text stringlengths 1 1.11k | source dict |
|---|---|
ds.algorithms, time-complexity, computing-over-reals, computable-analysis
Title: Complexity of computing the discrete Fourier transform? What is the complexity (on the standard integer RAM) of computing the standard discrete Fourier transform of a vector of $n$ integers?
The classical algorithm for fast Fourier transf... | {
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ros-melodic, rosparam, roscpp
Originally posted by gvdhoorn with karma: 86574 on 2020-10-20
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by d.fenucci on 2020-10-20:
Yes, that works! Many thanks | {
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redox
Title: Reduction and Oxidation - Alternate definitions Why is reduction defined as the gain of hydrogen?
Is it because hydrogen has a very low electronegativity and easily donates its electrons to other elements? | {
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Use arrayfun - Method 1
The next two methods use arrayfun to do the work. Here's the first approach.
dbtype coloncatarrf1
1 function x = coloncatarrf1(start, stop)
2 % COLONCAT Concatenate colon expressions
3 % X = COLONCAT(START,STOP) returns a vector containing the values
4 % [START(1):STOP(1)... | {
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"tags":... |
arduino, rosserial
Title: Using rosserial for a ATmega168/Arduino based motorcontroller
I once again tried to use rosserial for a Atmega168 based microcontroller (this one). As described in the manual of the microcontroller, one should set the Arduino IDE to use the "Nano with ATmega168" setting. Flashing for example... | {
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} |
string-theory, quantum-computer
And that is simply not achievable at this point. People get excited e.g. if they have a model in which one of the "quarks" is much heavier than all the others (resembling the relationship of the top quark to the other quarks in the real world). You might demonstrate that by showing that... | {
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"tags": "string-theory, quantum-computer",
"url": null
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java, algorithm, sorting, radix-sort
fromIndex,
toIndex);
}
/**
* Performs the counting sort on {@code array[fromIndex ... toIndex - 1]}.
*
* @param array the array to sort.
* @param buffer the buffer array.
* @param counterMap the counter ... | {
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"tags": "java, algorithm, sorting, radix-sort",
"url": null
} |
collections, c++20, circular-list
/**
* @param[in] other Queue to copy.
*/
template<std::copyable T, typename Allocator>
constexpr auto gto::cqueue<T, Allocator>::operator=(const cqueue &other) -> cqueue&
{
cqueue tmp(other);
swap(tmp);
return *this;
}
/**
* @param[in] num Element position.
* @return ... | {
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} |
# Math Help - Determine is a line is tangent to a curve or not?
1. ## Determine is a line is tangent to a curve or not?
Sorry if it sounds silly but I am thinking if there is a way to find out if a line is a tanget of a curve?
Say given a curve of $x^2 + 3xy + y^2 + 4 = 0$, how do I determine if any one given line i... | {
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"openwebmath_score": 0.6978723406791687,
"ta... |
MATLAB to find an LV-factorization of
- I
- I 2
[~
(a) A =
o
~]
M ATL AB. delermine a ]lO.~ itive integer I so thnt (/ I - A) is singu lar.
MLS. USing
7 MLJ. Sol,'c thc lincar systcm in E)(amp lc 2 in Section 2.5. u ~ ing lupr. forsub. and bk.~uh in M ATLAB. Check your LV -factorization. using Example 3 in Sec... | {
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"lm_q1_score": 0.97737080326267,
"lm_q1q2_score": 0.8080039639783043,
"lm_q2_score": 0.8267117876664789,
"openwebmath_perplexity": 4465.94787859596,
"openwebmath_score": 0.8407867550849915,
"tags": null,
... |
php, http, php5, cache, session
return $this;
}
/**
* Sets a custom path for the cache file
* Normally this is left as the default
*
* @param $cachePath
*
* @return $this
*/
public function setCachePath($cachePath)
{
if( ! file_exists($cachePath) || ! is_writ... | {
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"tags": "php, http, php5, cache, session",
"url": null
} |
particle-physics, angular-momentum, standard-model, quantum-chromodynamics, quarks
The $\Delta$ particles are instable (with very short lifetime)
and have masses around $30$% larger than proton/neutron.
(See this and this question about why the mass is larger.) | {
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"tags": "particle-physics, angular-momentum, standard-model, quantum-chromodynamics, quarks... |
sleep
Sleep starts are common physiological phenomenon affecting up to 70% of the adult population and their course is benign, resolving without any neurological sequel. Therefore, reassurance and counselling are all that is needed to treat the patient. Though an adequate explanation and reassurance may be sufficient,... | {
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"tags": "sleep",
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star, planet
There doesn't appear to have ever been a need, and to be honest, I can't think of any need for one. When it was assumed (in historical times) that we were on the only planet, stars were not thought to have planets. The title worked then. Now, as we know most stars are likely to have planets as part of nor... | {
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"tags": "star, planet",
"url": null
} |
photons, atomic-physics, two-level-system
Is this a reasonable conceptual explanation of Rabi splitting?
Is Rabi splitting a "real" effect in the sense that, if one coupled two states in an atom (say $|1\rangle$ and $|2\rangle$) and then tried to probe one of the states by doing spectroscopy from another state (i.e. c... | {
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"tags": "photons, atomic-physics, two-level-system",
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} |
python, python-3.x, pathfinding
Node = Any
Edges = Mapping[Node, float]
Graph = Mapping[Node, Edges]
def dijkstra(graph: Graph, start: Node, goal: Node) -> Tuple[float, List]:
"""
Find the shortest distance between two nodes in a graph, and
the path that produces that distance.
The graph is defined a... | {
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"tags": "python, python-3.x, pathfinding",
"url": null
} |
python, django
values = {}
for type, value in types.items():
if type not in values:
values[type] = value / percent * 100
return values
I'm creating a django
You probably mean that you're creating a web application on top of Django.
Given this code:
items = []
for vote in choice.vote_set.... | {
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c++, integer
// increment and decrement operators
HugeInt& operator+=(const HugeInt&);
HugeInt& operator-=(const HugeInt&);
HugeInt& operator*=(const HugeInt&);
// HugeInt& operator/=(const HugeInt&); TODO:
HugeInt& operator++(); // prefix
HugeInt operator++(int); // postfix
HugeInt& o... | {
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"url": null
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machine-learning, neural-network, overfitting, generalization
You model is likely to overfit if you don't train it carefully, as the model is quite complicated, while the input has few features, which means the mapping might be relatively simpler.
Though it increases the complexity and computational costs, it might n... | {
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"openwebmath_score": null,
"tags": "machine-learning, neural-network, overfitting, generalization",
"url": null
} |
statistical-mechanics, temperature
Title: Temperature of a System of molecules Suppose I have a closed system with N molecules in it which are vibrating and all motion equations (rotation, translation and vibration) of the system are known along with any EM field equations in the region. Given all these information ho... | {
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"tags": "statistical-mechanics, temperature",
"url": null
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python, beginner, python-3.x, calculator, community-challenge
My division rounds up if it isn't an integer
but this doesn’t seem to be true. For example, if I enter 2/3 then I get output 0.
There is no need for getPriorizedOperators to be a function. Just declare the list as a variable in operator.py, then import it ... | {
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newtonian-mechanics, rotational-dynamics, reference-frames, inertial-frames, machs-principle
It seems to me that one of them will be experiencing more blood in their extremities, and that if they make themselves into a ball they will spin faster vs. the other astronaut will not experience any such effect, but will obs... | {
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# Questions tagged [asymptotics]
Questions about asymptotic notations and analysis
1,032 questions
Filter by
Sorted by
Tagged with
23 views
### Big-O notation for the given function whose runtime complexity grows faster than the input
I struggle to determine the runtime complexity of a function I thought of while t... | {
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### The Algorithm
These considerations lead to the following simple algorithm to generate one realization of the desired distribution:
Let U ~ Uniform(0,1+p)
If (U < 1-p) then m = 2 else m = 3
x = 0
While (m > 0) {
x = x + 1
Let Z ~ Bernoulli(1-p)
m = m - Z
}
Return x-1
These histograms show simulations (based on 1... | {
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"openwebmath_score": 0.7729891538619995,
"tag... |
and 16 singular tangent planes and was published in 1864. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. I was later advised by an acquaintance, John Del Grande, that my solution was incomplete. We construct the tangent PJ from the... | {
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"lm_q1q2_score": 0.8141548285399918,
"lm_q2_score": 0.8267117962054048,
"openwebmath_perplexity": 327.0464077360838,
"openwebmath_score": 0.6351319551467896,
"tags"... |
beginner, algorithm, rust
prep
}
fn count_sort(p: &mut Vec<usize>, c: &[i32]) {
let n = &p.len();
let mut cnt = vec![0; *n];
for idx in 0..c.len() {
cnt[c[idx] as usize] += 1;
}
let mut p_new = vec![0; *n];
let mut pos = vec![0; *n];
for idx in 1..*n {
pos[idx] = pos[idx - ... | {
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"tags": "beginner, algorithm, rust",
"url": null
} |
ir-spectroscopy
This is a phenomenological description, in a quantum description the probability of absorbing energy and moving from one vibrational level (stationary state) to another is proportional to the square of the strength of the radiation's electric field $\epsilon$ and the square of the transition moment $M$... | {
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"id": 10713,
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"tags": "ir-spectroscopy",
"url": null
} |
1, the smaller the component 1, the larger y -- the interpretation is the same. Possibly, the easiest way to see that is to use a biplot. library( pca3d ) pca2d( pca1, biplot= TRUE, shape= 19, col= "black" ) shows The same biplot for the second variant shows pca2d( pca2$scores, biplot= pca2$loadings[,], shape= 19, col=... | {
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"lm_q1q2_score": 0.809938506519466,
"lm_q2_score": 0.8438951064805861,
"openwebmath_perplexity": 1634.5806206692748,
"openwebmath_score": 0.6481835842132568,
"tag... |
asymptotics
How to calculate the time complexity of this code in big-$\mathcal{O}$ notation? I already define the recurrence function, which is
\begin{equation}
T(p) =
\begin{cases}
1, & \text{if}\ p=0 \\
T(p/2) + 1, & \text{if } p \text{ is even} \\
T(p-1) + 1, & \text{if } p \text{ is odd}
\end{cases}
\end{equ... | {
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"tags": "asymptotics",
"url": null
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complexity-theory, np-complete, reductions, np-hard, np
What about the constraints? In set cover, we want to find some sets the union of which will cover all elements. In simple party invitation, we want to find some persons to invite so that every lists of people will be covered, that is, there is at least one person... | {
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"tags": "complexity-theory, np-complete, reductions, np-hard, np",
"url": null
} |
computability, turing-machines, closure-properties, nondeterminism
Title: Decidable languages kleene star closure - question on a proof I read a proof on the closure of decidable languages under kleene star. It begins by saying that the turing machine we want to find would non-determistically split the input string an... | {
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"openwebmath_score": null,
"tags": "computability, turing-machines, closure-properties, nondeterminism",
"url": null
} |
newtonian-mechanics, forces, charge, acceleration
The elevator also has an acceleration of $0$, so we know that the net force on it must be $0$, so $T = 10000 + N$. But we know from our analysis of the person that $N=100$ Newtons. Therefore $T=10100$ Newtons. This makes intuitive sense, because the wire must support t... | {
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"openwebmath_score": null,
"tags": "newtonian-mechanics, forces, charge, acceleration",
"url": null
} |
cooling, air
If the pads of an evaporative air cooler were to be replaced with a coil, as you ask, there is nothing to evaporate. The only way for such a system to work is to turn the evaporative air cooler into a refrigerative air conditioner (also known as a reverse cycle air condition or a heat pump). This defeats ... | {
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"id": 2180,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "cooling, air",
"url": null
} |
electromagnetism, magnetic-fields, polarization
Title: Are the $H$ and $M$ fields parallel? I would like to know if the $H$ and $M$ fields are always in the same (or opposite) direction. If not, are there special conditions where it is always true? The relationship between $\mathbf H,\mathbf M,$ and $\mathbf B$ is
$$\... | {
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"tags": "electromagnetism, magnetic-fields, polarization",
"url": null
} |
Notice: Undefined index: avatar in /home/customer/www/mathsgee.com/public_html/qa-theme/AVEN/qa-theme.php on line 993
In the $x y$ -plane, the line tangent to the graph of $x^{2}+x y+y^{2}=3$ at the point $(1,1)$ has a slope of
In the $x y$ -plane, the line tangent to the graph of $x^{2}+x y+y^{2}=3$ at the point $(1,1... | {
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"openwebmath_score": 0.7781865000724792,
"tags": n... |
$$e^{3}e^{-j\frac{\pi}{4}}=e^{3}(\cos(-\pi/4)+j\sin(-\pi/4))=e^{3}\frac{\sqrt{2}}{2}-je^{3}\frac{\sqrt{2}}{2}.$$ Real part: $e^{3}\frac{\sqrt{2}}{2}$
Imaginary part: $-e^{3}\frac{\sqrt{2}}{2}$ (you forgot the minus sign and the $e^{3}$ factor). | {
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"lm_q1_score": 0.9883127423485423,
"lm_q1q2_score": 0.8103110247258668,
"lm_q2_score": 0.8198933293122506,
"openwebmath_perplexity": 373.0582229415394,
"openwebmath_score": 0.9296526312828064,
"tag... |
botany
Plants in temperate climates care about seasons a lot. We put them in greenhouses and we play with their light, in order to force off-season flowering. Tomatoes are kept in the greenhouse not because we don't like them shivering outside, but because we want to fool their temperature-sensing organs that summer i... | {
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"tags": "botany",
"url": null
} |
double-slit-experiment
The spacing of the "red" pattern is a bit wider than the spacing of the "blue" pattern because the wavelengths of "red" light are longer than "blue" light. That's why the outer edges of the fringes are reddish and the inner edges are blueish. The farther you get from the center fringe, the mor... | {
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"openwebmath_score": null,
"tags": "double-slit-experiment",
"url": null
} |
oscillators, differential-equations
Title: What happens to the position function when an oscillator is overdamped and does not have angular frequency? My question is simple: What happens to the behavior of the position function, $x(t)$, when an oscillator is overdamped and $\omega$ does not exist?
Here's the backgrou... | {
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"tags": "oscillators, differential-equations",
"url": null
} |
python
#Sort combinations descending by remaining length, get solution
combs = sorted(combs, key=lambda k: k['Rest'])
res.append(getSolution(reqs, combs))
#Sort combinations by getting biggest lengths first (largest to smallest), optimal pieces first, get solution
listreq = sorted(listreq, reverse=Tru... | {
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"tags": "python",
"url": null
} |
c#, unit-testing, linq, assertions
Ok, so all calls to other methods are some that exist already, so I haven't written any of those, but instead trying to make use of them.
tooltipRows will always contain a list. It's empty if no rows were found.
tooltipFieldTextControl will have null assigned if no text control was f... | {
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"openwebmath_score": null,
"tags": "c#, unit-testing, linq, assertions",
"url": null
} |
signal-analysis, continuous-signals
Title: What's the point of defining the signal over the whole time domain? This question is classic for anyone starting with some signal processing course, suppose $y(t)=x(t/2)$ then the system is noncausal because we have that the output at t=-6 depends on the input at t=-3 which i... | {
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"tags": "signal-analysis, continuous-signals",
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} |
performance, c, palindrome
if(__exist(root, n_el->string, i+j+1)) continue;
root = _add(root, n_el);
}
tmp = tmp->next;
i++;
}
return( _ncptr( v, quant-1, root, _count(root)-count ) );
}
else {
//MAYBE IT's FIRST CALL OF THE FUNCTION
... | {
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"tags": "performance, c, palindrome",
"url": null
} |
big-o-notation, master-theorem
Title: Why not $O(n^{\log_ba})$ for case 1 of the Master Theorem instead of $O(n^{(\log_ba) - \epsilon})$? Someone who was explaining to me the master theorem said that for the case 1, we compare the $n^{\log_b(a)}$ and $f(n)$. If the growth rate of $n^{\log_b(a)}$ is greater than the gr... | {
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"tags": "big-o-notation, master-theorem",
"url": null
} |
co.combinatorics, boolean-functions, fourier-analysis
Yes it is vacuous, but if you use the stronger bound you get something nontrivial for large $\epsilon$, of course for fixed $k$ you also have interesting things, it's just the estimates in the book lose too much.
Better bounds are known (thanks ot Yuval) : http://d... | {
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Let us consider an example here to facilitate understanding. Let . Then,
Solving can be done with the p-q-formula: is equivalent to
Consequently, our eigenvalue candidates are and . To find the eigenvectors, we have to solve the equation system: for , . Clearly, you can see that this matrix does not have full rank an... | {
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"tags": n... |
while 0.2 is an approximation for the 64-bit floating point binary number
0 01111111100 1001100110011001100110011001100110011001100110011010
which are the two numbers being subtracted. The result of the subtraction is
0 01111111011 1001100110011001100110011001100110011001100110011000
which has an approximate ... | {
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"openwebmath_score": 0.3675270676612854,
... |
ros, ros-melodic, base-odometry
Originally posted by Dragonslayer on ROS Answers with karma: 574 on 2020-02-02
Post score: 0
SOLVED: Was an ugly mixup in the microcontrollers PID/drivers/serialinterface. For anybody else encountering such an issue I would suggest, measure the wheelspeeds/steerangles exact (not by ros... | {
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"tags": "ros, ros-melodic, base-odometry",
"url": null
} |
cnn, hyperparameter-tuning, grid-search, gridsearchcv, finetuning
Title: CNNs - Hyperparameter tuning with different training sizes of the same data set I would like to compare how much the classification performance (test accuracy) of CNNs changes depending on the size of the data set.
For this I would like to use a ... | {
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"tags": "cnn, hyperparameter-tuning, grid-search, gridsearchcv, finetuning",
"url": nu... |
.net, vb.net
Title: Checking datasets for tables and rows Is there a cleaner way of checking a dataset for tables/rows before attempting to read them?
If ds.Tables.Count > 0 Then
If ds.Tables(0).Rows.Count > 0 Then
'do something with the the rows at this point
End If
End If
Edit to clarify - I am ta... | {
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"tags": ".net, vb.net",
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} |
-
+1: Hadn't seen this before. – Aryabhata Nov 23 '10 at 23:49
Try proving this statement: Claim: If $f(n) = f(n-1)+f(n-2)$, then $f(n) = F_n f_1 + F_{n-1} f_0$.
Now "fix" $m$ and think of $F_{n+m}$ as a linear recurrence in $n$ with initial conditions $F_{m+1}$ and $F_m$.
By the way, there is a short and clean proo... | {
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"openwebmath_score": 0.8907322287559509,
"tags": null,
"url"... |
c++, object-oriented, c++14, networking, wrapper
int TelnetClient::sendAll(const char *buffer, size_t size) {
int retVal = -1; // default value
// send data
while (size > 0) {
retVal = send(mSockFd, buffer, size, 0);
if (retVal == 0 || errno == EINTR) {
// try again
continue;
} else if ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, object-oriented, c++14, networking, wrapper",
"url": null
} |
polarization, microwaves
Title: How could I build a polarizer for 12GHz electromagnetic waves? I have built a gadget that can make pictures using ambient 12GHz radiation.
The nature of the parts I used (commonly available satellite TV parts) means that I have selectable polarization on the receiver. I have therefore... | {
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"openwebmath_score": null,
"tags": "polarization, microwaves",
"url": null
} |
algorithms, sets
To construct an instance of your problem from the Maximum Clique Instance: Create a song $s_{uv}$ for every edge $(u, v)$ in $E$, and an instrument $t_v$ for every vertex $v$ in $V$, and make song $s_{uv}$ require the two instruments $t_u$ and $t_v$. Set $K$ (part of the input to your problem) equal ... | {
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"openwebmath_score": null,
"tags": "algorithms, sets",
"url": null
} |
Therefore the solution is
$$a=4, \quad b= \cos\left( \frac 5 {18} \pi\right), \quad c=\cos\left( \frac {17} {18} \pi\right), \quad d=\cos\left( \frac {29} {18} \pi\right). \qquad \blacksquare$$
Hi I like Serena, WOW! Thank you kindly for this piece of well thought out strategic plan to tackle this cubic function!
I am... | {
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"lm_q2_score": 0.8244619306896956,
"openwebmath_perplexity": 1258.5710153631562,
"openwebmath_score": 1.0000100135803223,
"t... |
python, optimization, performance, primes, sieve-of-eratosthenes
# All multiples of 2 are not prime numbers, except for 2 itself:
sieve[4::2] = (limit / 2 - 1) * [0]
for prime in xrange(3, test_max, 2):
if sieve[prime]:
# If the number hasn't been marked a composite, it is prime.
... | {
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9. Drinking a milkshake The truncated conical container shown here is full of strawberry milkshake that weighs 4/9 oz/in^3 . As you can see, the container is 7 in. deep, 2.5 in. across at the base, and 3.5 in. across at the top (a standard size at Brigham’s in Boston). The straw sticks up an inch above the top. About h... | {
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"lm_q1_score": 0.9879462183543603,
"lm_q1q2_score": 0.8030691971601901,
"lm_q2_score": 0.8128673223709251,
"openwebmath_perplexity": 2058.0020103718,
"openwebmath_score": 0.796732485294342,
"tags": null,
... |
slam, navigation, octomap, rgbdslam-freiburg, octomap-server
EDIT 05/28/14 +1h: The issue lies in the transform. /map is not present in my frames.pdf view. Not sure how to solve this problem either.
EDIT 06/04/14: Solved building octomap using rgbdslam data by recording a .bag file, launching octomap_server, and viewi... | {
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"tags": "slam, navigation, octomap, rgbdslam-freiburg, octomap-server",
"url": null
} |
Can every element of a group be written as the product of two non-identity elements of the group?
By part of the definition,
two elements in a group can be put together with the group operation to obtain a third element that is also an element of the group.
However, I am wondering if the converse is also true. So th... | {
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"openwebmath_score": 0.8160947561264038,
"tags"... |
python, python-3.x, numpy, combinatorics
import numpy as np
from numbers import Real
def cartesian_product(*arrays: np.ndarray) -> np.ndarray:
"""
See
https://stackoverflow.com/questions/11144513/cartesian-product-of-x-and-y-array-points-into-single-array-of-2d-points
"""
la = len(arrays)
dtyp... | {
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"tags": "python, python-3.x, numpy, combinatorics",
"url": null
} |
java, php, security
Generally the level calculation is performed on bits or even values (where the hash value, when seen as a unsigned number, is below a certain value).
As for performance: you can stop comparing whenever you encounter a number that doesn't have the right level. It won't matter much when compared the ... | {
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"openwebmath_score": null,
"tags": "java, php, security",
"url": null
} |
recurrence-relation
Title: How to calculate the time complexity of a Catalan-like recurrence by substitution? I was given the following problem:
Calculate the computational time complexity of the recurrence $$P(n) = \begin{cases} 1 & \text{if } n = 1 \\ \sum_{k=1}^{n-1} P(k) P(n-k) & \text{if } n \geq 2 \end{cases}$$... | {
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"openwebmath_score": null,
"tags": "recurrence-relation",
"url": null
} |
And actually it is not me posting the question in another forums. After reading your comment, I tried to google it and it surprised me this question has been asked by so many students, including here (although it had not been answered yet)
Maybe I should google my question first. I depend too much on PF :tongue:
Ther... | {
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"openwebmath_score": 0.5086212158203125,
"tag... |
ros, cmake, dependencies
## Generate messages in the 'msg' folder
# add_message_files(
# FILES
# Message1.msg
# Message2.msg
# )
## Generate services in the 'srv' folder
# add_service_files(
# FILES
# Service1.srv
# Service2.srv
# )
## Generate actions in the 'action' folder
# add_action_files(
# FILES... | {
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} |
cell-biology, proteins, human-genetics, cancer, mutations
RAS (this is the same for all three RAS family members) needs to be activated so it can signal downstream, this happens, when GTP is bound to the protein. Since permanent activation is obviously not a good idea, RAS itself has an intrinsic, but slow GTPase acti... | {
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"tags": "cell-biology, proteins, human-genetics, cancer, mutations",
"url": null
} |
java, object-oriented, multithreading, javafx, network-file-transfer
}
public void loadDownlaodPartMetadatas(List<DownloadPartMetadata> downloadPartMetadatas) {
for (DownloadPartMetadata downloadPartMetadata : downloadPartMetadatas) {
ConcurrentLinkedQueue queueCom = new ConcurrentLinkedQueue(... | {
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"tags": "java, object-oriented, multithreading, javafx, network-file-transfer",
"url":... |
acid-base, experimental-chemistry, ph
Adding a little water here or there doesn't really change the pH at the equivalence point, because ideally there are no moles of acid or base present in solution.
The reason this doesn't mess up your measurement for the concentration is because you measured the volume of titrand b... | {
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"openwebmath_score": null,
"tags": "acid-base, experimental-chemistry, ph",
"url": null
} |
c++, algorithm, graph, depth-first-search, breadth-first-search
}
node& at(point pnt){
return nodes[pnt.x][pnt.y];
}
point size(){
return {rows, cols};
}
~GRAPH(){
for(size_t i = 0; i < rows; i++)
delete nodes[i];
delete[]nodes;
}
}; | {
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"tags": "c++, algorithm, graph, depth-first-search, breadth-first-search",
"url": null... |
The capacitance is then
$$C = \frac{Q}{V} = \frac{1}{\frac{L/2}{A\kappa\epsilon_0} + \frac{L/2}{A\epsilon_0}} = \frac{1}{\frac{1}{C_1}+ \frac{1}{C_2}}$$
which is the formula for series connected capacitors. | {
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"openwebmath_score": 0.7865023016929626,
"tags... |
ros, navigation, ros-melodic, ros-kinetic, vslam
Title: Best VSLAM Algorithm for Outdoor Navigation
Hello, I am building an outdoor robot and would like to know what is the most suitable algorithm of visual SLAM for outdoor robot navigation using ROS.
Originally posted by Nabil Miri on ROS Answers with karma: 1 on 2... | {
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"tags": "ros, navigation, ros-melodic, ros-kinetic, vslam",
"url": null
} |
collections, c++20, circular-list
/**
* @return true = an element was erased, false = no elements in the queue.
*/
template<std::copyable T, typename Allocator>
constexpr bool gto::cqueue<T, Allocator>::pop() {
if (mLength == 0) {
return false;
}
std::allocator_traits<allocator_type>::destroy(mAllocator, m... | {
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"openwebmath_score": null,
"tags": "collections, c++20, circular-list",
"url": null
} |
ros, intel, ros-kinetic
Original comments
Comment by allenh1 on 2019-04-25:
@rukie Depending on what ros distro you are using (and also which packages you are using), you can potentially use Python3 in your setup with ROS 1 and not run into too much trouble. You could also try ROS 2, which requires Python 3.
Comment b... | {
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, It is negative acceleration , The object is moving at a uniform deceleration. The graph also shows centripetal force well in to the. What does the slope of a position vs. We can benefit from this graph by two ways. How can you use a speed versus time graph to find an object's acceleration?. Regarding this, what does ... | {
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"openwebmath_score": 0.4911710321903... |
quantum-mechanics, fermions, bosons
the transition rates from the excited states to the ground state will be similar for the two particles. So the transition takes place quickly. There is no Pauli blocking. It might take a long time for the symmetry character of the state to change significantly (because the differenc... | {
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"tags": "quantum-mechanics, fermions, bosons",
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cross-compiling, transform, nao
[rosbuild] Building package bullet
[rosbuild] Including /home/nao/ros-nao/ros/fuerte/share/rospy/rosbuild/rospy.cmake
[rosbuild] Including /home/nao/ros-nao/ros/fuerte/share/roscpp/rosbuild/roscpp.cmake
[rosbuild] Including /home/nao/ros-nao/ros/fuerte/share/common-lis... | {
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"tags": "cross-compiling, transform, nao",
"url": null
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# Trigonometric Values!
$\large{ \sin(40^\circ) < \sqrt{\dfrac{3}{7}}}$
Prove, without using a calculator, that the above inequality holds true.
Note by Satyajit Mohanty
5 years, 5 months ago
This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Expla... | {
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"tags":... |
python, time-limit-exceeded, numpy, statistics
print perc If I understand your question, you are asking to determine the percentile value of the first value that exceeds the threshold. The thing to do is the following:
Specify the number of random.normal deviates in the call and pre-sort the array. That way you can j... | {
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"tags": "python, time-limit-exceeded, numpy, statistics",
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} |
electromagnetism, potential
Now let's connect the spheres. What will happen? Well, a current will flow in the wire. This will take positive charge off of sphere 1 and deposit it on sphere 2 [strictly speaking if you want electrons to be charge carriers, then negative charge is flowing from 2 to 1; but in terms of thin... | {
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"tags": "electromagnetism, potential",
"url": null
} |
special-relativity, energy, mass, momentum, mass-energy
In classical mechanics mass is a property of an object that has to do with its inertia. We could define $m=\frac{F}{a}$.
In classical mechanics an empty battery has the same mass as a full one and a cold kilogram prototype has the same mass as a hot one.
Does thi... | {
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"tags": "special-relativity, energy, mass, momentum, mass-energy",
"url": null
} |
Distance" between two objects is the distance you would expect in "flat" or "Euclidean" space; it's named after Euclid, who worked out the rules of geometry on a flat surface. numpy.linalg.norm(x, ord=None, axis=None, keepdims=False):-It is a function which is able to return one of eight different matrix norms, or one ... | {
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"openwebmath_score": 0.6504970788955688,
"tags":... |
quantum-field-theory, hilbert-space, operators, field-theory, observables
\begin{equation}
\phi(x)|\varphi(x)\rangle = \varphi(x) |\varphi(x)\rangle
\end{equation}
However, in other states, like the ground state (also called the vacuum state) $|0\rangle$, the field does not take on a definite value. There is a superpo... | {
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Thus $\displaystyle P(\text{Bowl 1} \lvert X=3)=\frac{4}{5}$
____________________________________________________________
Answers for Problem 2
Problem 2a
Let $X$ be the number of red balls in the 5 balls chosen random from the unknown bowl.
$E(X)=1.2$
$Var(X)=1.56$
Problem 2b
$\displaystyle P(\text{Bowl 1} \lver... | {
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"lm_q2_score": 0.8244619263765707,
"openwebmath_perplexity": 322.73037006546485,
"openwebmath_score": 0.9832196831703186,
"tags":... |
microbiology, epidemiology, infection, pathogenesis
Title: Why do 6-8% of diphtheria patients do not develop natural immunity after being affected? I am thinking of why some patients do not have natural immunity after exposure to the A-B toxin of diphthria.
I think the A-B exotoxin is the key factor causing this disea... | {
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"tags": "microbiology, epidemiology, infection, pathogenesis",
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} |
c++, csv
//=============================================
// CSVData
//=============================================
void CSVData::AddLine(CSVLine line) { contents.push_back(line); }
unsigned int CSVData::Size() { return contents.size(); }
CSVLine& CSVData::operator[] (int index) {
if(index < contents.size(... | {
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"tags": "c++, csv",
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python, pandas
Title: Pandas filter dataframe on multiple columns wrt corresponding column values from another dataframe I have a pandas dataframe, df1:
a b c d e f
1 1 1 x 1 5
1 1 1 x 1 6
1 1 1 y 1 5
1 1 1 y 1 7
and another dataframe, df2:
a b c d e f
1 1 1 x 1 5
Now I want to filter df1 on columns a, b, c, d if it... | {
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"url": null
} |
fourier-transform, convolution, frequency-response, impulse-response, proof
If there were no delta functions, then this convolution is as difficult to do as it's in the time domain, right?
Thanks =) What you did is correct, and it's absolutely essential that you know and understand that modulation property.
The fact ... | {
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"tags": "fourier-transform, convolution, frequency-response, impulse-response, proof",
"url":... |
experimental-physics, solid-state-physics, plasma-physics
This is not clear to me, as I would think that this explanation would hold for the sputter substrate as well. I would be very glad if someone could make that clear by a somehow intuitive explanation. Thank you for all suggestions. :) First of all, sputtering ca... | {
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"openwebmath_score": null,
"tags": "experimental-physics, solid-state-physics, plasma-physics",
"url": null
} |
decimation, frequency-translation
Title: Reordering frequency translation and decimation I'm trying to understand the behavior of two different methods of decimating and frequency translating a signal. At this point, I'm only swapping the translation and decimation; I'm not doing any polyrate processing. The graphic... | {
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"openwebmath_score": null,
"tags": "decimation, frequency-translation",
"url": null
} |
cosmology, experimental-physics, vacuum, dark-energy, cosmological-constant
Title: By what experiment is the vacuum energy density actually measured? I have heard that the actual vacuum energy density which is up to 120 orders smaller than the predicted QED value can be measured in experiments or cosmological observat... | {
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"tags": "cosmology, experimental-physics, vacuum, dark-energy, cosmological-constant",
"u... |
quantum-mechanics, quantum-optics
Also, you have the scaling of the (collective) coupling strength wrong since it scales as $\sqrt{j}g$. This is because the interaction is ''coherent'', or ''superradiant'', or whatever other names you prefer. To be more specific, the matrix element between $(n+1)$-photon and $0$-atomi... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, quantum-optics",
"url": null
} |
lagrangian-formalism, atomic-physics, notation, atoms, magnetic-moment
Title: What $\mu$ represents in Gryzinski's free fall atomic model equation? When you look into the Gryzinski's atomic free fall model equation (see wiki link here ), it has a variable $\mu$. What it is?
$L = \frac{1}{2} m v^2 + \frac{Ze^2}{r}+\fra... | {
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"tags": "lagrangian-formalism, atomic-physics, notation, atoms, magnetic-moment",
"url": ... |
algorithms, intervals
For example, given this collection {[12,16),[8,13),[16,34)} the result would be {0,1} because interval at index 0 intersects some interval, and interval at index 1 intersects some interval.
I have an algorithm that in worst case performs O(n^2) but can't figure out one that is faster. Mine doesn... | {
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"openwebmath_score": null,
"tags": "algorithms, intervals",
"url": null
} |
the-sun, earth, temperature
Yes! Less of its would be in the visible, transparent part of our atmosphere and more would be in the infrared where the atmosphere is more absorbing.
When the Sun's warmth from above is absorbed in the atmosphere, it is easier for it to radiate that back into space, but climate models are ... | {
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"tags": "the-sun, earth, temperature",
"url": null
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pathology, virology
Can cancers caused due to viruses be contagious? NO
Are these oncoviruses infectious in nature? YES | {
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### Is $n^{1/\log \log n} = O(1)$?
Is $n^{1/\log \log n} = O(1)$ ? Suppose that $n^{1/\log \log n} = c$ where $c$ is constant. Taking logs of both sides, $$\frac{1}{\log \log n}\log n = \log c.$$ I am not able to spot an error. ...
210 views
### Is O((n^2)*log(n)) greater than O(n^(2.5))?
I know that $O(n^2\times \l... | {
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javascript, beginner, datetime, animation, svg
// 11.13 comes from 256/23 with 256 being the max value
// of a rgb value and 23 for the max value of the variable
// hours
var rgbValueHours = Math.round(hours * 11.13)
// 4.339 comes from 256/59 with 256 being the max val... | {
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} |
sedimentology, desert, satellite-oddities
However, Waw al-Namus and its plume are not the only "wind records"
in the area. As you utilise higher resolution images - of the order of
1 km or better, other, somewhat different "long-term wind tracers" are
revealed at almost every place across the Sahara Desert. Thes... | {
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"tags": "sedimentology, desert, satellite-oddities",
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ros, ros-kinetic, laserscan, pointcloud
intensities: [] | {
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"tags": "ros, ros-kinetic, laserscan, pointcloud",
"url": null
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Then, plugging in values of $2,4,6,8,$ we get
$$P(2)-a=(2-1)(2-3)(2-5)(2-7)Q(2) = -15Q(2) = -2a$$ $$P(4)-a=(4-1)(4-3)(4-5)(4-7)Q(4) = 9Q(4) = -2a$$ $$P(6)-a=(6-1)(6-3)(6-5)(6-7)Q(6) = -15Q(6) = -2a$$ $$P(8)-a=(8-1)(8-3)(8-5)(8-7)Q(8) = 105Q(8) = -2a$$
$-2a=-15Q(2)=9Q(4)=-15Q(6)=105Q(8).$ Thus, the least value of $a$ ... | {
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"openwebmath_score": 0.8768100142478943,
... |
• A matrix with two negative eigenvalues can have a positive determinant. To prove that the Hessian is positive semidefinite, one needs more than the determinant. One needs to show that all $2^3 - 1 = 7$ principal minors are nonnegative. All three diagonal entries are nonnegative. The determinant is nonnegative. It rem... | {
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"lm_q1_score": 0.9787126444811033,
"lm_q1q2_score": 0.8069113164593081,
"lm_q2_score": 0.8244619306896956,
"openwebmath_perplexity": 115.62384961786462,
"openwebmath_score": 0.9313000440597534,
"ta... |
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