"openwebmath_score": null,
"tags": "ros, gazebo, rviz, urdf",
"url": null
} |
c#, git, libgit2sharp
return RunAnalysis(repoPath, options.BranchName);
}, _ => 1);
}
private static int RunAnalysis(string repositoryPath, string branchName)
{
try
{
using (var repo = new Repository(repositoryPath))
{
... | {
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"tags": "c#, git, libgit2sharp",
"url": null
} |
electrostatics, potential-energy, coulombs-law
Title: Total energy for 2 charged particles feeling their potentials: Problem with a factor of 2 Say we have charge $Q_1$ and charge $Q_2$, both exerting a potential $V_1$ and $V_2$ respectively, at a separation $r$.
The interaction energy is $\displaystyle\frac{Q_1 Q_2}{... | {
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"tags": "electrostatics, potential-energy, coulombs-law",
"url": null
} |
gazebo
<!-- rover -->
<include>
<uri>model://my_rover</uri>
</include>
Originally posted by peshala on Gazebo Answers with karma: 197 on 2013-05-20
Post score: 1
Original comments
Comment by peshala on 2013-05-20:
I am using gazebo 1.7.1
Comment by nkoenig on 2013-05-20:
Can you verify that your rover is c... | {
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"tags": "gazebo",
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} |
My favorite example of when this happens is when people say $\pi$ is transcendental because it's not solution of a polynomial equation. I usually point out
$$x-\pi$$ is a polynomial and then preach the importance of correctly qualifying expressions.
easiest is to take $\omega$ as a primitive seventh root of unity, any ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9603611608990299,
"lm_q1q2_score": 0.8023659376376951,
"lm_q2_score": 0.8354835350552603,
"openwebmath_perplexity": 182.33985902230944,
"openwebmath_score": 0.7954710721969604,
"ta... |
java, swing
// a few extra stats get factored in too
statPanel.addMappedFixedTF(0,6,"Stress", "",5,true);
statPanel.addMappedFixedTF(2,6,"MOX", "",5,true);
statPanel.addMappedFixedTF(4,6,"Credits", "",5,true);
statPanel.addMappedFixedTF(6,6,"Free CP", "",5,true);
statPanel.endRo... | {
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"tags": "java, swing",
"url": null
} |
c#, multithreading, concurrency, compression
#if x32
using uword = System.UInt32;
#else
using uword = System.UInt64;
#endif
namespace Pdf {
/* RFC 1951 compression ( https://www.ietf.org/rfc/rfc1951.txt ) aims to compress a stream of bytes using :
(1) LZ77 matching, where if an input sequences of at least 3 byte... | {
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"tags": "c#, multithreading, concurrency, compression",
"url": null
} |
python, python-2.x, recursion
class BinaryTree(object):
"""Structure to hold a binary tree, for starters based on letter nodes."""
# Next two variables are used as default for the traversal
# methods to indicate if left or right equal to None should
# yield the nil_marker value. This is needed in orde... | {
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"tags": "python, python-2.x, recursion",
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} |
in the amssymb package of angles Quiz and be... 1880 by John Venn, is the universal set, you ca n't give! Than sets denote the union of two sets set called “ A ” with elements 1,,. Setdiff and intersect, respectively, and it is used for the complement. Following figures give the set differences and c be Three sets as l... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.970687770944576,
"lm_q1q2_score": 0.821145984473582,
"lm_q2_score": 0.8459424431344438,
"openwebmath_perplexity": 478.71060939455475,
"openwebmath_score": 0.75237637758255,
"tag... |
angles of the a triangle is two right angles (i. (3) Perpendicular drawn to the third side from the corresponding vertex will bisect the third side. Isosceles Triangle. Isosceles triangle is a polygon with three vertices (corners) and three edges (sides) two of which are Given the properties of an isosceles triangle, s... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9852713861502773,
"lm_q1q2_score": 0.8354783668149235,
"lm_q2_score": 0.8479677564567912,
"openwebmath_perplexity": 394.92703066291256,
"openwebmath_score": 0.6327841281890869,
"tags":... |
ros, moveit, collision-object
try{
listener.lookupTransform("torso_base_link", "bin2", ros::Time(0), t_bin2);
}
catch (tf::TransformException ex){
ROS_WARN("%s",ex.what());
}
try{
listener.lookupTransform("torso_base_link", "bin3", ros::Time(0), t_bin3);
}
catch (tf... | {
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"tags": "ros, moveit, collision-object",
"url": null
} |
c++, beginner, reinventing-the-wheel, memory-management, stack
[3] One might wonder why pop() returns void, instead of value_type. That is, why must one use top() and pop() to examine and remove the top element, instead of combining the two in a single member function? In fact, there is a good reason for this design. ... | {
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"url": null
... |
python, apache-spark, pyspark, jupyter
Lastly, add the Spark symbolic link to the PATH:
export SPARK_HOME=~/Applications/spark
export PATH=$SPARK_HOME/bin:$PATH
You can now run Spark/PySpark locally: simply invoke spark-shell or pyspark.
Setting Jupyter
In order to use Spark from within a Jupyter notebook, prepand th... | {
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"url": null
} |
c++, windows, embedded
if (strcmp(menuString.c_str(), SysLatOpt.m_PortSpecifier.c_str()) == 0) {
MainMenu->CheckMenuItem(ID_COMPORT_START + m_COMPortCount, MF_CHECKED);
}
m_COMPortCount++;
}
else { //catch or throw errors here maybe?
... | {
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"tags": "c++, windows, embedded",
"url": null
} |
python, multithreading, json, socket, serial-port
# trnm_thr() sends commands to APM2.5
def trnm_thr():
global client_adr
msg = ""
try:
while pySerial.writable():
try:
# Wait for UDP packet from ground station
msg, client_adr = udp_sock.recvfrom(512)
except socket.timeout:
... | {
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"tags": "python, multithreading, json, socket, serial-port",
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} |
T1 = Travel time if Edwin drives alone
T2 = Travel time if Edwin and George drive together
E = Edwin’s Rate
G = George’s Rate
D = Distance of the trip
If Edwin travels alone: ET1 = D
If Edwin and George travel together: .5(E + G)T2 = D
(Since Edwin and George split the driving equally, the rate for the trip is equal ... | {
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"lm_q1q2_score": 0.816577212318569,
"lm_q2_score": 0.8354835330070839,
"openwebmath_perplexity": 752.6824713266565,
"openwebmath_score": 0.5903541445732117,
"tags": nu... |
java, game, parsing, gui, dice
//Set up action button panel
Box actionBox = Box.createHorizontalBox();
rollButton = new JButton("Roll");
clearButton = new JButton("Clear");
ActionListener buttonListener = new ButtonListener();
rollButton.addActionListener(buttonListener);
... | {
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"tags": "java, game, parsing, gui, dice",
"url": null
} |
ruby, ruby-on-rails
You have two (and probably more throughout the code) almost identical begin/rescue blocks. That's a call for abstraction (it this case an abstraction using block wrappers).
Don't write rescue Exception, that's a common pitfall. Check this SO question.
Shouldn't deliver! return something? how would ... | {
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"tags": "ruby, ruby-on-rails",
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} |
windows
-- ==> add_subdirectory(roscpp_core/roscpp_traits)
-- +++ processing catkin package: 'roscreate'
-- ==> add_subdirectory(ros/tools/roscreate)
-- skipping nosetests(test) in project 'roscreate'
-- +++ processing catkin package: 'rosgraph'
-- ==> add_subdirectory(ros_comm/tools/rosgraph)
-- skipping nosetests(te... | {
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} |
rotational-dynamics, torque
Thank you in advance. I can't see anything wrong with your reasoning, so I'd have to conclude that you're correct and the angular velocity is proportional to voltage.
However when you increase the load on the motor and slow it, the back EMF decreases and the motor draws more current from yo... | {
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} |
qiskit, simulation, vqe
I have two related bonus questions (I know each post should ideally be "laser-focused" but I think these questions are too related to warrant a separate post so please bear with me): | {
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the system x~0(t)=A~x(t) has general solution predicted by the eigenvalue-eigenvector method of c 1e 1t~v 1 + c 2e 2t~v 2 where the constants c 1 and c 2 can be determined from the initial values. A complex-valued square matrix A is normal ... As a special case, for every n × n real symmetric matrix, the eigenvalues ar... | {
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"lm_q1_score": 0.9678992932829917,
"lm_q1q2_score": 0.8493091516215903,
"lm_q2_score": 0.8774767762675405,
"openwebmath_perplexity": 326.5004848723243,
"openwebmath_score": 0.852203905582428,
"tags... |
sass
width: 300px;
}
.two-thirds.column {
width: 620px;
}
.offset-by-one {
padding-left: 60px;
}
.offset-by-two {
padding-left: 120px;
}
.offset-by-three {
padding-left: 180px;
}
.offset-by-four {
padding-left: 240px;
}
.offset-by-five {
... | {
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} |
java, object-oriented, multithreading, http, network-file-transfer
if (progress.ex == null) {
handler.handle(progress.mURLVerifyResult);
} else {
// Else print the error message and exit.
printErrorMessage(progress.ex);
}
}
}
Where the ProgressHandler is a simpl... | {
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"url": n... |
python, algorithm, python-3.x, mathematics, calculator
use
current_layer = [sum(pair) for pair in seperate_to_pairs(layer)]:
WET -vs- DRY
"WET" stands for "Write Everything Twice", and "DRY" for "Don't Repeat Yourself". You want your code do be "DRY"...
Data entry & input validation
You have a lot of duplicat... | {
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} |
linux, arm-cpu
See if your library comes precompiled for ARM7 already, as this asker wanted to know.
If you have enough memory and processor resources on your ARM7 machine, you can use WINE for ARM. Your ARM7 machine runs a Windows emulator, and you can run your x86 program inside the emulator.
Willing to run the pro... | {
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javascript, chat
translate();
setInterval(translate, 5000);
})(Function('return this')());
The idea is that the chat will be augmented, in a certain way, to add meanings to certain words or sentences.
Those will have a link and a descriptive title.
To run it, simply fire the console. Every 5 seconds, the chat w... | {
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ros, message, rosjava, publisher, topics
Original comments
Comment by dornhege on 2012-08-15:
Yes, use a callback signature that uses a Message Event.
Comment by dornhege on 2012-08-16:
Well, with java you'd have to look in the respective client API docs if something like that is supported. It looks like the MessageEv... | {
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c#, beginner
while (a <= int.MinValue + compareValue || b <= int.MinValue + compareValue)
{
if (a <= int.MinValue + compareValue)
{
b = AdjustVal(b, compareValue);
a++;
}
if (b <= int.MinValue + compareValue)
{
a = AdjustVal(a, compareValu... | {
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c++, gui
Yes, it is perfectly good. In fact, if something can be written using only the public interface, it should be written as a non-member.
Yes, functions used only in one CPP file should be static. In general, use an anonymous namespace for anything (including templates) used only in the one file.
Header
#inclu... | {
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newtonian-mechanics, rotational-dynamics, centripetal-force
Title: How fast will a ball travel if spun around with a string then released? It may seem like a stupid question, but I was wondering:
If a ball with a mass of 50 kg was rotated from a string with a radius of 10m and a velocity of 100 m/s how fast will it be... | {
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are used (as shown below). b) Show that the area of R is 1 (9 3 2) 16 − π. =𝑟sin𝜃 Objective: As an admiral, you fire shots at your opponent’s armada until you have completely obliterated their naval force. The formula for the area Aof a polar region Ris A= Z b a 1 2 [f( )]2 d = Z b a 1 2 r2 d : Caution: The fact that... | {
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"openwebmath_score": 0.9244123101234436,
"tag... |
digital-to-analog, delta-sigma
I also found the simple accumulator-overflow DAC reference here (page 71): https://github.com/hamsternz/IntroToSpartanFPGABook/blob/master/IntroToSpartanFPGABook.pdf
Thank you. This is just a first-order sigma delta DAC with the input as an unsigned binary number. The classical variant w... | {
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} |
search-algorithms, heaps, search-problem, binary-search
mid = (start + end)/2
index of mid = i/(2^(h- mid)) //(h-mid)^th ancestor of i
if (end-start = 1)
if (heap[index of mid] == x) return "YES"; otherwise "NO".
if (heap[index of mid] >= x)
return BinarySearch (start, mid)
else
return BinarySearch (mid+... | {
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np-complete, np-hard
There is no contradiction
NP-hard means that the problem is "harder than" all problems in NP.
We know that Circuit Sat is NP-complete. | {
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} |
machine-learning, datasets, data-preprocessing
If you have enough data
You can try using MICE (Multivariate Imputation By Chained Equations) algorithm on your missing data. The method is based on Fully Conditional Specification, where each incomplete variable is imputed by a separate model. The MICE algorithm can impu... | {
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"tags": "machine-learning, datasets, data-preprocessing",
"url": null
} |
ros, ros-kinetic, grasping
Originally posted by CharlieMAC on ROS Answers with karma: 28 on 2018-09-05
Post score: 0
Hello Charlie,
there is an error of about +- 10 mA.
We compared the current reading of the topic to the actual current between the handcontrolcircuit and single motors to get this value.
Originally po... | {
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"tags": "ros, ros-kinetic, grasping",
"url": null
} |
computational-chemistry, molecular-dynamics
You will get the total distance as well as x, y and z distances between your two molecules. The output file will contain 8 columns. The AMBER manual states that they are identified as follows:
Frame | x-Vector-Coordinate | y-Vector-Coordinate | z-Vector-Coordinate | x-Origin... | {
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"tags": "computational-chemistry, molecular-dynamics",
"url": null
} |
electrochemistry, experimental-chemistry
However there are also kinetic losses, at some small finite potential over the equilibrium potential one will find that the current is still approximately 0. This is because the rate of charge transfer (kinetics at the electrode) at the electrode-electrolyte interface is determ... | {
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"tags": "electrochemistry, experimental-chemistry",
"url": null
} |
Theorem 6
Given any set $M$ , let $\mathcal{M}$ be the set whose elements are all possible subsets of $M$ . Then the power of $\mathcal{M}$ is greater than the power of the original set $M$ .
Proof
Attempt to setup $X$ to be the set of elements of $M$ which do not belong to their ‘associated subsets’. Then we reach ... | {
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"lm_q2_score": 0.8152324938410784,
"openwebmath_perplexity": 258.8866947701661,
"openwebmath_score": 0.9702284932136536,... |
r, bioconductor
Title: CNSeg no method coercing S4 class to vector I'm attempting to analyze some genomic data with the help of a package called CNSeg. The package is located here and the documentation is here.
My input data looks like:
> str(segments)
'data.frame': 11897 obs. of 7 variables:
$ X :... | {
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} |
I first define the events:
A = I win
B = B wins
a) If you draw the first ball, what is the probability that you win given that B also wins?
We must be looking for the union P(A union B) = P (A) * P(B given A) = (12/18 * 11/17). Is this correct?
b) Is it a good deal for you to accept the offer from C, instead of just ... | {
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"lm_q2_score": 0.8311430415844384,
"openwebmath_perplexity": 454.6346135731354,
"openwebmath_score": 0.5472453832626343,
"... |
3. Hello, carriereg!
There are 104 people in the room.
State if the following statements are true or false and
a) Explain the reasoning if true.
b) If false, give a situation where the statement is not applicable.
. . .
This means provide a counter-example, proving the statement false.
1. There has to be at least two... | {
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"openwebmath_score": 0.3266051709651947,
"tags"... |
c#, object-oriented, design-patterns
return PersonToReturn;
}
private School GetSchool(School school)
{
School schoolToReturn = null;
//If the item is already in the cached list then use it rather than hitting the database again.
var cachedItem = _cachedSchools.FirstOrDefault(x =>... | {
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"tags": "c#, object-oriented, design-patterns",
"url": null
} |
gravity, string-theory, action, ads-cft, wess-zumino-witten
The action $(2)$ is easy to generalise to non-abelian semisimple Lie algebras, yielding the corresponding metric in the non-linear sigma model. In particular, choosing the (simple) Lie algebra $\mathfrak{sl}(2, \mathbb R)$ results in a non-linear sigma model ... | {
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"tags": "gravity, string-theory, action, ads-cft, wess-zumino-witten",
"url": null
} |
c++, vectors
//Output: -3
Solution Two fails to compare the values of the two vectors (A and V), as calculating the index with the above methods with a positive int doesn't work.
How can I get my Solution 2 to work with unordered vectors of negative ints?
How can I edit my Solution 2 to work with vectors of positive... | {
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"openwebmath_score": null,
"tags": "c++, vectors",
"url": null
} |
beginner, c, strings
char *strip(char *s)
{
/* * * * *
* Strip a string of a new line
* Example:
* strip("test\n");
* test
*/
return strtok(s, "\n");
}
static char *scramblePassword (char *pwd, char *result)
{
/* * * *
* Create a scrambled password
* Example:
*
... | {
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"openwebmath_score": null,
"tags": "beginner, c, strings",
"url": null
} |
c++, ros-kinetic, rosrun, cmake
Title: How to use GPU enabled OpenCV with ROS Kinetic?
Hi, I want to use CUDA enabled OpenCV with ROS. I have kinetic which already has one OpenCV 3.2 but it is not cuda enabled and also doesn't have extra modules of opencv_contrib. For this reason, I built a new OpenCV in /usr/local w... | {
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"openwebmath_score": null,
"tags": "c++, ros-kinetic, rosrun, cmake",
"url": null
} |
observational-astronomy, black-hole, data-analysis, accretion-discs, modeling
"Directness" is a very relative thing especially in astronomy. I think this measurement of misalignment is very interesting because each of the 4 angles required a different approach to estimate, and then they must all be statistically combi... | {
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"tags": "observational-astronomy, black-hole, data-analysis, accretion-discs, modeling",
... |
gazebo
Msg Connected to gazebo master @ http://localhost:11345
gzserver: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = gazebo::transport::Publisher]: Assertion `px != 0' failed.
Service call failed: transport error completing service call: unable to receive data... | {
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"openwebmath_score": null,
"tags": "gazebo",
"url": null
} |
genetics, genetic-linkage
The distance of a in the array is closer to b than k, ie A[0] is closer to A[1] than A[10] so that the centimorgan of A[0] and A[1] is less than A[0] and A[10]? I personally like to talk in Morgan (M), instead of centiMorgan (cM), because the Morgan has a more intuitive meaning than one-hundr... | {
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"openwebmath_score": null,
"tags": "genetics, genetic-linkage",
"url": null
} |
algorithms, information-theory, hash
https://crypto.stackexchange.com/q/17935/351
https://crypto.stackexchange.com/q/11420/351
the answers to https://crypto.stackexchange.com/q/1558/351 | {
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"openwebmath_score": null,
"tags": "algorithms, information-theory, hash",
"url": null
} |
python, performance, numpy, statistics
Make sure the data sits on local drives and not on a network share or USB stick or similar.
Make sure your disks are reasonably fast (SSDs might help).
Put your input file and your output file on two different hard drives.
mmap might gain you some speed in reading and/or writing ... | {
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"openwebmath_score": null,
"tags": "python, performance, numpy, statistics",
"url": null
} |
filters, filter-design, lowpass-filter, butterworth, damping
Title: How to derive 2nd order Butterworth condition for the damping coefficient mathematically? The magnitude of 2nd order low pass filter is given as
$$|H(\omega)|^2= \frac{1}{(1-(\frac{\omega}{\omega_o})^2)^2+(\frac{2\zeta\omega}{\omega_o})^2}$$
Now in or... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "filters, filter-design, lowpass-filter, butterworth, damping",
"url": null
} |
smoothing, c++
These spikes cause troubles in my controller. I would like to smooth this data more. What is an efficient approach for this problem and easily to be implemented in C++ on online process? I've included the actual data time actualVelocity estimatedVelocity below
2.994 69.2363 70.7967
2.995 71.4746 68.933... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "smoothing, c++",
"url": null
} |
quantum-mechanics, quantum-information, quantum-computer, linear-algebra
Title: Which set of basis states can a quantum system of qubits actually collapse to? I was watching a video on "How Does a Quantum Computer Work?".
I'm confused about what they mean by: "Although the qubits can exist in any combination of state... | {
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"url"... |
ros, ros-melodic, rosout, libroscpp, xmlrpc
Originally posted by ixil on ROS Answers with karma: 23 on 2019-11-06
Post score: 2
I am running the same setup and ran into the same problem but managed to fix it after creating a Debug build of the core ros libraries and analyzing the code of the XmlRpcServer where the ma... | {
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"tags": "ros, ros-melodic, rosout, libroscpp, xmlrpc",
"url": null
} |
c#, design-patterns
using (SqlCommand _cmd = new SqlCommand(sql, _con))
{
AttachParameters(_cmd, paramsToCommand);
using (SqlDataAdapter adapter = new SqlDataAdapter(_cmd))
{
adapter.Fill(ds);
}
... | {
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"openwebmath_score": null,
"tags": "c#, design-patterns",
"url": null
} |
each rectangle. (a) Use a midpoint Riemann sum with four subintervals of equal length and values from the table to approximate 40 0 ∫v t dt(). To estimate , the midpoint formula with slivers of equal width is:. Approximate ∫ f(x)dx using a left hand sum. Riemann Sums and Riemann Integral The Midpoint Rule described abo... | {
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"lm_q1_score": 0.9865717456528508,
"lm_q1q2_score": 0.8019519197982119,
"lm_q2_score": 0.8128673087708699,
"openwebmath_perplexity": 483.8687698821752,
"openwebmath_score": 0.8928297162055969,
... |
manufacturing-engineering, computer-engineering
The first computers were made in discrete parts. At first vacuum tubes, then transistors. Then the first integrated circuits that had only a couple dozen transistors and were based on manually projected stencils. The computers would help a bit, but most of the work was d... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "manufacturing-engineering, computer-engineering",
"url": null
} |
classical-mechanics, aerodynamics, propulsion
Title: Why does deflating baloon spurting through the air make circular motion? When you inflate a balloon and then let it go again, it will fly through the air in an unpredictable motion. My kids (1 and 3 year old) love watching this. At some point my oldest asked how it ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "classical-mechanics, aerodynamics, propulsion",
"url": null
} |
temperature, material-science, radiation
No, the temperature doesn;t even get near 400x that of earth. Thankfully. As far as I know, no material would remain solid at such a temperature.
I'm not sure what a death ray is
Do you mean to ask why the water does not evaporate? I know nothing about the engineering design ... | {
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"tags": "temperature, material-science, radiation",
"url": null
} |
2304703. #N#The exponent is written as a superscript. This makes it a useful format to use in Moodle, since it can be entered anywhere you can type text, from forum posts to quiz questions. Given the function f (x) as defined above, evaluate the function at the following values: x = -1, x = 3, and x = 1. For example, 9... | {
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"lm_q1_score": 0.9637799430946808,
"lm_q1q2_score": 0.8191851676446298,
"lm_q2_score": 0.8499711718571775,
"openwebmath_perplexity": 1037.5371453168518,
"openwebmath_score": 0.8853237628936768,
"ta... |
python, gui, tkinter
name), 'hg', 'update', '-C', '-R', path
)
else:
use_merge_dialog = False
if use_merge_dialog:
self.run_command(
'Launching merge dialog', 'thg', 'merge', '-R', path, '-r',
re... | {
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"openwebmath_score": null,
"tags": "python, gui, tkinter",
"url": null
} |
gazebo, ros-melodic, ubuntu, ubuntu-bionic
<node pkg="tf" type="static_transform_publisher" name="camera_link_broadcaster" args="0 0 0 -0.5 0.5 -0.5 0.5 /camera_link /camera_depth_optical_frame 20" />
<node pkg="tf" type="static_transform_publisher" name="base_footprint_broadcaster" args="0 0 0.1 0.0 0.0 0.0 1.0 /ba... | {
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"id": 32443,
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"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gazebo, ros-melodic, ubuntu, ubuntu-bionic",
"url": null
} |
13 2020 at 17:52): #### Patrick Thomas (Sep 13 2020 at 18:56): If a vector is based on a list, how do you use the functions defined for lists on it? Do you have to cast it to a list first? #### Kevin Buzzard (Sep 13 2020 at 18:57): A vector is a pair consisting of a list and a proof. #### Patrick Thomas (Sep 13 2020 at... | {
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"openwebmath_perplexity": 3348.954673009072,
"openwebmath_score": 0.3846169710159302,
"tags": ... |
c#, object-oriented, interview-questions, chess
public class Rook : ChessPiece
{
public Rook(Position poisition)
: base(poisition, PieceType.Rook)
{
}
public override bool IsValidMove(Position dest)
{
if (!IsOnBoard(this.Position, dest))
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, object-oriented, interview-questions, chess",
"url": null
} |
kotlin
availablePlayers.shuffle()
val teams = availablePlayers.chunked(if (availablePlayers.size % 2 == 0) (availablePlayers.size / 2) else (availablePlayers.size / 2) + 1)
if (goalkeepers.size >= 2) {
teamA.add(goalkeepers[0])
teamB.add(goalkeepers[1])
}
teamA.addAll(teams[0])
te... | {
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"openwebmath_score": null,
"tags": "kotlin",
"url": null
} |
java, console, calculator, finance
TaxBracket(double minSalary, double maxSalary, double taxRate) {
this.minSalary = minSalary;
this.maxSalary = maxSalary;
this.taxRate = taxRate;
}
}
//This is the data structure which holds the values for each tier of each filing st... | {
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"openwebmath_score": null,
"tags": "java, console, calculator, finance",
"url": null
} |
fermions, chirality
Title: Electron indistintinguishability and handedness I just learned that right ad left handed electrons behave in a remarkably different way under the weak interaction.
Up till now I have been told that all the electrons are exact copies of one another and all this fermi-dirac statistics story.... | {
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"openwebmath_score": null,
"tags": "fermions, chirality",
"url": null
} |
subspace of R 3 2018 by Vikash Kumar from Chapter 6.3: a with... Is equal, then the matrix a = 1/2 1/3 1/2 2/3 # a! Are only interested in a two-dimensional grid used to store only those elements rectangular.., but how far will be enough one-column matrix is called a ___ matrix of the template. More generally, a one-co... | {
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"lm_q1_score": 0.9196425311777929,
"lm_q1q2_score": 0.8187524382807376,
"lm_q2_score": 0.8902942290328345,
"openwebmath_perplexity": 562.3483628334952,
"openwebmath_score": 0.5319056510925293,
"tags": n... |
homework-and-exercises, newtonian-mechanics, newtonian-gravity, torque
$$\vec \tau = \int {d\vec \tau } = \int {(\vec r \times dm\vec g)} = \left( {\int {\vec r dm} } \right) \times \vec g$$
where I have used the assumption that near the earth $\vec g$ is constant. Now according to the definition of center of mass w... | {
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"tags": "homework-and-exercises, newtonian-mechanics, newtonian-gravity, torque",
"url": ... |
optics, laser, fourier-transform
I learned this through trial and error as well, after a few wavelengths the numerical model really begins to behave poorly, probably due to aliasing and roundoff error.
The Fresnel approximation actually does a better job if you are anywhere further than the very near field region, it... | {
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"openwebmath_score": null,
"tags": "optics, laser, fourier-transform",
"url": null
} |
deep-learning, tensorflow
Title: How to calculate the mini-batch memory impact when training deep learning models? I'm trying to calculate the amount of memory needed by a GPU to train my model based on this notes from Andrej Karphaty.
My network has 532,752 activations and 19,072,984 parameters (weights and biases). ... | {
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"id": 3148,
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"openwebmath_score": null,
"tags": "deep-learning, tensorflow",
"url": null
} |
python, numpy, statistics, simulation, matplotlib
for n in range(1, options.num_of_sims + 1):
plot(n)
if __name__ == "__main__":
main()
options.py
import argparse
class Options:
options = None
@staticmethod
def generate_options():
arg_parser = argparse.ArgumentParser()
arg_... | {
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"id": 33870,
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"tags": "python, numpy, statistics, simulation, matplotlib",
"url": null
} |
algorithms, graphs, modelling
You could also compute feature vectors using a bag-of-words model on the words in the essays, and use the L2 distance between these feature vectors (with features normalized using tf-idf) as another factor in the distance function. You might use a distance function that is a weighted aver... | {
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"id": 2058,
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"tags": "algorithms, graphs, modelling",
"url": null
} |
that a positive moment will result in a compressive. You will find the graphics in Figure 10. The radius of gyration can be useful for listing in a table. The method has been developed to evaluate the variable mass moment of inertia of a 12-cylinder V-engine having a piston–crank mechanism with main and auxiliary conne... | {
"domain": "everwoodbiocostruzioni.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.985271388745168,
"lm_q1q2_score": 0.8432456481315765,
"lm_q2_score": 0.8558511469672594,
"openwebmath_perplexity": 466.01335969356194,
"openwebmath_score": 0.6785146594047546... |
python, programming-challenge, tree, palindrome
The code takes a whopping 1500 ms to run on Leetcode and uses around 150 MB of storage! I think about ~200 test cases are run in the background. Running the code on a single tree (of different sizes) makes the code run in about ~30-40ms.
Should I be concerned? Are the ot... | {
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"tags": "python, programming-challenge, tree, palindrome",
"url": null
} |
described by the Dutch computer scientist Edsger W. Dijkstra in 1959. By making minor modifications in the actual algorithm, the shortest paths can be easily obtained. Il permet, par exemple, de déterminer un plus court chemin pour se rendre d'une ville à une autre connaissant le réseau routier d'une région. c) a-c-d-e... | {
"domain": "co.uk",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9669140225647108,
"lm_q1q2_score": 0.8099064842077138,
"lm_q2_score": 0.8376199592797929,
"openwebmath_perplexity": 1429.7884521328297,
"openwebmath_score": 0.37691807746887207,
"tags": nu... |
The key idea is that if you list the 36 possible outcomes of two distinguishable dice, you are listing equally probable outcomes. This is not obvious, or axiomatic; it's true only if your dice are fair and not somehow connected. If you list the outcomes of indistinguishable dice, they are not equally probable, because ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9867771786365549,
"lm_q1q2_score": 0.8445343783231644,
"lm_q2_score": 0.8558511451289038,
"openwebmath_perplexity": 220.2446653340933,
"openwebmath_score": 0.944078266620636,
"tags... |
quantum-field-theory, correlation-functions, propagator, 1pi-effective-action, feynman-diagrams
The connection of truncated functions with $S$-matrix elements is found by nothing that, near the pole of the propagator $p^2\approx m^2$: $$\Delta'(p^2)^{-1}\approx iZ^{-1}(p^2-m^2).$$
A glance to the LSZ formulas shows th... | {
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"id": 37267,
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"tags": "quantum-field-theory, correlation-functions, propagator, 1pi-effective-action, fey... |
for matrix addition, scalar multiplication, transposition, and matrix multiplication. For any whole number n, there is a corresponding n×nidentity matrix. Also, determine the identity matrix I of the same order. Lemma. for a square nxn matrix A the following statements are equivalent: a. Generally, it represents a coll... | {
"domain": "toddeachus.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9814534333179649,
"lm_q1q2_score": 0.8692060447080225,
"lm_q2_score": 0.8856314677809303,
"openwebmath_perplexity": 477.72901724713626,
"openwebmath_score": 0.7719961404800415,
"tags"... |
curvature, covariance, berry-pancharatnam-phase
$$with\ A_\mu=i\langle n| \partial_\mu |n\rangle$$
But, written out explicitly, this gives
$$D_\mu|n\rangle=\partial_\mu|n\rangle-\langle n| \partial_\mu |n\rangle|n\rangle$$
which means that the covariant derivative acting on the state $|n\rangle$ is its "usual" derivat... | {
"domain": "physics.stackexchange",
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"tags": "curvature, covariance, berry-pancharatnam-phase",
"url": null
} |
physical-chemistry, ionic-compounds
where $\beta = K/c_T$. As $c_T \rightarrow 0$ it follows from this last expression that $\alpha \rightarrow 1$ #QED
PS The following equation (from Wikipedia's page on Ostwald's law of dilution) $$\alpha=\sqrt{\frac{K}{c_T}} \tag{2}$$ does not hold over the entire concentration ran... | {
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"id": 12858,
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"tags": "physical-chemistry, ionic-compounds",
"url": null
} |
python, python-3.x
collated_votes[vote['district']][bout['match']][candidate['candidate']][candidate['ranking']] += 1
else:
collated_votes[vote['district']][bout['match']][candidate['candidate']][candidate['ranking']] = 1
else:
... | {
"domain": "codereview.stackexchange",
"id": 28545,
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"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
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"tags": "python, python-3.x",
"url": null
} |
• Rearrange as to leave the square root on one side, then square the equation. You'll get a quadratic in $x^2$. – dxiv Dec 18 '17 at 18:22
• you will get $y$ in the discriminant then, is that what you meant? – Codelearner777 Dec 18 '17 at 18:26
• Right. I assume you want to solve for $x$ since the question says end up ... | {
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"lm_q1q2_score": 0.8471046332789409,
"lm_q2_score": 0.8577681049901037,
"openwebmath_perplexity": 262.5634336433085,
"openwebmath_score": 0.8525114059448242,
"tag... |
4 billion in taxes in its most recent fiscal year, and said Microsoft's tax rate was in the middle third of companies in the S&P 500. 29 December, 2007 Countercurrents. For example, for a deck of cards n=52. 9 million in 2012. one sexdecillion x one quintillion = one. Users may use any other word by changing the word "... | {
"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... |
java, game, swing, collision
public void jump(){
velY = -20;
}
public void move(){
if(isAlive) {
y += velY;
fall();
checkCollision();
}
}
public void checkCollision(){
int bX = x + w / 2; //x of the middle bottom of the player
... | {
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"openwebmath_score": null,
"tags": "java, game, swing, collision",
"url": null
} |
kinetics, enzyme-kinetics
Title: Michaelis-Menten rate law for enzyme which catalyzes two reactions: steady state? Suppose an enzyme $\ce{E}$ can catalyze two reactions:
\begin{align}
\ce{S1 + E &<=> S1E -> P1 + E} \tag{R1} \\
\ce{S2 + E &<=> S2E -> P2 + E} \tag{R2}
\end{align}
I want to derive a rate law. Can I ass... | {
"domain": "chemistry.stackexchange",
"id": 12374,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "kinetics, enzyme-kinetics",
"url": null
} |
optics, visible-light, electric-fields, non-linear-systems
Title: Non-linear optics, non-linear polarization reference system? in the Boyd's book about non-linear optics he defines the non-linear polarization for sum frequency generation, under particular symmetries, as
$$
\left[\begin{array}{c}
P_{x}(2 \omega) \\
P_{... | {
"domain": "physics.stackexchange",
"id": 99237,
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"openwebmath_score": null,
"tags": "optics, visible-light, electric-fields, non-linear-systems",
"url": null
} |
It helps a lot in problems like this to draw a picture - that way you learn about how to connect what you are given, with what you need to find. E.g. In this problem if you draw a sketch:
You'll see you have a right triangle where you are at one vertex, the balloon at another, and the the point on the ground directly ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9715639661317859,
"lm_q1q2_score": 0.8178874646351914,
"lm_q2_score": 0.8418256472515683,
"openwebmath_perplexity": 299.0268397796705,
"openwebmath_score": 0.8611719608306885,
... |
regression, feature-selection, linear-regression, feature-extraction, feature-engineering
Title: Why is duplicating inputs bad? I am trying to predict an output value based on several continuously-valued inputs using a regression model.
I am not sure what approach is appropriate to scale/transform the input data for t... | {
"domain": "datascience.stackexchange",
"id": 1869,
"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": "regression, feature-selection, linear-regression, feature-extraction, feature-e... |
energy, statistical-mechanics, ising-model, lattice-model
Thanks for your time. Yes the minimum energy should be negative. No you shouldn't ignore the negative eigenvalues.
Take the negative eigenvector of $\sigma^x$ at each lattice site (assuming $\lambda$ is positive, otherwise take the positive eigenvector) and ca... | {
"domain": "physics.stackexchange",
"id": 47108,
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"openwebmath_score": null,
"tags": "energy, statistical-mechanics, ising-model, lattice-model",
"url": null
} |
the related Maclaurin expansion discussed below, are used in approximations. Power Series, Taylor and Maclaurin Polynomials and Series Power Series The Basics De nition 1 (Power Series). Notice that this Taylor Series for e x e^{x} e x is different from the Maclaurin Series for e x e^{x} e x. If you want to use a differ... | {
"domain": "timstourenblog.de",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9938070091084549,
"lm_q1q2_score": 0.8634461298002867,
"lm_q2_score": 0.8688267660487572,
"openwebmath_perplexity": 390.82097345168205,
"openwebmath_score": 0.9073213934898376,
... |
image-processing, matlab, convolution
So in summary we see by including step (or "T" as in my figure) we produce results that are consistent with time (in seconds) regardless of the sampling rate. It is more common to work in units of samples (not seconds) and know that the system will scale along with the sampling ra... | {
"domain": "dsp.stackexchange",
"id": 7468,
"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": "image-processing, matlab, convolution",
"url": null
} |
finite-automata
return DFA(
Q=set(labels.values()),
Sigma=dfa.Sigma,
delta=delta,
q_0=labels[dfa.q_0],
F={labels[q] for q in dfa.F},
)
def renumber_labels(labels):
label_numbers = {}
for label in labels.values():
label_numbers.setdefault(label, len(label_num... | {
"domain": "cs.stackexchange",
"id": 20313,
"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": "finite-automata",
"url": null
} |
\left\{c\right\}\right\}$$. Let x ∈ A− B. With this being the case, we saw that the element of each set resulted in a subgroup. You can find more examples of proof writing in the Study Help category for mathematical reasoning. Relevance. We now need to show the other direction. A set is a subset of $$A \cap B$$ if it i... | {
"domain": "barbaramitterer.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.975576912786245,
"lm_q1q2_score": 0.8714920415272305,
"lm_q2_score": 0.8933094152856196,
"openwebmath_perplexity": 297.98164227019214,
"openwebmath_score": 0.75785231590271,
... |
statistical-mechanics, phase-transition, condensation
someone please help me. I have the section of the paper for reference. I thank all helpers. Consider a cube with side length $a$. Then its perimeter is proportional to $a$, its surface area $A$ is proportional to $a^2$, and its volume $V$ is proportional to $a^3$. | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "statistical-mechanics, phase-transition, condensation",
"url": null
} |
c++, c++11, unit-testing
Title: CppUnit test suite for testing a routine I wrote a CppUnit test suite to unit-test the code that I posted here which is a single routine that proposes how a Lua expression could be auto-completed.
What do you think? I appreciate all the comments.
#include <boost/format.hpp>
#include <cp... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, c++11, unit-testing",
"url": null
} |
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