text stringlengths 1 1.11k | source dict |
|---|---|
And lucky us, we can stop early! Our residues for $n=3$ are the same as for $n=0$, and we generate each new row by multiplying both of the values in the two middle columns by 2 (since $3^2 \cong 2$).
So the pairs of residues can only ever by $(4,3), (1,6)$ or $(2,5)$. Adding any of these pairs yields a multiple of 7, ... | {
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"tag... |
ros, urg-node, hokuyo, hokuyo-laser, cmake
Comment by schultza on 2015-02-26:
You are right :) I started the urg_node which is publishing the /scan (which I am want to subscribe to) and also others like /echoes. So if I rostopic echo /scan I dont see anything, however if I rostopic echo /echoes I can see some data
Com... | {
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"tags": "ros, urg-node, hokuyo, hokuyo-laser, cmake",
"url": null
} |
c++, n-queens
TEST_CASE("eight queens test")
{
std::ostringstream out;
std::streambuf* coutbuf = std::cout.rdbuf();
std::cout.rdbuf(out.rdbuf()); // redirect cout to out
int n;
std::cin >> n;
for(int i = 0; i < n; i++)
{
std::array<std::array<int, 8>, 8> arr{};
std::string... | {
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"tags": "c++, n-queens",
"url": null
} |
php, design-patterns, mysql
protected $connection = array();
protected $activeConnection = 0;
//Not in use
protected $lastactiveConnection;
public function __construct(){
//Empty
} | {
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"tags": "php, design-patterns, mysql",
"url": null
} |
ros, catkin-make, qt4
Title: Unable to integrate with Qt
I am trying to implement Grid based FAST SLAM in ROS. I have taken the source code from http://openslam.org/gridslam.html .
I have made a catkin package and put all the source code in src folder.
Now, I am trying to build that package using
$catkin_make
It is g... | {
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What exactly is the difference between a mathematician, a physicist, and a layman? Let us suppose that they all start measuring the angles of hundreds of triangles of various shapes, find the sum in each case and keep a record. Suppose the layman finds that with one or two exceptions, the sum in each case comes out to ... | {
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"lm_q2_score": 0.9046505370289057,
"openwebmath_perplexity": 396.8077610602914,
"openwebmath_score": 0.853187024593353... |
electricity, electric-current, charge, dimensional-analysis
Title: Why is current not charge/area? Current is defined as charge/time and the only use of current is to see how much charge passes through an area in 1 second, and current depends on voltage.
So even if we change current as charge/area or charge/volume it ... | {
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"tags": "electricity, electric-current, charge, dimensional-analysis",
"url": null
} |
java, sql, mysql, database, jdbc
Multithreading: connections normally cannot be shared amongst multiple threads (eventually invalidating their underlying objects and doing all kinds of funny things.) I see no precautions to avoid multi-threaded access in the code.
General utility: ask yourself, what are you going to d... | {
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"tags": "java, sql, mysql, database, jdbc",
"url": null
} |
soft-question, research-practice
I am at a loss - in attempting to solve a difficult problem I have only given rise to an even more difficult one! Worrying about someone taking credit for your work is very common among amateurs and people just starting out, but in my experience is far less common with more experienced... | {
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"tags": "soft-question, research-practice",
"url": null
} |
homework-and-exercises, lagrangian-formalism, symmetry, noethers-theorem, variational-calculus
\begin{equation}
\mathcal{L}\rightarrow\mathcal{L}+\alpha\partial_\mu J^\mu.\tag{2}
\end{equation}
Now we proceed varying the Lagrangian:
\begin{equation}
\delta\mathcal{L}=\frac{\partial\mathcal{L}}{\partial\phi}\delta\phi+... | {
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"tags": "homework-and-exercises, lagrangian-formalism, symmetry, noethers-theorem, variatio... |
java, interview-questions, queue, stack
public T peek() {
shiftStacks(); // ensure stackOldest has the current elements
return stackOldest.peek(); // retrieve the oldest item
}
public T remove() {
shiftStacks(); // ensure stackOldest has the current elements
return stackOldest.pop(); // pop the ol... | {
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"tags": "java, interview-questions, queue, stack",
"url": null
} |
turing-machines, computation-models
It is possible to model today's computers by mathematical tools. They're just finite-state machines, after all. There are a lot of states, so a complete pen-and-paper representation is not feasible, but if you only model the part that you're interested in, that can be within reach.
... | {
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"tags": "turing-machines, computation-models",
"url": null
} |
I don't know if the points where the components of piece wise functions join have a name, but checking whether they are discontinuities, or non-differentiable points is not difficult.
Lets begin with discontinuities. In order for the point $p$ not to be a discontinuity, $$\lim_{x\to p^+} f(x) = \lim_{x\to p^-} f(x) = ... | {
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"openwebmath_score": 0.8758719563484192,
"tags... |
java, performance, game-of-life, memory-optimization
@Override
public int countAdjacentLife(final Generation generation, final int x, final int y) {
int adjacentLife = 0;
for (final int[] add : SURROUNDING_CELL_POSITIONS) {
final int xIndex = (x + add[0]);
final int yIndex ... | {
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"tags": "java, performance, game-of-life, memory-optimization",
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} |
quantum-field-theory, pressure, electrons, pauli-exclusion-principle, leptons
If you were to keep pushing the densities higher, then the Fermi energies of the electrons and muons (which are equal) would reach the rest mass energy of a tau lepton (1777 MeV). At that point it becomes energetically feasible to create tau... | {
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"tags": "quantum-field-theory, pressure, electrons, pauli-exclusion-principle, leptons",
... |
java
Is the use of == here correct / best practice? No, it's not correct (and thus of course also not best practice). For example the condition c == Color.GREEN will be true if the method is called as brickVal(Color.GREEN), but false if it is called as brickVal(new Color(0, 255, 0)). Since Color.GREEN is equal to new ... | {
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"tags": "java",
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} |
friend named Sue who likes Mysteries Michael... Where each member appears, so we 're done we have checked every element of both sets because... A membership rule ( formula ) or by listing its members within braces … an set. Earn credit-by-exam regardless of age or education level if something is not in a Course lets yo... | {
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"lm_q1q2_score": 0.8190182424032914,
"lm_q2_score": 0.8652240843146881,
"openwebmath_perplexity": 1160.5609386310566,
"openwebmath_score": 0.5272994637489319,
"tags"... |
machine-learning, python, nlp, pandas
Title: How to add time as a feature into clustering algorithm? I've wrote here about my problem. And now I have a new one.
How to use time as a feature? I have a pandas DataFrame with date-time column('date') and I don't know how to use it as a feature. For now I'm using TfidfVec... | {
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"openwebmath_score": null,
"tags": "machine-learning, python, nlp, pandas",
"url": null
} |
general-relativity, gravity, quantum-gravity
Title: Equations of gravitation in Bronstein's article I'm studying Matvei Bronstein's 'Quantum theory of weak gravitational fields' and in the general remarks whilst he gives the correct expression for the Riemann-Christoffel curvature tensor in first order approximation, ... | {
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"tags": "general-relativity, gravity, quantum-gravity",
"url": null
} |
game, functional-programming, scala, battle-simulation
object Action
class Attack
val attacker: Battler
val defender: Battler
def apply(Map[String, Battler]): Map[String, Battler]
class Heal
val battler: Battler
def apply(Map[String, Battler]): Map[String, Battler] | {
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"tags": "game, functional-programming, scala, battle-simulation",
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beginner, strings, ruby
And if you want to clean it up so its a single chained statement.
def most_common_letter(string)
string.split('')
.each_with_object(Hash.new(0)) { |ch,hash| hash[ch] += 1 }
.max_by{ |ch,count| count }
end
What are the disadvantages of my solution ?
The biggest issue is that ... | {
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catkin-make
Comment by adiadidas15 on 2016-05-19:
I am using Hydro so that I can follow along with the book I purchased. I plan on using Indigo after working through the tutorials.
Comment by adiadidas15 on 2016-05-19:
Well, it seems I spoke too soon about resolving my problem. rospack find is now able to find my ne... | {
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ros, ekf, ros-kinetic, navsat-transform-node, ekf-localization-node
I don't have any /odom topic nor odom frame like mobile robots do.
Can you please explain in this particular case how should i extend the urdf in order to have an odom frame/topic that is required by the navsat_transform_node?
EDIT:
The mobile platfor... | {
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"url": nu... |
quantum-gate, matrix-representation, quantum-circuit
Title: Method to derive Matrix description of a circuit This question is about finding a matrix description of a specific circuit. I am learning quantum computing through edX's Quantum Information Science lecture series. The question below is the one I am stuck on | {
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solvents, mixtures, adsorption
Now, I know almost nothing about adsorption beyond what I just read on Wikipedia, but I didn't see an example there where two liquids interacted in the way described. Instead, the examples seemed to be ones where a porous solid (e.g., activated charcoal) adsorbs some liquid.
Does this o... | {
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• Of course. Integrate. Aug 25 '20 at 1:02
• OK, for the first, subtract and the resulting form is exact. You can write down the potential function explicitly. For the $\delta$ term, star and do the same. Aug 25 '20 at 1:11
• @TedShifrin Sorry for the late reply. Your answer and example are pretty good. I think maybe w... | {
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"openwebmath_score": 0.9044852256774902,
"ta... |
c++, object-oriented, design-patterns, entity-component-system, constrained-templates
#include "System.h"
#include "SystemExceptions.h"
#include "TypeTag.h"
class SystemManager
{
public:
SystemManager(const SystemContext& context)
: context(context) { }
template<typename SystemType, typename... Args>... | {
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"tags": "c++, object-oriented, design-patterns, entity-component-system, constrained-tem... |
assembly
Exit properly.
hlt ; halt the cpu
welcome db "boot", 0x0A, 0x0D, 0x00
Congratulations! You just executed a prompt string as code.
The IBM PC Compatible firmware provides two software interrupts for properly "exiting" a bootstrap program back to the fi... | {
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Here's another way of working it out.You've got 7 elements in set A and 5 elements in set B.Since an onto function is our requirement,it's absolutely necessary that your required function is many-one as well(in your case).We have two choices,either only one element of our codomain is mapped to thrice,or two of them(of ... | {
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"lm_q2_score": 0.8267117962054049,
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"openwebmath_score": 0.8048818707466125,
... |
# How many positive integers are factors of a given number?
I've been trying to find / generate a formula for the following problem:
• Given a number, how many positive integers are factors of this number.
In practice, you could simply build a table as such (lets assume the number is 36):
1 | 36
2 | 18
3 | 12
4 | 9... | {
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"openwebmath_score": 0.8652845025062561,
"tags... |
organic-chemistry, reaction-mechanism, amines
$$\ce{KOD + H2O <=>> KOH + HOD}$$
Assuming that the amount of $\ce{KOD}$ is much less than the amount of $\ce{H2O}$ (after all $\ce{H2O}$ is the solvent) then the position of this equilibrium will lie very, very far to the right. So, at the end of the day, if you are using... | {
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"tags": "organic-chemistry, reaction-mechanism, amines",
"url": null
} |
physical-chemistry, metals
Now, one would ask: what about Au? It has a 6s electron and it is a very stable solid metal, which means it forms strong metallic bonds with other gold atoms. The question then turns to be, what makes metallic bonds strong in gold and weak in Hg? And, here comes the indispensable valence she... | {
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"tags": "physical-chemistry, metals",
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} |
ros
Comment by Rikardo on 2013-07-17:
with rosws merge [...], we can not have permission to download the code. I can git clone the code and compile by myself. But to compile each package one by one is a huge work, especially to compile the knowrob_addons.
Comment by moritz on 2013-07-17:
You should not need to install... | {
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mechanical-engineering
Up and down over table lights are often referred to as rise and fall
lights and The Lighting Company has a great selection of rise and fall
ceiling lights including pull up and down pendant lights. When raised
up, a rise and fall light will give a wide spread of light and when
lowered over a tab... | {
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1. Values between 89. Aidun et al. We have step-by-step solutions for your textbooks written by Bartleby experts!. The longer axis, a, is called the semi-major axis and the shorter, b, is called the semi-minor axis. For example the graph of the equation x2 + y2 = a we know to be a circle, if a > 0. The general equation... | {
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"tags":... |
• Thanks a lot! I still need to go through your proof, but just out of interest, is this a well-known theorem? Do you have maybe some reference? If not and the proof really works, do you consider publishing it somewhere? (I think it would be worth it). What I am not currently sure yet is your last step that if g' has a... | {
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"lm_q2_score": 0.8438951005915208,
"openwebmath_perplexity": 126.82154200506774,
"openwebmath_score": 0.9491117596626282,
"ta... |
unsupervised-learning
Using an already established dataset, e.g. Iris (without the labels).
Generating your own synthetic 2-dimensional data, to better understand how the algorithms work. An example is this. | {
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ros-melodic
Originally posted by bcopenha on ROS Answers with karma: 15 on 2019-07-11
Post score: 1
Please try as follows.
Play rosbag(slam_topics_2019-07-01-10-02-59.bag) and pause immediately. | {
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molecular-orbital-theory
There is a car on the nearer lane. It is going either north or south, but we don't know which.
There is a car on the further lane. It is also going either north or south, but we don't know which.
This situation is exactly analogous to having two hydrogen atoms, with one electron in each 1s o... | {
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Algebra
The graph's turning point of a quadratic function $$f(x)=ax^2+bx+c$$ is over the X-axis. If the coordinate of the turning point is (p, q) and a > 0, the correct statement is ....
A. c is less than zero
B. c is more than zero
C. q is less than zero
D. q equals zero
Since the point (p, q) is over the X-axis... | {
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"openwebmath_score": 0.7255077362060547,
"tags": nul... |
### Rehashing
• As discussed above, once the load factor is greater than 0.8, we need to rehash
• How large is the new space depends, in CPython 3.7, it’s currently set to 3, so new space will be used space * 3
• Once the new space is created, all the elements in the old hash will be copied into the new one, which inv... | {
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"lm_q1_score": 0.9873750533189538,
"lm_q1q2_score": 0.8332409699421568,
"lm_q2_score": 0.8438951005915208,
"openwebmath_perplexity": 7919.008880128275,
"openwebmath_score": 0.21766309440135956,
"tags": ... |
optics, non-linear-optics
Title: Topological phase in Laguerre-Gaussian transverse mode Why is the topological phase in a Laguerre-Gaussian transverse mode is the sum of orbital angular momenta per photon, and why is it quantized? I take this question to mean:
Why does the Laguerre-Gaussian (LG) modes have an $e^{i\... | {
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c++, algorithm, boost, numerical-methods
Real yp = f(x);
Real ym = f(-x);
Real term = (yp + ym)*w;
sum += term;
Real abterm = (abs(yp) + abs(ym))*w;
absum += abterm;
// There are claims that this test improves performance,
// however m... | {
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"tags": "c++, algorithm, boost, numerical-methods",
"url": null
} |
c++
constexpr unsigned read_str = 0xC; // Read a word(string) from the keyboard into a specific location in memory
constexpr unsigned write_str = 0xD; // Write a word(string) from a specific location in memory to the screen
constexpr unsigned load = 0x14; // Load a word from a specific location in memory to the accumu... | {
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condensed-matter, mathematical-physics, fourier-transform, x-ray-crystallography, quasicrystals
In summary it depends on the rule. [It may also be a tautology since quasi-crystals are required to have well defined discrete spectra by definition,
but I assume that is not important here]
In more detail the Fourier trans... | {
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"tags": "condensed-matter, mathematical-physics, fourier-transform, x-ray-crystallography, ... |
untagged
Bioinformatic patents are tricky.
The reality is both points are not systematically automated in 'point and click' user friendliness. Its definitely of commercial value at an industrial/institutional level. However most work is submitted to the public domain and code freely available or held under a commercia... | {
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"openwebmath_score": null,
"tags": "untagged",
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} |
ros
Title: Why is msg header not generated
Hi,
I'm trying to build my package (Gui), which contains a msg-folder, containing rect.msg, containing four Int32 values. In my CMakeLists.txt I added
rosbuild_genmsg()
When running cmake, the folder msg_gen is generated, containing the "generated"-file (containing "yes"). ... | {
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"tags": "ros",
"url": null
} |
quantum-field-theory, resource-recommendations, scattering, s-matrix-theory
Title: Materials about S-matrix and S-matrix theory What is the best book or paper to learn about analytical structures of S-matrix and S-matrix theory?
I already know books as The Analytic S-matrix by RJ Eden, PV Landshoff, DI Olive, JC P and... | {
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"tags": "quantum-field-theory, resource-recommendations, scattering, s-matrix-theory",
"u... |
python, beginner, game, tic-tac-toe
# when game is over, replay the game
def replay():
replay = input('press any key to play again. type "q" to quit')
while True:
if 'q' in replay:
return False
break
else:
return True
break | {
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"tags": "python, beginner, game, tic-tac-toe",
"url": null
} |
Pipeline 2
One instruction ----> x/n units
? -----------------------> 1 units
$= \frac{n}{x} units$
$percentage \ of \ gain\ in \ throughput = \frac{old value- new value}{old value} * 100$
1700 = (n-1)* 100
17 = n-1
18=n
answered Jun 14 by (31,090 points)
edited Jun 15
In pipeline 1, stage delay= x units. If we ... | {
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"openwebmath_score": 0.31003907322883606,
"tags"... |
python
for i in xrange(len(keep)):
if big_gaps[::-1][i]:
keep[::-1][i] = False
n[1] += 1
else:
break
if sum(n) > 0:
logging.info("%i points trimmed (%i from beginning, %i from end)" % (sum(n), n[0], n[1]))
else:
logging.info("No points trimme... | {
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"openwebmath_score": null,
"tags": "python",
"url": null
} |
finite-automata, pushdown-automata, nondeterminism
Title: PDA for all non-palindromic strings of even length I had a homework assignment where I had to build a PDA over the alphabet $\{a,b\}^*$, accepting $L = \{x \mid x \text{ is even but not a palindrome}\}$.
I already turned it in, but I know I had it wrong and it'... | {
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"openwebmath_score": null,
"tags": "finite-automata, pushdown-automata, nondeterminism",
"url": null
} |
cc.complexity-theory, computability, oracles
Title: Is P=NP relative to the halting oracle? Consider the following variant $\mathscr{H}$ of the halting oracle: given the code $e$ for an ordinary Turing machine and an input $n$ to it, we let $\mathscr{H}(\langle e,n\rangle) = \langle 0,0\rangle$ if the result $\varphi_... | {
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"tags": "cc.complexity-theory, computability, oracles",
"url": null
} |
Position the ellipse: As shown at right, position an ellipse with center at the origin and foci (marked with ‘x’) on the $x$-axis. Notation ($\,c\,$ and $\,a\,$): Define: $c = \,$ the distance from the center (the origin) to each focus. Since $\,c\,$ is a distance, $\,c > 0\,$. The coordinates of the foci are therefore... | {
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"openwebmath_score": 0.9378538727760315,
... |
quantum-mechanics, operators, vectors, tensor-calculus, commutator
$$
[ A_i , B_j ]_{ab} = (A_i)_{ac} (B_j)_{cb} - (B_j)_{ac} (A_i)_{cb}
$$
Thus, $[{\bf A} , {\bf B} ] = 0$ is precisely the statement that all components of ${\bf A}$ commute with those of ${\bf B}$.
Let me finally point out that this question is reall... | {
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"tags": "quantum-mechanics, operators, vectors, tensor-calculus, commutator",
"url": null... |
c, homework, ai, connect-four
board[c+2][r+2] == computer_num &&
board[c+3][r+3] == computer_num)
{
if (r == 5 || board[c][r+1] != 0) return c+1; //changed from 3
}
}
}
return 8;
}
/* Function check3_diagRUwin() */
int check3_diagRUwin(int ... | {
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"openwebmath_score": null,
"tags": "c, homework, ai, connect-four",
"url": null
} |
organic-chemistry, nomenclature
Which prefixes count towards alphabetically-naming a compound? Which prefixes don't? All I know is that the numeric prefixes like di- or tri- don't count. Are there any others which don't count either? Simple prefixes (simple substituent groups such as methyl and isopropyl) are arranged... | {
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"tags": "organic-chemistry, nomenclature",
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} |
java, beginner, quiz
public String getQuestion() {
return question;
}
public Answer[] getAnswers() {
return answers;
}
public boolean isCorrect(String answer) {
for(Answer tempAnswer : answers)
if(tempAnswer.getAnswer().equals(answer) && tempAnswer.isCorrect())
... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, beginner, quiz",
"url": null
} |
electromagnetism, momentum, plasma-physics, magnetostatics, magnetohydrodynamics
Title: Conservation of Momentum violation with Lorentz Force Note: I am describing this question using cylindrical coordinates $\hat{r}$, $\hat{\theta}$, $\hat{z}$.
I've been looking into how you could slow down a plasma moving downstream... | {
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"tags": "electromagnetism, momentum, plasma-physics, magnetostatics, magnetohydrodynamics",... |
algorithms, algorithm-analysis, optimization, correctness-proof, permutations
Title: How can we minimize the total distance of cross pairs in an array Suppose we had 2 arrays of the same size with positive numbers and we wanted to pair up the elements of each array such that the total difference between the pairs is m... | {
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"id": 2398,
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"tags": "algorithms, algorithm-analysis, optimization, correctness-proof, permutations",
"url":... |
with all pages! Concise ways to show mathematical relations and operations topic, we can use those kinds of mathematical symbols with names symbols a... ; empty set Greek alphabet letters & symbols, through to impedance, permeance and ratios of circles and more... One quantity from another, e.g but you made it easier t... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9399133498259923,
"lm_q1q2_score": 0.8182860075219466,
"lm_q2_score": 0.8705972818382005,
"openwebmath_perplexity": 1623.9148717840606,
"openwebmath_score": 0.631192684173... |
c++, reinventing-the-wheel, memory-management, c++20
So you cast your pointer to a header_t pointer, and then do a copy. The problem? You didn’t make sure that the ALIGNMENT of what payload points to matches the alignment of a header_t. If you’re not lucky, when you try to copy hdr into *hdr_ptr, it’s going to trigger... | {
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"tags": "c++, reinventing-the-wheel, memory-management, c++20",
"url": null
} |
python, python-3.x
Title: Get methods in module, Python Goal: extract methods/functions defined in module. This excludes:
Imports
Lambda methods
Magic methods
Builtin methods
Class methods
Classes
Non-original definitions (i.e. function assignments, alt_name = orig_fn)
My approach + test below. Any room for improvem... | {
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Back substituting we find
$1=77(5)+12(-32)$
The solution to this congruence is $45$ and $-32 \equiv 45$ (mod 77). What am I failing to do properly as to get the first positive solution?
• You weren't, technically, asked to find the positive solution If $x$ is a solution, then $x+77k$ is a solution, Not clear what yo... | {
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"lm_q2_score": 0.8267117898012104,
"openwebmath_perplexity": 145.68092143254194,
"openwebmath_score": 0.8901332020759583,
"ta... |
botany, taxonomy, nomenclature
4I could include forma in this paragraph, too, but this seems to have greatly fallen out of fashion as a useful rank.
5I've also included the author abbreviations here. They have their own set of rules. Just know they're not technically part of the name, but often included to help avoid ... | {
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"tags": "botany, taxonomy, nomenclature",
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} |
limits function ’ variable... Crucial topics in calculus variable to be continuous from a particular side for functions of variables. Means for a function is a function on a closed interval concept is one the! The paper relationship with limits through our guided examples function 's graph a, there... Right-Angled tria... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759663238371,
"lm_q1q2_score": 0.8152482381700669,
"lm_q2_score": 0.831143045767024,
"openwebmath_perplexity": 352.7097225441085,
"openwebmath_score": 0.82933849096298... |
java, object-oriented, gui, javafx
public InputPane build() {
return new InputPane(this);
}
}
}
MessagePane.java
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.la... | {
"domain": "codereview.stackexchange",
"id": 16360,
"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": "java, object-oriented, gui, javafx",
"url": null
} |
c++, beginner, object-oriented, c++11
When you call operator+= or other methods which reposition the Camera it looks like there are just a few assignment statements for m_position etc and then recalculateRS() which does 2 tiny cross-products and assignments.
Therefore, there is no need to worry about copying during t... | {
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"openwebmath_score": null,
"tags": "c++, beginner, object-oriented, c++11",
"url": null
} |
java, tree, inheritance
if (stack.size() != 1) {
throw new InvalidExpressionException("Not enough operators.");
}
// The single item left on the stack is the root of the tree.
return stack.pop();
}
}
class Number extends Expression {
double number;
public Number(doubl... | {
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"tags": "java, tree, inheritance",
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} |
And it is fast:
1366 found in 0.000911951065063 seconds
### Python Without Strings Attached
Let’s do our arithmetic without string functionality. Then, I’d note that $2^{1000}<10^{1000}$ and so we know that, at most, we're dealing with 1001 digits. So, we can create a routine to multiply 2 by itself 1000 times, main... | {
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"openwebmath_perplexity": 3230.630958870691,
"openwebmath_score": 0.5202064514160156,
"tags":... |
You're right that you count the $5$'s rather than the $2$'s. I guess that either M.B. was just wrong, or they meant that you should take the larger in the sense that $5>2$. A fun way to get an approximate answer is to forget the $\lfloor\rfloor$ signs and then sum the geometric series. So for instance $n!$ has about $n... | {
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"lm_q1_score": 0.9926541728822366,
"lm_q1q2_score": 0.81156871102337,
"lm_q2_score": 0.817574471748733,
"openwebmath_perplexity": 244.96567985226721,
"openwebmath_score": 0.9140164256095886,
"tags"... |
glaciology, glacier, ice
To make matters worse, snow superimposes firn which in turn superimposes ice. This means that in the accumulation area, volume change can result from both a reduction in a snow cover and the firn layer. In the zone near the equilibrium line there can be a loss of both firn and ice. this is als... | {
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"id": 385,
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"tags": "glaciology, glacier, ice",
"url": null
} |
ros-lunar
In a youtube video ( https://www.youtube.com/watch?v=F4bpTU_bdPs ) I saw
<run_depend>message_runtime</run_depend>
was used instead. This worked perfectly fine for me.
What is the difference between the two of them exactly? Thanks in advance.
Originally posted by Fldeg on ROS Answers with karma: 53 on 2018-0... | {
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c#, design-patterns, winforms, mvp
var path = String.Empty;
if (isNewMapping)
{
var filename = view.GetFilename();
if (filename.Equals(String.Empty))
{
filename = String.Format("mapping{0}", DateTime.Now.ToString("MMddhhmmss"... | {
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"tags": "c#, design-patterns, winforms, mvp",
"url": null
} |
randomness, pr.probability, randomized-algorithms
I will think about it though, and post something. Vague intuition is it will need very strenous conditions on both the function and the distribution, and that the additive bound is actually at the heart of it. | {
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} |
solid-state-physics, crystals, lattice-model
$$F_{hk\ell }=\sum _{j=1}^{N}f_{j}\mathrm {e} ^{[-2\pi i(hx_{j}+ky_{j}+\ell z_{j})]}$$
where $(hkl)$ indicates the scattering plane, the index $j$ is summed over each atom in the basis with coordinates $(x_{j},y_{j},z_{j})$ and scattering factor $f_{j}$.
This sum can be zer... | {
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"tags": "solid-state-physics, crystals, lattice-model",
"url": null
} |
newtonian-mechanics, forces, rotational-dynamics, torque, statics
What if the part of phone that is off table has no uniform mass distribution then how normal force distribute over part on the table or on very small element ( dx.dy ) of phone ?
How we know that there is or not any rotational orientation case of phone... | {
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"tags": "newtonian-mechanics, forces, rotational-dynamics, torque, statics",
"url": null
... |
c++, c++11, reinventing-the-wheel
using std::size_t; // don't do this in a header!
As noted in the comment, don't put standard library identifiers into the global namespace - just write the type in full throughout the interface.
Don't use a null pointer for an empty string. That's going to result in a lot of specia... | {
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"tags": "c++, c++11, reinventing-the-wheel",
"url": null
} |
ros, ros3djs, robotwebtools
Originally posted by Kurt Leucht with karma: 486 on 2014-06-25
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by JWest on 2014-06-26:
Thanks for the reply, your points are all very valid.
Since it is an educational platform, I am willing to trade high... | {
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• hY2 = 0 indicates that there is not enough evidence to suggest that y2 is trend stationary. This is the correct decision since y2 is difference stationary by construction.
• hY4 = 0 indicates that there is not enough evidence to suggest that y4 is trend stationary. This is the correct decision, however, the Dickey-F... | {
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"openwebmath_score": 0.7597774863243103,
"tags":... |
javascript, http, windows, batch
Second : If you want to hide the output of the console you can redirect it to NUL
for example : reg add "HKEY_CURRENT_USER\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d %savedest% /f>nul
And this line too : timeout /t 1 /nobreak>nul
Third : Refer to How to force Windows desktop bac... | {
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"tags": "javascript, http, windows, batch",
"url": null
} |
java, android, factory-method
Title: Enforce what is passed to an activity in an intent similar to the newInstance pattern for fragments For fragments I have this code to create a new instance:
public static FoodDetails newInstance(Food food) {
FoodDetails foodDetails = new FoodDetails();
Bundle args = new Bun... | {
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"tags": "java, android, factory-method",
"url": null
} |
ros, microcontroller, ros-control, ros-kinetic, ros-controllers
<rosparam file="$(find my_6dof_robot_control)/config/my_6dof_robot_effort_control.yaml" command="load" />
<node name="controller_spawner" pkg="controller_manager" type="spawner" respawn="false" ns="/my_6dof_robot_robot"
output="screen" args... | {
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"tags": "ros, microcontroller, ros-control, ros-kinetic, ros-controllers",
"url": null
} |
programming-languages, real-time
Naively, though, my immediate thought was, "Huh? All imperative languages include the notion of time. Only declarative or functional programming languages could be said to exclude the notion of time, and only by certain specific interpretations."
I think there is a valid point being ... | {
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"tags": "programming-languages, real-time",
"url": null
} |
distributed-systems, partial-order, clocks, ordering
A sends {1,SYN} to B
B updates its counter: LC(B)=max(0,1)+1=2
B increments its counter: LC(B)=2+1=3
B sends {3,SYN/ACK} to A
A updates its counter: LC(A)=max(1,3)+1=4
A increments its counter: LC(A)=4+1=5
A sends {5,ACK} to B
B updates its counter: LC(B)=max... | {
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"tags": "distributed-systems, partial-order, clocks, ordering",
"url": null
} |
ros, camera, depth
Title: Getting the picoflexx depth sensor working on ROS [solved]
Hi,
I'm trying to get the picoflexx depth sensor working with ROS Indigo on Ubuntu 14.04.
I can run the normal royaleviewer.sh from the official package "libroyale-1.0.5.40-LINUX-64Bit", and the depth camera is working fine.
Then I t... | {
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} |
Arithmetic Operators in C++
C++Server Side ProgrammingProgramming
C++ has 5 basic arithematic operators. They are −
• Addition(+)
• Subtraction(-)
• Division(/)
• Multiplication(*)
• Modulo(%)
Example
These operators can operate on any arithmetic operations in C++. Lets have a look at an example −
#include <iostr... | {
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"openwebmath_score": 0.22909702360630035,
"... |
algorithms, correctness-proof, concurrency, first-order-logic, mutual-exclusion
$Lemma10.5.3.1(c)=\forall p,q,j.\big(comp(p, c, j)\land c'pc_p=cf \land (comp(q, c, j)\land q\neq p\land q\in c'S(p) )\big)\Rightarrow c'turn(j)\neq p$
% PROVED.
The problem:
I'm facing difficulties in proving 10.5.3.2 and 10.5.4 because, ... | {
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"tags": "algorithms, correctness-proof, concurrency, first-order-logic, mutual-exclusion",
"ur... |
fluid-dynamics, waves, acoustics
Possibly even odder, this effect still happens without the lid on.
Also, it does not matter where you hit the jar: the bottom, the lid or on the curved side. (Thus, it is not vibrating like a drum). It also does not matter if you touch the surface you hit (or even grip the whole thing... | {
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"tags": "fluid-dynamics, waves, acoustics",
"url": null
} |
c++, beginner, c++11, random, clustering
};
#endif //CLUSTERGEN_H
clustergen.cpp
#include "clustergen.h"
#include <sstream>
#include <iostream>
#include <chrono>
#include <random>
// Default everything
cluster_set::cluster_set(void) {
this->file_out_str = "clustergen_out.dat";
this->file_rpt_str = "clusterg... | {
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} |
Table 2. Find moment of inertia of a uniform hollow cylinder Home Problems and Answers Classical Mechanics Find moment of inertia of a uniform hollow cylinder We know that the moment of inertia for hoop with radius R is mR2. A solid cylinder of mass M = 8 kg M = 8 \text{ kg} M = 8 kg with homogeneous density has a circ... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9919380089483865,
"lm_q1q2_score": 0.8470285215101608,
"lm_q2_score": 0.8539127585282744,
"openwebmath_perplexity": 205.88164116530058,
"openwebmath_score": 0.7360675930976868,
"tags": null... |
Evaluating the same for the n-th power of the matrix gives the number of ways to subdivide a 3x(n+1) grid:
$$\begin{pmatrix} 1 & 1 & 1 & 1 \end{pmatrix} \begin{pmatrix} 8 & 2 & 2 & 1 \\ 2 & 4 & 1 & 1 \\ 2 & 1 & 4 & 1 \\ 1 & 1 & 1 & 2 \end{pmatrix}^n \begin{pmatrix} 1 \\ 1 \\ 1 \\ 1 \end{pmatrix} = 4, 34, 322, 3164, 31... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9766692325496974,
"lm_q1q2_score": 0.8095990359449666,
"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 900.3227475647974,
"openwebmath_score": 0.609265923500061,
"tags... |
quantum-field-theory, special-relativity, quantum-spin, fermions, classical-field-theory
to be the spin operator, with $S^{i0}$ having $\frac{1}{2}\sigma^i$ on its diagonal. But I know that for indices, say, $\rho=i, \sigma=0$, this is a boost, not a rotation.
Is my analysis correct? Equation (3) seems to give the cor... | {
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"tags": "quantum-field-theory, special-relativity, quantum-spin, fermions, classical-field-... |
c#, performance
#endregion
} For faster searching and since you're searching by different properties, one way would be a different dictionary for each property you want to search for. The indexing property is the key and the value can be the tablerowinfo object or if indexes may be duplicated a list of tablerowinfoinf... | {
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quantum-mechanics, visible-light
I also wonder what the effective size of the scattering cross-section of a molecule to absorb a photon of an appropriate wavelength will be. Is it more in the order of the size of the molecule, or more in the order of the geometric mean between the wavelength and the size of the molecu... | {
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beginner, sorting, rust
if movie.year >= val {
return false;
}
}
LogicFilter::GT(val) => {
... | {
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} |
autonomous-vehicles, decision-theory
Alternatively, the car could continue traveling forward, processing the situation. (Similar to a humans thinking distance). The person may continue to move, either out of the way, or still into danger of being hit. In this case, the car may decide to change lanes in an attempt to p... | {
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"openwebmath_score": null,
"tags": "autonomous-vehicles, decision-theory",
"url": null
} |
c#, winforms, pdf
if (field != null || script != null)
{
ProcessPdf(currentFile, field, script);
}
else
{
MovePdfToOutput(currentFile);
}
progress.Rep... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "c#, winforms, pdf",
"url": null
} |
c#, beginner, game
Look at how much easier to understand my version is compared to yours. Anyone, even a non-coder, could look at this thing and just read it like English. "while the turn is less than or equal to the maximum turns, prompt the user for input, then read the line from the console, then validate the inp... | {
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"url": null
} |
can be found by changing all the rows into columns or vice versa. In this case, we swap the row-element with the column-element or vise versa. %���� returns the nonconjugate transpose of A, that is, interchanges the row and column index for each element.If A contains complex elements, then A.' Now note that (AB)x ⋅ y =... | {
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"lm_q2_score": 0.8519528000888387,
"openwebmath_perplexity": 666.9727281791387,
"openwebmath_score": 0.4738052785396576,
"... |
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