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ros, syncronization, rostime, transform
Originally posted by Lorenzo Riano on ROS Answers with karma: 1342 on 2011-03-03
Post score: 1
If synchronization between different contributing machines is off, this can generally cause a lot of problems with tf. The recommendation is to use chrony (http://chrony.tuxfamily.org... | {
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python, performance, algorithm, recursion, binary-search
print(binary_search([x for x in range(1, 10000)], 8))
# prints the index of the num if found, 7 A function's calls must be consistent with its implementation. The search()
helper function is organized to return -1 under some conditions. However,
nowhere do you c... | {
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python, performance, python-2.x, iterator, iteration
sys.stdout.write("\rCalculating real schedules: {:.2f}% ".format(float(pools.index(pooly))/(len(pools)-1) *100))
for prod in result:
yield tuple(prod)
When using the same classes as the previous answer, it took this code:
NEW:
Time to calculate a... | {
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-
The "vertical" part is throwing me off. If you want to make 11 pieces, shouldn't you necessarily make slant cuts? – Srivatsan Sep 2 '11 at 20:09
@Srivatsan: I think this is just to avoid "cute" answers. For example, to cut a cylindrical cake into 8 identical pieces with 3 cuts, cut along a diameter of the circular f... | {
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newtonian-mechanics, forces, work, potential-energy
To solve a mechanics problem, it is essential to carefully define your system. How you decide what is inside the system and what is outside doesn't matter, you'll get the same answer regardless of where you define the boundary between system and environment. After ... | {
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$$\frac{\mathrm d^n}{\mathrm dx^n}\frac{1}{1+x} = \frac{(-1)^n n!}{(1+x)^{n+1}}$$
$$\frac{\mathrm d^{n+1}}{\mathrm dx^{n+1}}f(x)= \frac{\mathrm d}{\mathrm dx}\left( \frac{\mathrm d^n}{\mathrm dx^n}f(x)\right) \quad \forall n \ge 0$$
You inductive hypothesis is that $$\frac{d^nf}{dx^n}=\frac{(-1)^nn!}{(1+x)^{n+1}}.$$
Yo... | {
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makes sense for non- finite dimensional vector spaces such as sequence spaces and Lebesgue spaces, making them into normed. Prove the following lemma: (Norm in the Inner Product Space) If X a vector space with the inner product (-:-), then |||x| =(x,y), XE X Define a norm in X. Minimum Norm Solutions of Underdetermined... | {
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"lm_q2_score": 0.8418256532040707,
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"openwebmath_score": 0.9124736785888672,
"tags": n... |
ros2, ros-humble, micro-ros
[1704199502.857303] info | ProxyClient.cpp | create_publisher | publisher created | client_key: 0x176AC30B, publisher_id: 0x001(3), participant_id: 0x000(1)
[1704199502.857844] info | ProxyClient.cpp | create_datawriter | datawriter created | client_key... | {
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"tags": "ros2, ros-humble, micro-ros",
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history
we still talk of AI as a unified, coherent field of study
Despite recent efforts in AGI, I don't think that AI is actually a very unified or coherent field. This is not necessarily a bad thing - when attempting to mimic the most complex phenomenon known to us (i.e. human intelligence) then multiple, sometimes... | {
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electromagnetism, special-relativity, education, maxwell-equations, vector-fields
Any accurate assessment of the above model requires explicit use of the modern version vector based version of Maxwell's equations. However, Maxwell was also fascinated by and made extensive conceptual use of hydrodynamic-inspired models... | {
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The continuous version turns out to be easier to analyse. To begin with, it’s equivalent to picking uniformly distributed, independent ${y_n\in [0,1]}$ and letting ${x_n = y_0y_1\cdots y_n}$. Then the sum is
${\displaystyle y_0+y_0y_1 + y_0y_1y_2 + \cdots }$
which can be written as
${\displaystyle y_0(1+y_1(1+y_2(1+... | {
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"tags":... |
c++, algorithm, sorting
#include <algorithm>
#include <iostream>
#include <iterator>
#include <type_traits>
namespace net {
namespace coderodde {
namespace sorting {
template<typename Iter>
void sort_impl(Iter begin, Iter end, std::true_type)
{
using ... | {
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classical-mechanics, kinematics, computational-physics
Title: Calculate local linear accelerations from trajectory I'm trying to simulate linear accelerations and angular velocity of a vehicle which drives on a flat surface. For this, I want to use a trajectory consisting of position ($x_i, y_i$) and orientation $\the... | {
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"tags": "classical-mechanics, kinematics, computational-physics",
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fft, frequency-spectrum, phase, amplitude, magnitude
You can see that there are peaks correctly at $\pm 3\;\textrm{Hz}$, matching exactly your input signal (remember the sin wave is actually a sum of complex exponentials).
-- Note that in signal processing, the "energy" is defined as [signal squared multipled by time]... | {
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"tags": "fft, frequency-spectrum, phase, amplitude, magnitude",
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physical-chemistry, thermodynamics, isotherm
Now here, things are different. The gas is not allowed to expand with its total power against a constant external pressure. Rather, there is an external gas, whose pressure is allowed to lower slowly, allowing the gast to undergo several differential steps of expansion agai... | {
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plot(x,y) #Rule 0, really. Always check your data.
#### Rule 3: After definitions begin your second stage of work. Probably trimming existing data, etc. Do these in the order they were added.
hat_b_1<-sum( (x-mean(x)) * (y-mean(y)) ) / sum( (x-mean(x))^2 ) #Spaces between any parenthesized section of operations. We ne... | {
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transition-metals, electronic-configuration, valence-bond-theory, magnetism
Whereas for Co$^{2+}$ the following applies:
S(Co$^{2+}$)=3/2
L(Co$^{2+}$)=3
J(Co$^{2+}$)=L+S (since more than half filled, per Hund's rule #3)=3+3/2=9/2
To calculate the magnetic moment one would also need to calculate $g_J$. Higher values ... | {
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... |
thermodynamics, energy, ions, enthalpy, ionic-compounds
Do these two explanations relate in any way? What would be the best explanation? Think about Coulomb's inverse-square law:
$$F = k\frac{q_1q_2}{r^2},$$
where $q$ is the magnitude of the charge, $r$ is the distance, and $k$ is the Coulomb’s constant.
Mathematicall... | {
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"tags": "thermodynamics, energy, ions, enthalpy, ionic-compounds",
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# Is my proof correct for: $\sqrt[7]{7!} < \sqrt[8]{8!}$
I have to show that
$$\sqrt[7]{7!} < \sqrt[8]{8!}$$
and I did the following steps
\begin{align} \sqrt[7]{7!} &< \sqrt[8]{8!} \\ (7!)^{(1/7)} &< (8!)^{(1/8)} \\ (7!)^{(1/7)} - (8!)^{(1/8)} &< 0 \\ (7!)^{(8/56)} - (8!)^{7/56} &< 0 \\ (8!)^{7/56} \left(\left( \f... | {
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"lm_q2_score": 0.8128673223709251,
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"openwebmath_score": 0.9999943971633911,
"ta... |
organic-chemistry, spectroscopy, carbonyl-compounds
Our 'assignment' is basically to figure out if it's supposed to be lower or higher than an unconjugated carbonyl.
Thanks in advance! It would shift the IR peak to lower wavenumbers. You can rationalise this by understanding the bonding in the carbonyl group; in essen... | {
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ros, ros-kinetic
Originally posted by maartenvds on ROS Answers with karma: 1 on 2018-02-23
Post score: 0
Original comments
Comment by rt_ros on 2020-09-23:
Hi, incase if you had found the ans, it will useful if you could share it.
As part of initialising ROS using ros::init(..), roscpp starts a couple of threads wh... | {
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c++, performance, signal-processing
The C++ Core Guidelines, maintained by Bjarne Stroustrup and Herb Sutter, say to avoid non-const global variables.
The Google C++ Style Guide forbids objects with static storage duration unless they are trivially destructable, and also discourages static storage duration if the obje... | {
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# solve the following system of linear equation by substitution by first isolating $x$?
Here's what I was given:
$x$ + $y$ = 9
-10$x$ + 6$y$ = 6
Firstly, in order to isolate $x$, I changed the first line so that $y$ would equal the equation and I got:
$x$ - 9 = -$y$
In the second equation, I replaced $y$ with $x$... | {
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$\int{\sin{(x)}d(\sin{(x)}})$
-see? Pretty clever, eh?
And yes you do end up with $\frac{t^2}{2}+C$, or, $\frac{1}{2}\sin^2{x}+C$.
P.S.
If you wonder why he did it, sometimes in problems its easy to see. If you notice, the stuff after $d$ is just the stuff he took out - integrated. This is so that to undo the $d"st... | {
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"openwebmath_score": 0.9907634258270264,
"tags... |
reinforcement-learning, sutton-barto, value-iteration, discount-factor, frozen-lake
how to interpret and choose the discount factor for any use case?
The discount factor is not a free choice for the agent, and it is not a hyperparameter for the learning method in value iteration. Instead, it is part of the definion f... | {
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... |
javascript, html
// Helper function to reset after game end
function reset() {
playerScore.innerHTML = "Your score is: 0";
computerScore.innerHTML = "The computer score is: 0";
tieText.innerHTML = "Tie rounds: 0";
}
```
Constants
The first thing to look at is the use of strings to represent the signs. The... | {
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quantum-mechanics, quantum-information
This is because the matrix you've shown is meant to represent transformation on single qubit, and you are trying to apply it to two qubit system.
What you are probably looking for is how to apply the transformation to get the state of $(|00\rangle+|10\rangle)/\sqrt{2}$. You can d... | {
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java, algorithm, array, binary-search, mathematics
Returning an Integer is weird, especially since the inputs are unboxed ints. I know, you want to be able to return null if no suitable element is found. I have another suggestion: return the index of the element found rather than the element itself; if no suitable e... | {
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c++, beginner, game
Title: C++ game with splash screen and menus As of now this game only consists of:
Splash Screen
MainMenu
SubMenus
Did I apply bad practices, or did I do something well? Is there a better way to do it?
#include <iostream>
#include <fstream>///filestream lib-- needed for file i/o
#include <windows... | {
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kinetics, temperature
We can see in the below equation the relation of the van't Hoff rule coefficient and the reaction activation energy:
$$C = \frac{ \exp{(- \frac{{E_\mathrm{a}}}{{R(T+\Delta T)}}})}{\exp{(- \frac{{E_\mathrm{a}}}{{RT}}} )}=\exp{\left(\frac{E_\mathrm{a}}{RT} - \frac{E_\mathrm{a}}{R(T+\Delta T)}\right... | {
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"tags": "kinetics, temperature",
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general-relativity, spacetime, curvature
Question#2:
Analogy of this to the rings of Saturn. In 4D they would look straight? Since they are just orbitals of rocks around Saturn. There orbitals would look like a straight line in 4D? But if that is true, then they must be allocated along a section only, since it is a fi... | {
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performance, c, strings
Then remove the entire section where you scan the input for all charges in remove. And replace found with remove_lut[*((unsigned char*)str)] == true.
This should give you a speed up of a factor \$O(len(remove))\$.
Also as was previously pointed out, your code is not really in-place... Typically... | {
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clojure, sorting, mergesort
Title: Mergesort implementation in Clojure (defn merge [pred left right]
(loop [v [] l left r right] ; v is a vector, so conj will append to the end
(if (and (seq l) (seq r)) ; if both left and right are not empty
(if (pred (first l) (first r))
(rec... | {
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java, optimization, algorithm, combinatorics, integer
What do all these have in common? They all can make the value 5 in there some where. 11 + 4 (= 15) + 3 + 2 (= 5).
So, what do I want to say with this?
Once you have calculated the possible partitions for the value of 5, reuse them!
To accomplish this you can use a ... | {
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# Pyth, 1614 13 bytes
-F_m{P/^Td9SQ
As best I can tell, 19 takes forever.
-F_m{P/^Td9SQ Implicit: Q = input
SQ Inclusive range 1 to Q
Implicit lambda d:
{P unique primes dividing
^Td 10**d
/ 9 //9
m map lambda over the range
m{P/^Td9SQ Un... | {
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"lm_q2_score": 0.8479677526147223,
"openwebmath_perplexity": 2306.721573618036,
"openwebmath_score": 0.3773219883441925,
"tag... |
c, beginner, parsing, library
}
/* free the buffer */
free(buf);
/* close the filestream */
fclose(bookFile);
return 0;
}
/*********************************************
* Function: printBookList()
*
* Description: Print the Array of books to the console
*
* Parameters: none
*
* Return par... | {
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"tags": "c, beginner, parsing, library",
"url": null
} |
ros, slam, navigation, rosdep-install, rgbdslamv2
Originally posted by Felix Endres with karma: 6468 on 2016-02-04
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by jacksonkr_ on 2016-02-06:
I set siftgpu_disable_devil = 0 in SiftGPU/makefile and set(ENV{SIFT_GPU_MODE} 0) in CM... | {
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"tags": "ros, slam, navigation, rosdep-install, rgbdslamv2",
"url": null
} |
ros, gazebo, octomap, ros-kinetic, octomap-server
a pdf file will be created in the same directory that you executed above command
Edit;
attaching sensors directly into world file of gazebo is not recommended. The sensors should be attached to body of file(URDF) of robot(drone in this case), and then the this URDF fil... | {
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"tags": "ros, gazebo, octomap, ros-kinetic, octomap-server",
"url": null
} |
human-genetics, skin, pigmentation
Population studies have shown that the three main ethnic subgroups (west-africans, asians and europeans) have developed independently from a common ancestor with different (and independent) mutations in each arm. See the figure from reference 1 as an illustration, it also shows the g... | {
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"tags": "human-genetics, skin, pigmentation",
"url": null
} |
c#, mysql, winforms
Months.DataSource = new BindingSource(allOptions, null);
Months.DisplayMember = "Value";
Months.ValueMember = "Key";
}
public void RefreshGrid()
{
string value = "";
// Select All
if(Months.SelectedIndex == 0)
{
value = "";
}
// Select * from January
i... | {
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"openwebmath_score": null,
"tags": "c#, mysql, winforms",
"url": null
} |
mysql, bash, configuration
--focus-field=1 --center --window-icon="preferences-system" --width=600 \
"${config[subdomain]}" "${config[domain]}" "${config[webmaster]}" "${config[webgroup]}" \
"${config[webroot]}" "test" "${config[virtualhost]}" "${config[virtualport]}" \
"${config[serveradmin]}" true \
... | {
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"openwebmath_score": null,
"tags": "mysql, bash, configuration",
"url": null
} |
electromagnetism, electricity, electric-fields
Title: Conceptually, why does an electric field not require a charge flowing through it? My son has been asking me a lot about electromagnetism and so I got to read up on it.One of the interesting and hard to grasp (for me at least) concepts is that an electric field will... | {
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"openwebmath_score": null,
"tags": "electromagnetism, electricity, electric-fields",
"url": null
} |
visible-light, plasma-physics, photon-emission
Title: What determines the color of the light emitted in a Tokamak? We see images of Tokamak plasma with all sorts of colours from red to purple. Why do we see any light at all, since the plasma should be so hot to have dissociated all its electrons? It is all from contam... | {
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"tags": "visible-light, plasma-physics, photon-emission",
"url": null
} |
# Welcome to the LEAP Q&A Forum
Find your questions answered. Here.
## GMAT - Problem Solving - Geometry
LEAP Administrator 11 months ago
### The figure shown above represents a modern painting that consists of four differently colored rectangles, each of which has length l and width w. (more)
The figure shown abo... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.990587412635403,
"lm_q1q2_score": 0.8167016064657672,
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"openwebmath_perplexity": 1316.9897753805071,
"openwebmath_score": 0.6059476137161255,
"tags": nul... |
$\displaystyle S = \frac{g\cdot \left( 1+r+r^2+...+r^{N-1} \right)}{\left( 1-r^N \right)}$
$\displaystyle S = \frac{g\cdot \left( 1+r+r^2+...+r^{N-1} \right) }{(1-r) \cdot \left( 1+r+r^2+...+r^{N-1} \right)} = \frac{g}{1-r}$
In the end, K helped me see there wasn’t just my stock approach to an infinite geometric sum,... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9907319878505035,
"lm_q1q2_score": 0.8962662254973889,
"lm_q2_score": 0.9046505376715775,
"openwebmath_perplexity": 980.6773426566747,
"openwebmath_score": 0.803494930267334,
"tags": n... |
performance, vba, excel
Title: Searching for an empty row in a given destination It simply searches for an empty row in a given destination. If it is empty, it performs certain actions (copying, pasting, etc.). If it is not empty, it goes to another row. I managed to do it with dozens of If formulas, but doing it in... | {
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"tags": "performance, vba, excel",
"url": null
} |
ros, gazebo, nvidia
Original comments
Comment by Loy on 2012-06-13:
Yep, it has Optimus, with a sticker promising great battery life and great performance. I don't care for the battery life and the performance isn't that great, to say the least.
Comment by Loy on 2012-06-13:
How do I check if the NVidia-card is being ... | {
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"tags": "ros, gazebo, nvidia",
"url": null
} |
astrophysics, meteors
As a 2nd sidebar, if it breaks apart flying inside the Roche Limit, like Comet Shoemaker-Levy did flying around Jupiter before impact, then the impacting pieces can spread across much of the earth, but that's not possible with an atmospheric break-up.
(Corrections welcome, as I'm a hobbyist, no... | {
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"openwebmath_score": null,
"tags": "astrophysics, meteors",
"url": null
} |
ros, rqt-reconfigure, ros-kinetic, rqt
Title: rqt_reconfigure window is totally empty
Hi,
rqt_reconfigure looks working badly on my computer. It shows a totally empty window. It is showing no parameter, no grid, and no command window. Nothing.
I was trying to reconfigure the parameter of the pointgray camera. Cuttin... | {
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"tags": "ros, rqt-reconfigure, ros-kinetic, rqt",
"url": null
} |
datetime, typescript, browser-storage
! window.localStorage
? console.warn('Current browser doesn\'t support Local Storage API');
: NotificationsStorage
&& NotificationsStorage.lastCheck
&& NotificationsStorage.lastCheck > today
? (
this.lastCheck = NotificationsStorag... | {
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"id": 30507,
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"openwebmath_score": null,
"tags": "datetime, typescript, browser-storage",
"url": null
} |
ros, python, ros-melodic, rosdep, dependencies
On a whim I have tried to change the dependencies to <depend> without luck.
Additional info:
Ubuntu 18.04
ROS melodic
All help appreciated.
Originally posted by luis on ROS Answers with karma: 3 on 2020-02-27
Post score: 0
There is already a ROS package named percept... | {
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"tags": "ros, python, ros-melodic, rosdep, dependencies",
"url": null
} |
c#, thread-safety, concurrency
foreach (var file in fileList)
{
var fileName = Path.GetFileName(file);
if (File.Exists(file))
{
Log.AddToLog("Beginning to Process File: " + fileName);
if (!ValidateFile(file))
{
Log.AddToLog(String.Format("... | {
"domain": "codereview.stackexchange",
"id": 22807,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "c#, thread-safety, concurrency",
"url": null
} |
quantum-entanglement, non-locality, nature
The entanglement of many-body ground states is highly relevant, since many systems are nearly in their quantum ground states even at everyday temperatures. Examples include the electrons in a typical metal, or the electromagnetic radiation field at optical frequencies. This i... | {
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"tags": "quantum-entanglement, non-locality, nature",
"url": null
} |
qiskit, clops
qubit_converter = QubitConverter(ParityMapper(), two_qubit_reduction=True, z2symmetry_reduction='auto')
molecule = MoleculeInfo(["H", "Be", "H"], [(0., 0., -1.3264), (0., 0., 0.), (0., 0., 1.3264)],)
driver = PySCFDriver.from_molecule(molecule, basis="sto3g")
electronic_structure_problem = driver.run()
... | {
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"tags": "qiskit, clops",
"url": null
} |
string-theory, spacetime-dimensions, duality
Could you show a bit math of how that was possible, please? I thought the T-duality was a symmetric equivalence between the "heavy" and "light" theory, so how could the dimension of the $D$-brane change under the T-duality? Didn't that lead to a different theory? $T$-dualiz... | {
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"tags": "string-theory, spacetime-dimensions, duality",
"url": null
} |
quantum-mechanics, wavefunction, hilbert-space, dirac-delta-distributions
and your relation is this evaluated in position space: Apply $\langle x \rvert$ from the left and $\lvert x' \rangle$ from the right to obtain
$$ \sum_n \langle x \lvert \psi_n \rangle\langle \psi_n \vert x' \rangle = \langle x \vert x' \rangle$... | {
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"tags": "quantum-mechanics, wavefunction, hilbert-space, dirac-delta-distributions",
"url... |
telescope, telescope-lens
"... this concept is well fitted for space missions in any spectral domain, from far UV (100 nm) to IR (25 μm). However, the advantages of Fresnel arrays become outstanding in the UV domain, for which a 6 m size aperture yields milliarcseconds angular resolutions with a very rough manufacturi... | {
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"tags": "telescope, telescope-lens",
"url": null
} |
jquery
I just made a comment for every code change that I made.
Let me explain:
1. Cache HTML elements
Since you use element in multiple places it makes sense to reuse the variable that stores a reference to that HTML element wrapped inside jQuery object.
2. Remove anonymous function if you don't need to pass event o... | {
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and stochastic integral conditions. (b) Determine the specific solution that satisfies the initial conditions (0) = -2, y(0) = 1. A study of existence, uniqueness, and stability of solutions to a coupled system of fractional differential equations with non-separated boundary conditions is the main target of this paper.... | {
"domain": "mantovan-knab.de",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.987568348780928,
"lm_q1q2_score": 0.8186337322611165,
"lm_q2_score": 0.8289388104343892,
"openwebmath_perplexity": 389.25858552257097,
"openwebmath_score": 0.5333122611045837,
"tags... |
Let us consider now the $$n \times n$$ tridiagonal matrix :
$$\Delta_n:=\begin{pmatrix}2&1&&&&\\1&2&1&&&\\&1&2&1&&\\&&\ddots&\ddots&\ddots\\&&&1&2&1\\&&&&1&3\end{pmatrix}$$
(please note the bottom right exceptional entry $$3$$).
It is not difficult to prove that $$\Delta_n$$ has the following eigenvalues :
$$\mu_k=... | {
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"lm_q2_score": 0.8221891370573388,
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"openwebmath_score": 0.9400591254234314,
"tags... |
python, python-3.x, matrix
print('Matrix1: ', Matrix1)
print('Matrix2: ', Matrix2)
print('Result of Matrix Multiplication:', Product)
# Footnotes
print('\n\nCreated by: MK')
input('Press "Enter" to Exit') # Easy way to Exit program If run from script I have basically two comments:
Naming.
Use functions to fol... | {
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"tags": "python, python-3.x, matrix",
"url": null
} |
c#, object-oriented, interview-questions
private static void ProcessMainMenuUserChoice(int userChoice, InventoryManager inventory)
{
switch (userChoice)
{
case 1:
ReadFlightScheduleMenuUserChoice(inventory);
break;
case 2:
inve... | {
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"tags": "c#, object-oriented, interview-questions",
"url": null
} |
genetics, bioinformatics, database, yeast
The orthologs of C. Albicans with A. gossypii
orf19.2119 AGR347W
orf19.4998 AFR275W
orf19.5908 AER177W
orf19.610 ABR055C
orf19.723 NONE
orf19.4056 ADR249W
The orthologs of C. Albicans with K. waltii
orf19.2119 Kwal33.14699
orf19.4998 Kwal26.8099
orf19.5908... | {
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"openwebmath_score": null,
"tags": "genetics, bioinformatics, database, yeast",
"url": null
} |
immunology
When a naïve or memory B cell is activated by antigen (with the aid of a helper T cell), it proliferates and differentiates into an antibody-secreting effector cell. Such cells make and secrete large amounts of soluble (rather than membrane-bound) antibody, which has the same unique antigen-binding site as ... | {
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"tags": "immunology",
"url": null
} |
visible-light
So that would pretty pretty large glasses or goggles, metallic with electronics. If you wanted that resolution in 2D you'd need it 5 m on a side or circular. That is called cross-range resolution, you are not exploiting the timing of the returned wave. If you wanted to also get the range resolution, i.e.... | {
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"tags": "visible-light",
"url": null
} |
c++, mathematics
Let's stop. This operator changes the value of the current item. That's completely unexpected. If I have
complex a = foo();
complex b = bar();
complex a_cp = a;
complex b_cp = b;
complex c = a - b;
then I expect a == a_cp and b == b_cp. However, this isn't true. This also prevents us from using opera... | {
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} |
Arithmetic mean point of 5/2 and 7/2 is 3. Let us raise each number to $7 \cdot 5$ (which is a monotonically increasing function) and rewrite the two numbers as $$(3-1/2)^{2\cdot 7} = (3-1/2)^{2\cdot 5 + 4} \hspace{0.2cm}\text{ and } \hspace{0.2cm} (3+1/2)^{2 \cdot 5}$$
Write the difference of these two numbers and fa... | {
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"openwebmath_score": 0.905336320400238,
"tag... |
fluid-dynamics, estimation, aerodynamics, turbulence
Title: How much will a hole in the wing of a bumblebee affect its flying? let's assume the holes are round shape in the middle of both wings. if the size is 1% of the whole wing, how much will be the impact? i assume this is not linear, how much will be affected if ... | {
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"tags": "fluid-dynamics, estimation, aerodynamics, turbulence",
"url": null
} |
php, drupal
$searchUser = $this->dbGetSearchUserByEmail($srchParam['email']);
$hashUnsubscribeAll = $searchUser['unique_hash'];
$dotMailerPacket = [
'replyEmailAddress' => '',
'recipientEmailAddress' => $srchParam['email'],
'searchLocation' => $srchParam['search_loc... | {
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"tags": "php, drupal",
"url": null
} |
catkin-make, cmake
The FindFFMPEG.cmake file sets the FFMPEG_LIBRARIES variable:
set(FFMPEG_LIBRARIES
${FFMPEG_LIBAVCODEC}
${FFMPEG_LIBAVFORMAT}
${FFMPEG_LIBAVUTIL}
)
Setting the CMAKE_MODULE_PATH messes up the whatever directory cmake thinks it's in, so you need to specify absolute paths when you use add_execu... | {
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"tags": "catkin-make, cmake",
"url": null
} |
spacetime, differential-geometry, operators, quantum-gravity, non-commutative-geometry
Theorem 1 gives a concrete realization of this quantization of the
volume by interpreting the integer $k$ as the number of geometric
quantas forming the Riemannian geometry $M$. Each geometric quantum is a sphere of arbitrary shape ... | {
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"tags": "spacetime, differential-geometry, operators, quantum-gravity, non-commutative-geom... |
filters, discrete-signals, filter-design, noise
Title: How to remove or filter the drift problem in measured Strain signal? I have the strain signal of a lateral beam of a car measured at sampling rate 1,200Hz from data acquiring system. Even after using temperature compensation in strain gage, we are getting drift. S... | {
"domain": "dsp.stackexchange",
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"openwebmath_score": null,
"tags": "filters, discrete-signals, filter-design, noise",
"url": null
} |
java, strings
It returns true when the hashes match. But hashes are not unique, they cannot be, there are fewer of them than there are strings. So there should be a proper string comparison here, to distinguish false positives from true positives.
False positives are not only a problem for huge strings. As a specific ... | {
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"openwebmath_score": null,
"tags": "java, strings",
"url": null
} |
c++, bitset
Pointers/dynamic memory are normally only used when you need to extend the lifetime of an object beyond its scope of declaration. This is not the case in your example.
Not to mention, of course, that the object in your sample code is never deleted and thus leaks memory. | {
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"tags": "c++, bitset",
"url": null
} |
thermodynamics, entropy, ideal-gas
Title: Consideration on the total entropy variation for 2 ideal gases Let's consider an isolated container containing a mole of an ideal monoatomic gas $A$ and a mole of a biatomic gas $B$, separated by an ideal piston (hermetic). The gases slowly exchanges heat and the piston slides... | {
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"openwebmath_score": null,
"tags": "thermodynamics, entropy, ideal-gas",
"url": null
} |
satellites, sea-floor, ground-truth, satellite-oddities
This is what Google Maps and other mapping services show by default. The problem is that this information is not very accurate: That's because not just the point immediately under the satellite pulls on the satellite, but also points elsewhere. So a very steep un... | {
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"id": 1800,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "satellites, sea-floor, ground-truth, satellite-oddities",
"url": null
} |
javascript, html
const dataLastEdited = (timestamp) => {
return `Last edited ${moment(timestamp).fromNow()}`;
};
and finally, this is the note-edit.js file which is responsible for the edit.html page
const noteID = location.hash.substring(1);
const noteTitle = document.querySelector("#note-title");
const noteBody =... | {
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"id": 40256,
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"tags": "javascript, html",
"url": null
} |
sql, sql-server, xml
<Border>
<Color>#4e648a</Color>
<Style>Solid</Style>
</Border>
<BackgroundColor>#384c70</BackgroundColor>
<PaddingLeft>2pt</PaddingLeft>
... | {
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"id": 8078,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "sql, sql-server, xml",
"url": null
} |
acoustics, doppler-effect
The sonar also has a finite max distance, beyond which the signal strength becomes too low for an echo to register, even with a perfect surface to bounce off. Driving outdoors, or on a big open area indoors, navigating between cones, most of the readings will not give an echo, and will thus ... | {
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"id": 31206,
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"lm_q1_score": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "acoustics, doppler-effect",
"url": null
} |
protein-structure, linux, awk
89.2 58.2 -24.0 91.7 60.5 -24.7 94.7 62.8 -22.0 93.4 60.4 -19.2 92.5 58.9 -19.8 95.9 62.4 -19.6 97.2 63.7 -16.5 95.4 60.4 -14.7 95.9 60.3 -15.3 99.6 63.7 -13.7 99.7 62.8 -10.5 97.9 60.1 -10.1 100.5 62.5 -10.4 103.3 65.4 -8.5 101.8 64.0 -5.6 99.5 62.8 -2.7 101.7 59.2 -2.6 100.6 57.9 -4.3 9... | {
"domain": "bioinformatics.stackexchange",
"id": 2415,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "protein-structure, linux, awk",
"url": null
} |
bioinformatics, proteins, structural-biology
There are limits to possible distributions of phi and psi angles due to steric clashes between the side chains. Furthermore other limitations from higher order structure will result in the adoption of defined phi-psi angles. Using data from solved crystal structures, it can... | {
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"id": 308,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "bioinformatics, proteins, structural-biology",
"url": null
} |
ros, ros-melodic, cv-bridge, python3
import rospy
import sys
import cv2
import cv2.cv as cv
from sensor_msgs.msg import Image, CameraInfo
from cv_bridge import CvBridge, CvBridgeError
import numpy as np
class cvBridgeDemo():
def __init__(self):
self.node_name = "cv_bridge_demo"
#Initialize the ros... | {
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"id": 36075,
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"openwebmath_score": null,
"tags": "ros, ros-melodic, cv-bridge, python3",
"url": null
} |
java, error-handling, http, library, rest
Title: Single class which holds response and error message I am working on a library which will make HTTP call to my rest service basis on inputs passed to this library. And whatever response comes back from service whether it is successful response or failure coming from the ... | {
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"id": 17388,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, error-handling, http, library, rest",
"url": null
} |
human-biology, biophysics, skin, light, uv
Title: Can UV radiation be safe for the skin? It is well known that UV radiation can damage the DNA and generally harm our skin.
We also know that UV radiation helps on the production of melanin and Vitamin D.
From what I could find, the DNA absorption spectrum goes to almost... | {
"domain": "biology.stackexchange",
"id": 10010,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "human-biology, biophysics, skin, light, uv",
"url": null
} |
quantum-mechanics, wavefunction, solid-state-physics
Cancelling the factor $e^{i\mathbf k \cdot \mathbf x}$ from both terms in $(\star)$ yields that $u_{n\mathbf k}$ is a solution of the equation $H_\mathbf k u_{n\mathbf k} = E_{n\mathbf k} u_{n\mathbf k}$, where $H_{\mathbf k} \equiv -\frac{\hbar^2}{2m} (\nabla +i\ma... | {
"domain": "physics.stackexchange",
"id": 93817,
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"openwebmath_score": null,
"tags": "quantum-mechanics, wavefunction, solid-state-physics",
"url": null
} |
javascript, html
function translate(spriteIndex, dX, dY) {
const sprite = "sprite" + spriteIndex;
const posLeft = parseInt(document.getElementById(sprite).style.left.slice(0, -2)) + dX;
const posTop = parseInt(document.getElementById(sprite).style.top.slice(0, -2)) + dY;
document.getEle... | {
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"openwebmath_score": null,
"tags": "javascript, html",
"url": null
} |
formal-grammars
As for the first set, frankly, I'm just having trouble following my professor's notes for creating the first set. Could anyone help here or point me to a good resource for this?
Thank you all so much. A nonterminal $X$ is nullable if you can generate the empty word from it. For example, since $A \to \e... | {
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"tags": "formal-grammars",
"url": null
} |
This topology is compact---in the cases of $X$ and $Y$ and also in the case of the set of all partitions---simply because there is a coarsest partition, the partition with only one component consisting of the whole set. The only open neighborhood of this partition in the lower-cone topology is the entire space of parti... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.980580656357574,
"lm_q1q2_score": 0.8392310866481616,
"lm_q2_score": 0.8558511543206819,
"openwebmath_perplexity": 257.4004398918618,
"openwebmath_score": 0.8535194396972656,
"tags... |
Solutions:
Notice that there are two useful invariants.
• Starting from a corner, the number of faces between edges is $$C_{N}^{2}$$.
• Each face is shared by $$4$$ corners.
Then the numebr of 2D faces of a cube in $$N$$ dimensions is $$C_{N}^{2} \cdot 2^{N} \cdot \frac{1}{4} = C_{N}^{2} \cdot 2^{N-2}$$. Therefore, ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9732407137099625,
"lm_q1q2_score": 0.8490039766899767,
"lm_q2_score": 0.8723473697001441,
"openwebmath_perplexity": 379.8880349867579,
"openwebmath_score": 0.753924548625946,
"tags... |
algorithm, go, concurrency, dining-philosophers
I implemented the following code:
package main
import (
"fmt"
"sync"
"time"
)
// define variables
var numPhilo int = 5
var numCS int = 5
var eatTimes int = 3
var numEatingPhilo int = 2
type Host struct {
// channel for allowed philosopher for eating
... | {
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"id": 43648,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithm, go, concurrency, dining-philosophers",
"url": null
} |
python, python-2.x, matrix, circular-list
def __delitem__(self, idx):
if not isinstance(idx, int):
raise TypeError("Ring indices must be integers, not {}".format(type(idx)))
del self._items[idx % len(self._items)]
(the error mirrors that of indexing lists).
In the scheme of things, this code is simpl... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-2.x, matrix, circular-list",
"url": null
} |
objective-c, ios
[self coffeeDrinksCell:indexPath:cell];
}
else if (sectionFive== lunchSection)
{
[self lunchCell:indexPath:cell];
}
else if (sectionFive == dinnerSection)
{
[self dinnerCell:indexPath :cell];
}
else if (secti... | {
"domain": "codereview.stackexchange",
"id": 4384,
"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": "objective-c, ios",
"url": null
} |
rviz, mesh, collada, solidworks, stl
GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
GLX_SGIX_visual_select_group, GLX_EXT_texture_from_pixmap,
GLX_INTEL_swap_event
GLX version: 1.4
GLX extensions:
GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context,
GLX_EXT_visual_info,... | {
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"id": 7687,
"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": "rviz, mesh, collada, solidworks, stl",
"url": null
} |
c#, winforms
if (UpdateSettings)
SaveVideoDirectories();
this.dgwMyVideos.Invoke(new UIUpdaterDelegate(() =>
{
this.dgwMyVideos.Refresh();
}));
this.dgwVideoFolders.Invoke(new UIUpdaterDelegate(() =>
{
this.dgw... | {
"domain": "codereview.stackexchange",
"id": 18197,
"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": "c#, winforms",
"url": null
} |
c++, programming-challenge, chess
Variable Declarations
Declare and initialize variables one per line. While the following results in a lot of added vertical space it is easier to read and maintain:
int u = 0;
int d = 0;
int l = 0;
int r = 0;
int ul = 0;
int ur = 0;
int dl = 0;
int dr =... | {
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"id": 39717,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, programming-challenge, chess",
"url": null
} |
## Share Results of Econometric Modeler App Session
This example shows how to share the results of an Econometric Modeler app session by:
• Exporting time series and model variables to the MATLAB® Workspace
• Generating MATLAB plain text and live functions to use outside the app
• Generating a report of your activi... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9702399034724604,
"lm_q1q2_score": 0.8126923045053687,
"lm_q2_score": 0.8376199552262967,
"openwebmath_perplexity": 4779.197577157515,
"openwebmath_score": 0.5098170638084412,
"tags": ... |
control-theory, modeling, transfer-function
+ \frac{2}{2!} \delta^{2}_{\dot{\theta}}
=
\color{blue}{a^2} +
\color{red}{
\frac{2 a}{1!} \delta_{\dot{\theta}}
}
+ \frac{2}{2!} \delta^{2}_{\dot{\theta}}
$$
The term in blue is part of the steady state and is usually not accounted for deviations from steady state which we ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "control-theory, modeling, transfer-function",
"url": null
} |
php, object-oriented, dependency-injection, cli
public function connect() {
// I'll use netcat -l -p 1234 for the testing server..
$this->net->connect('tcp://127.0.0.1:1234');
}
public function iterate() {
$this->net->iterate();
}
public function on_connect() {
$this->net->send("A client has ... | {
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"id": 14451,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, object-oriented, dependency-injection, cli",
"url": null
} |
database, public-databases, protein-protein-interaction
Title: Receptor-ligand database How can I find ligands of receptors (or vice versa)?
For example, I want to find the receptors of IL-8 (CXCL8). CellPhoneDB is a publicly available repository of curated receptors, ligands and their interactions.
The interactions c... | {
"domain": "bioinformatics.stackexchange",
"id": 1670,
"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": "database, public-databases, protein-protein-interaction",
"url": null
} |
ros, macbook, boost, compilation, osx
Error:
[ 50%] Building CXX object CMakeFiles/cpp_common.dir/src/header.cpp.o
In file included from
/Users/codeporter/Development/indigo/ros_catkin_ws/src/roscpp_core/cpp_common/src/header.cpp:35:
/Users/codeporter/Development/indigo/ros_catkin_ws/src/roscpp_core/cpp_common/inc... | {
"domain": "robotics.stackexchange",
"id": 18256,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, macbook, boost, compilation, osx",
"url": null
} |
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