text stringlengths 1 1.11k | source dict |
|---|---|
machine-learning, scikit-learn, elastic-net
Make model predictions on a sample of records
Select a column, shuffle its values and predict again with the model
Get the the drop (if any) of model performance on this new shuffled dataset VS the initial one
Average this difference across all predictions
Repeat the steps a... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning, scikit-learn, elastic-net",
"url": null
} |
php, sql, database, pdo
<div>
<input type="text" name="dateModified" autocomplete="on" required>
<span data-placeholder="dateModified"></span>
</div>
<div>
<input type="text" name="keywords" class="input100" autocomplete="off" required>
<span data-placeholder="Keywords"></span>
</div>
<div>
... | {
"domain": "codereview.stackexchange",
"id": 32091,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, sql, database, pdo",
"url": null
} |
python, sqlite
I need the code to work fast. If the code appears professional that's definitely a bonus.
print "selecting...",
cur.execute("SELECT \"b\".\"Disposals\" AS \"Disposals\", \
\"a\".\"ASSET NUMBER\" AS \"Record\", \
\"a\".\"DESCRIPTION\" AS \"DESCRIPTION\", \
... | {
"domain": "codereview.stackexchange",
"id": 4325,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, sqlite",
"url": null
} |
ros, python2.7, ros-kinetic, publisher
Originally posted by CuatroPalos on ROS Answers with karma: 16 on 2020-06-10
Post score: 0
Original comments
Comment by Teo Cardoso on 2020-06-10:
I tried your code here and seems to be updating the Yaw variable. What are exactly your goal and your problem with this code?
Commen... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, python2.7, ros-kinetic, publisher",
"url": null
} |
navigation, ros-kinetic, costmap, global-costmap, 2dcostmap
Comment by mzWang on 2018-10-17:
Please see this link: https://answers.ros.org/question/306040/can-i-update-global-map-with-only-one-specific-pointcloud-topic/ | {
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"openwebmath_score": null,
"tags": "navigation, ros-kinetic, costmap, global-costmap, 2dcostmap",
"url": null
} |
image-processing
{$width/4},{$height/4},{d},{s},":begin(
const ww=w#0-1;
const hh=h#0-1;
const nw=w-1;
const nh=h-1;
const sd=max(nw,nh)/min(nw,nh);
const dpi=2*pi;
const cx=.5+$1*.5;
const cy=.5+$2*.5;
const px=cx*nw;
const py=cy*nh;
const rpx=nw-px;
const rpy=nh-py;
);
xpos=x-... | {
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"id": 9756,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "image-processing",
"url": null
} |
chaos-theory
Chaos does imply that, microscopically, the system is not integrable (and thus no long term deterministic predictions of the state are possible), but it does not imply that it can not be described statistically(1), and that its most likely outcome is so probable that the most likely outcome behaves as if ... | {
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"openwebmath_score": null,
"tags": "chaos-theory",
"url": null
} |
black-hole, gravity, supermassive-black-hole, gravitational-waves
So to answer your question, the reason for supermassive black holes to be unable to merge is that they are too close together for there to be any remaining material (stars, gas, etc.) in the center of the galaxy to remove angular momentum from the orbit... | {
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"lm_q2_score": null,
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"tags": "black-hole, gravity, supermassive-black-hole, gravitational-waves",
"url": null... |
As $\epsilon\to0$, we have $\sin\epsilon=\epsilon+o(\epsilon)$ (it's Taylor's formula around $0$, at order $1$), hence, as $n\to\infty$,
$$n\sin\frac\pi n=n\left(\frac\pi n+o(\frac1n)\right)=\pi+o(1)\to\pi$$
For small values of $x$, $\sin x\sim x$. So for large values of $x$, $\sin(1/x)\sim 1/x$. So as $n$ increases,... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9763105245649664,
"lm_q1q2_score": 0.8177771818305404,
"lm_q2_score": 0.8376199592797929,
"openwebmath_perplexity": 242.57310401173356,
"openwebmath_score": 0.9393055438995361,
"ta... |
prove this theorem so that we can use it to find general formulas for products and quotients of functions. No, a counterexample is given by the function Although this function, shown as a surface plot, has partial derivatives defined everywhere, the partial derivatives are discontinuous at the origin. The derivative at ... | {
"domain": "misscarrington.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759621310288,
"lm_q1q2_score": 0.8297646021024566,
"lm_q2_score": 0.8459424373085145,
"openwebmath_perplexity": 284.12264156151207,
"openwebmath_score": 0.8485810160636902,
... |
complexity-theory, turing-machines, time-complexity
A TM $M$ computes a function $f$ in $T(n)$-time if for every $x$, after $M$ is initialized in start configuration on input $x$, using at most $T(|x|)$ steps, $M$ halts with $f(x)$ written on its output tape.
They then define time-constructible functions
A function ... | {
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "complexity-theory, turing-machines, time-complexity",
"url": null
} |
android
.app - Holds app meta-data
.launch - App roslaunch file
.interface - Defines how the app will connect to other apps (I'm not really clear on how this works, sorry).
The necessary files are
App Manager Launch File Example
App Listing File Example
Write a .app, .interface, and .launch file for each app that yo... | {
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"tags": "android",
"url": null
} |
java, mvc, http
Since, you are falling through to the default, you can just omit the other cases completely, and it will still work. After the rest of the review, this will become less relevant, but added here for future reference.
The biggest problem in this method is duplication. Every case statement, and the else ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, mvc, http",
"url": null
} |
javascript
The function does as expected.
But anyway: If someone knows a better way to accomplish the task then please let me know. The same for improvement suggestions. This looks straightforward and solid under ES5. I have no comments or criticism for that.
However, under ES6, there's the spread operator (which is ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript",
"url": null
} |
quantum-field-theory, string-theory, mathematical-physics, research-level
For the relation between representations and quiver reps, the easiest thing to say is that a representation of the quiver is the same as giving a vev to all bifundamentals. | {
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"lm_q2_score": null,
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"tags": "quantum-field-theory, string-theory, mathematical-physics, research-level",
"url"... |
arduino, servomotor, design
Using a screw conveyer powered by a simple servo moter. I found this CAD model which i could replicate The Thingiverse link
Using plastic bottles filled with sugar or tea leaves. The opening of the bottle could be opened or closed with a servo moter, allowing the sugar or tea leaves to dro... | {
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"id": 2509,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "arduino, servomotor, design",
"url": null
} |
ros, kinect, openni, rosbag, openni.launch
Originally posted by Karan on ROS Answers with karma: 263 on 2012-08-11
Post score: 0
As the error message says, the driver can't publish both RGB and IR images at the same time. rosbag record -a tries to subscribe to ALL advertised topics, thus asking the kinect driver for ... | {
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"id": 10567,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, kinect, openni, rosbag, openni.launch",
"url": null
} |
c++, linked-list, stack
private:
struct node {
int value;
node* next;
};
node* head;
int num_elements;
}; | {
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"id": 18304,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, linked-list, stack",
"url": null
} |
electromagnetism, special-relativity
Title: Relative motion and magnetic field production We have Ampere's circuital law
$$\oint \vec B\cdot dl=\mu_0I+d\phi/dt \tag{1}$$
stating that every current-carrying wire produces a magnetic field. And so should a charge moving with constant velocity. But, for an observer moving... | {
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"id": 65703,
"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": "electromagnetism, special-relativity",
"url": null
} |
protein-structure, structural-biology, pymol
This will label residue 198 with a small A to fit the small sphere. However, this will also change the earlier label to size 8 as well, making it too small for the sphere.
Is there any way for me to prevent this, such that each residue keeps its own label size?
I know that... | {
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"id": 1121,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "protein-structure, structural-biology, pymol",
"url": null
} |
# How to combine ratios? If $a:b$ is $2:5$, and $c:d$ is $5:2$, and $d:b$ is $3:2$, what is the ratio $a:c$?
How would I go about solving this math problem?
if the ratio of $a:b$ is $2:5$ the ratio of $c:d$ is $5:2$ and the ratio of $d:b$ is $3:2$, what is the ratio of $a:c$?
I got $a/c = 2/5$ but that is not a corr... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9799765628041175,
"lm_q1q2_score": 0.8145007154364029,
"lm_q2_score": 0.8311430562234877,
"openwebmath_perplexity": 700.3094468341335,
"openwebmath_score": 0.8521254658699036,
"tag... |
quantum-mechanics, atomic-physics, molecules
You can indeed also include 2p, 3d, 4f whatever contributions, but for the same reasons as above, you will find that orbitals wildly away in energy from the others will have large $\alpha$ and small $\beta$, and consequently will not show up very much in molecular orbitals ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, atomic-physics, molecules",
"url": null
} |
java, sql, design-patterns, swing
queryFilters="";
}
ViewingQuery(List parameterList,String queryFilter,String baseQuery){
this.parameterList=parameterList;
this.baseQuery=baseQuery;
this.queryFilters=queryFilter;
}
public ViewingQuery withFilter(String queryFilter,String .... | {
"domain": "codereview.stackexchange",
"id": 32839,
"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": "java, sql, design-patterns, swing",
"url": null
} |
c#, unit-testing
Title: Unit test provider roles I am unit testing this role provider. I have a few asserts in the code for my test. I am sure there are more test I could preform. Does anyone have any suggestions for more test for this role of the membership provider?
[TestMethod]
public void TestDeleteUserAccess(... | {
"domain": "codereview.stackexchange",
"id": 3816,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, unit-testing",
"url": null
} |
below, but still lacks power set, is an abundance of natural models, such as the following:</p> <ul> <li><p>HC, the universe of hereditarily countable sets. This is the land of the countable, where everything is countable. The sets in HC are precisely those sets that are countable and have only countable members and me... | {
"domain": "mathoverflow.net",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9621075739136381,
"lm_q1q2_score": 0.8324386563542616,
"lm_q2_score": 0.8652240964782011,
"openwebmath_perplexity": 380.9785412055225,
"openwebmath_score": 0.8968687653541565,
"tags... |
organic-chemistry, conformers
Lysozyme binds to a series of carbohydrates in the peptidoglycan cell walls of some bacteria. Together with water, it hydrolyses the glycosidic bonds (a fancy name for an acetal) in these carbohydrates: | {
"domain": "chemistry.stackexchange",
"id": 5589,
"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": "organic-chemistry, conformers",
"url": null
} |
ideal-gas, virial-theorem
I am wondering about the situation of non-interacting particles that are moving around but do not interact with any container. In this case, there are no forces applied on the point particles so that the right hand side of the Virial Theorem expression is $0$. This seems to imply that $\langl... | {
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"tags": "ideal-gas, virial-theorem",
"url": null
} |
Since $$x_i\gt 0$$ and $$\sum_i x_i=1$$, we also have $$x_i\lt 1~\forall~i$$ and the map $$f\colon x\mapsto\dfrac x{2-x}$$ is convex on $$[0,1]$$
We have,
$$\sum_{\text{cyc}}\frac{x_i}{2-x_i}=\sum_{\text{cyc}}f(x_i)\geq nf\left(\frac{\sum_i x_i}n\right)=nf(1/n)=n\frac{1/n}{2-1/n}=\frac n{2n-1}$$
with equality iff al... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9728307716151472,
"lm_q1q2_score": 0.8288059017185183,
"lm_q2_score": 0.8519528019683106,
"openwebmath_perplexity": 830.9882843540391,
"openwebmath_score": 0.7383991479873657,
"tag... |
soft-question, resource-recommendations, education, big-list
Well, once you have a bit powerful knowledge on simplest maths, you can go straight to the funniest part:
W. Greiner, "Classical Mechanics: System of Particles and Hamiltonian Dynamics"
Quantum Mechanics, Demystified. For far, the best introductory book to ... | {
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"tags": "soft-question, resource-recommendations, education, big-list",
"url": null
} |
ros-kinetic
Originally posted by brunoribeiro on ROS Answers with karma: 1 on 2018-04-10
Post score: 0
Original comments
Comment by gvdhoorn on 2018-04-10:
This is not a solution, but: you don't need to import roslib any longer in a rospy script. Unless you're using some functionality from it of course.
You need to ... | {
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"tags": "ros-kinetic",
"url": null
} |
quantum-mechanics, thermodynamics, atomic-physics, photon-emission
The final process under consideration is the absorption which increases the $n_2$ population, with its associated probability $B'$ times $I(\omega)$.
With these processes, the rate of change of population $n_2$ in the ensemble will be given by the foll... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, thermodynamics, atomic-physics, photon-emission",
"url": null... |
linear-systems, impulse-response, step-response
Translation:
A causal LTI system responds to a rectangular pulse $s(t) = \operatorname{rect}(t)$ with $g(t) = \Lambda(2t)$
a) What is the response for $s_1(t) = \operatorname{rect}(\frac{t-1}{2})$?
b) What is the unit step response?
c) What is the impulse response?
And ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "linear-systems, impulse-response, step-response",
"url": null
} |
homework-and-exercises, electric-circuits, electric-current, charge, electrical-resistance
Title: Rate of flow of electrons in a simple circuit, given the current? I have this question: | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, electric-circuits, electric-current, charge, electrical-re... |
c++, linked-list, interview-questions, pointers
If the caller wants to print the value, that should be its business. It doesn't really belong here. Similarly, the additional arguments to traverseHeadToTail simply complicate and slow down the code because it checks both flags for every single node in the list.
Use a ... | {
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"id": 24666,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, linked-list, interview-questions, pointers",
"url": null
} |
algorithms, dynamic-programming, decision-problem
Title: DP - Removing contiguous subsequences from a sequence optimally I was asked this question a while ago and I'm very stuck: | {
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"tags": "algorithms, dynamic-programming, decision-problem",
"url": null
} |
ros, installation
Originally posted by MartinHummel with karma: 156 on 2014-02-26
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by ahendrix on 2014-02-26:
It sounds like your company proxy is rewriting URLS in a way that doesn't play well with the filenames on the ROS package s... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, installation",
"url": null
} |
java, swing, formatting, stackexchange
JButton performButton = new JButton("Create Question stub with code included");
performButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
result.setText("");
ReviewPreparer preparer =... | {
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"id": 6017,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, swing, formatting, stackexchange",
"url": null
} |
(see the introduction), this command displays nested fractions without changing the size of the font. Using fractions and binomial coefficients in an expression is straightforward. The binomial coefficient is the number of ways of picking unordered outcomes from possibilities, also known as a combination or combinatori... | {
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"lm_q2_score": 0.8519527982093666,
"openwebmath_perplexity": 1074.9410209736775,
"openwebmath_score": 0.9310876131057739,
"tags": null,
... |
homework-and-exercises, thermodynamics, material-science, phase-transition, ice
I used the lower boundary for density of steel (from source).
Ice cubes:
Heat capacity $C=\rho_i\cdot V \cdot C_i \approx 15.33\left[\mathrm{\frac{J}{^\circ C}}\right]$
Steel cubes:
Heat capacity $C=\rho_s\cdot V \cdot C_s \approx 28.89\l... | {
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... |
\implies g(x) \le g(1) =5/12 \space \forall x\in[1,3]$$thus$$0\le \int_1^2\frac{3^x+2}{3^{2x}+3^x}\le \frac{5}{12}(2-1)< \frac{1}{2}$$3$$f(x) = \frac {3^x + 2}{3^{2x} + 3^x} f'(x) = -\dfrac{\ln\left(3\right)\left(3^{2x}+4{\cdot}3^x+2\right)}{3^x\left(3^x+1\right)^2} < 0 ~\forall ~ x \in \mathbb{R}$$Thus, f(x) is a decr... | {
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"openwebmath_score": 0.9997441172599792,
"tag... |
and demand function. Our treatment is closer to that Wald (1984) and closer still to Misner, Thorne and Wheeler (1973). Animated slides that the diagram is control a constructive framework are a best possible. And sometimes the little things are easier to work with. The only remaining possibility is f 0(x 0) = 0. Conti... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9890130593124399,
"lm_q1q2_score": 0.8711198220083848,
"lm_q2_score": 0.8807970873650401,
"openwebmath_perplexity": 1150.4617944075264,
"openwebmath_score": 0.49587282538414,
"tags": ... |
### Show Tags
Updated on: 24 Oct 2019, 02:32
karishma,
Can you please help me understand the term 'Profit as a percent of sales' and the question on the whole?
Look forward!
Originally posted by swikrityC on 23 Oct 2019, 00:53.
Last edited by swikrityC on 24 Oct 2019, 02:32, edited 1 time in total.
Intern
Joined: 26 ... | {
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"lm_q2_score": 0.8479677583778258,
"openwebmath_perplexity": 10810.497781245313,
"openwebmath_score": 0.6408360004425049,
"tags": ... |
electromagnetism, newtonian-gravity, gauss-law
So to put it mathematically
$$\vec{E} \propto \sum Q_{en}$$
But charge can be negative, a negative sum of charge means the electric field is going inwards.
$$\vec{g} \propto \sum M_{en}$$
But mass can only be positive, but g is then propotional to the mass enclosed, whic... | {
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"tags": "electromagnetism, newtonian-gravity, gauss-law",
"url": null
} |
c#, unit-testing, asp.net, asp.net-mvc, controller
var userprojects = (from up in dbEntities.T_USER_PROJECT
where up.UPR_USER_ID.Equals(userId)
select up);
//NEU alle Benutzer können sich anmelden
var projectId = (... | {
"domain": "codereview.stackexchange",
"id": 37560,
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"tags": "c#, unit-testing, asp.net, asp.net-mvc, controller",
"url": null
} |
the SI base.... Units for these derived quantities are obtained from these equations and the seven quantities! Moving with a velocity of any object that possesses energy can do work Class 09 Science! State its SI unit. called its mass and velocity, Showbiz Gaming! Momentum define the term Linear momentum is known as mo... | {
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"lm_q1q2_score": 0.8223807143961331,
"lm_q2_score": 0.8774767890838836,
"openwebmath_perplexity": 1568.941211268454,
"openwebmath_score": 0.7047728300094604,
"tags": null,... |
python, python-3.x, time-limit-exceeded, bioinformatics
LISTOFBASES = ["A", "C", "G", "T"]
RESULT_FILE = "resultsdinuc.csv"
def chunks(l, n):
for i in range(0, len(l)-1):
yield l[i:i+n]
def parse_file(infile):
for fasta in SeqIO.parse(open(infile), "fasta"):
freq = Counter(fasta.seq)
... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, time-limit-exceeded, bioinformatics",
"url": null
} |
black-holes, causality, event-horizon
Of course, we can't say for sure that the the radius of the mass object is smaller than the event horizon, since we can't see what happens within.
So in other words a black hole is by definition much bigger that I thought since I make it coincide with the surface of the mass objec... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "black-holes, causality, event-horizon",
"url": null
} |
zoology, food, nutrition, feline
Title: Special food for big cat cubs? For house cat kittens there is special 'kitten food', containing more nutrients than normal cat food in order to compensate for the fact that at pretty much any time of the day kittens spend a gazilion times as much energy as an adult cat would.
I ... | {
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"id": 12124,
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"openwebmath_score": null,
"tags": "zoology, food, nutrition, feline",
"url": null
} |
ros, rosdoc, msg
Originally posted by Lorenz with karma: 22731 on 2011-08-16
This answer was ACCEPTED on the original site
Post score: 4
Original comments
Comment by gong on 2011-08-17:
you provide a very important document. That have been solved my question. Thanks. | {
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quantum-mechanics, wave-particle-duality
Question :
Consider a DeBroglie matter wave (I couldn't get any formula or equation of it from googling), what I am interested in is the equation of the Debroglie wave and explanation of all the physical parameters in it and reasons why it was formulated.
Then of course how it ... | {
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"tags": "quantum-mechanics, wave-particle-duality",
"url": null
} |
c++, regex, c++17
static constexpr char backslash = '\\';
static constexpr char forwardslash = '/';
static constexpr char question_mark = '?';
static constexpr char colon = ':';
static constexpr char s = 's';
static constexpr char w = 'w';
static constexpr char d = 'd';
static constexpr ... | {
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ros, 3rd-party-package, catkin, velodyne
[ 0%] Built target rosgraph_msgs_generate_messages_cpp
[ 0%] Built target diagnostic_msgs_generate_messages_cpp
[ 0%] Built target bond_generate_messages_lisp
[ 0%] [ 0%] Built target sensor_msgs_generate_messages_lisp
Built target diagnostic_msgs_generate_messages_py
[ 0... | {
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cc.complexity-theory, pcp
The point is that there is some variable block such that the optimal assignment (restricted to that block) already satisfies a $\varepsilon$-fraction of the maximum number of satisfied clauses. You'll get those extra clauses exactly correct, and you'll get $7/8$ of the the remaining fraction ... | {
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• @liambro, Thank you for your response! I got that $\angle MNP = 90^\circ$, and DPBM is a parallelogram, but I don't understand why we can state what the problem wants from here. – Nikol Dimitrova Apr 16 at 17:55
• We have that $O \in MP$, OP = OM but I don't understand the part of your solution with DPBM. What's the ... | {
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"tag... |
Let's recast the first example from the previous section. Suppose that the speed of the object is $3t$ at time $t$. How far does the object travel between time $t=a$ and time $t=b$? We are no longer assuming that we know where the object is at time $t=0$ or at any other time. It is certainly true that it is somewhere, ... | {
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"lm_q1_score": 0.9938070094752999,
"lm_q1q2_score": 0.8054596227431438,
"lm_q2_score": 0.8104789109591832,
"openwebmath_perplexity": 114.96026588112824,
"openwebmath_score": 0.9464420080184937,
"tags": n... |
javascript, jquery, performance
Reseting an object to a clean state is always a suspicious operation. For example, you have to make sure that:
all fields are correctly reset: often duplicating the same logic that must exist (explicitly or implicitly) in the initializer / constructor
The new approach doesn't have any... | {
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"tags": "javascript, jquery, performance",
"url": null
} |
electromagnetism, thermal-radiation
Title: How can a cavity with perfectly reflecting walls approximate a perfectly absorbing black body? I don't see why you can derive the black body spectrum from the mode density of the radiation inside a reflecting cavity. I do understand the mathematical side of the derivation and... | {
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"tags": "electromagnetism, thermal-radiation",
"url": null
} |
Let $\prod U_\alpha$ be a subset of $\prod X_\alpha$, where $U_\alpha = X_\alpha$, except for a finite number of indices for which $U_\alpha = U_{\beta_i} \; (i = 1, \ldots, k)$. Then, by definition, $\prod U_\alpha$ is a basis element for the product topology on $\prod X_\alpha$.
• Step 2. Let $Z$ be the subespace $f... | {
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"lm_q1q2_score": 0.806975901154885,
"lm_q2_score": 0.8333245953120233,
"openwebmath_perplexity": 89.85984622503736,
"openwebmath_score": 0.9584797620773315,
"tags... |
thermodynamics, electrons, elementary-particles, elements
Title: Would both life as well as elementary particles no longer exist upon “heat death? Would the elementary particles in the standard model still exist upon “heat death”?
Would electrons stop orbiting around the nucleus? Would the periodic table of elements s... | {
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"openwebmath_score": null,
"tags": "thermodynamics, electrons, elementary-particles, elements",
"url": null
} |
blast, metagenome, taxonomy
Title: Software for taxonomic assignment? I have a couple of hundred bacterial sequences of 2-30 genes of interest each, recovered from metagenomics. None of them encode rRNA. Normally I'd just BLAST the one gene I already know to be reliable phylogenetic marker, where present, but the scal... | {
"domain": "bioinformatics.stackexchange",
"id": 1526,
"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": "blast, metagenome, taxonomy",
"url": null
} |
filter-design, equalization
Yep, that's how you do it.
2) Given that filters are not perfect, does the order matters ?
Probably not. You're probably working with ≥32-bit floats on a computer processor? So you don't really need to worry about clipping or noise floor issues.
Hardware DSPs are often in fixed-point fo... | {
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"openwebmath_score": null,
"tags": "filter-design, equalization",
"url": null
} |
thermodynamics, pressure, diffusion
Thermodynamics gives us information about what is possible and what is not possible. For example, it tells us that a stone will not fall upwards and rush to the top of a mountain, but if a stone is pushed from the top of a mountain it could roll down all the way to the bottom. Therm... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, pressure, diffusion",
"url": null
} |
complexity-theory
Title: Class P is closed under rotation? Is the complexity class $P$ closed under rotation, where rotation is defined as $\text{rot}(L) = \{ wv \mid vw \in L \}$? How would we prove it? Yes. Suppose that $L \in P$, then $x \in rot(L)$ if and only if there exist $u,v$ such that $x = uv$ and $vu \in L... | {
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"tags": "complexity-theory",
"url": null
} |
python, python-3.x, comparative-review, random
ex_8 = "8. Sampling without replacement by a recursive method. \
The function take_new works as a \"cyclic\" function until we get a new sample from data."
def sampling_8(data, n=10):
data=copy.deepcopy(data);
N=len(data);
sample=[];
def take_new():
... | {
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"tags": "python, python-3.x, comparative-review, random",
"url": null
} |
java, spring, hibernate, crud
You are often injecting HttpServletRequest and HttpServletResponse as method arguments. This is not necessary and bloats the method signatures. You can just define two instance fields of those two classes and annotate them with @Autowired. Spring creates proxies for those classes and offe... | {
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"tags": "java, spring, hibernate, crud",
"url": null
} |
quantum-mechanics, adiabatic, quantum-hall-effect
If we start the evolution with a eigenstate ${\psi (t = 0)}$ of the conserved operator:
$$p_{\phi} {\psi(t = 0)} = m {\psi(t = 0)}$$ the adiabatic evolution $U(t)$ conserves this status:
$$
U(t) p_{\phi} U^{-1}(t) U(t) {\psi(t = 0)} = m U(t) {\psi(t = 0)}
$$
$$
p_{\phi... | {
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"tags": "quantum-mechanics, adiabatic, quantum-hall-effect",
"url": null
} |
imu, navigation, odometry, ros-kinetic, robot-localization
process_noise_covariance: [1.0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1.0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
... | {
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"tags": "imu, navigation, odometry, ros-kinetic, robot-localization",
"url": null
} |
performance, c, strings, search, rags-to-riches
A subsequent run gives:
totaltime syb0rg = 1750000
totaltime 200_success = 1610000
totaltime rolfl = 1050000
totaltime janos = 1840000
totaltime Edward = 1080000
Winner is rolfl
Now, that difference is small, I realize, but it is real ;-)
Also, admittedly, occasionally ... | {
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"tags": "performance, c, strings, search, rags-to-riches",
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python, performance, beginner, python-3.x, programming-challenge
This looks like a wall of text. My aging eyes can't see where the doc-string ends and the code begins. Putting the """ delimiters on their own line, and add a blank line after the doc-string goes a long way towards improving readability.
def check_part... | {
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1v7l3vc886zlg2, m83gip4j73vjfp, o5m33ui5xk4r4g, d76u869uc05fv, gbo71a9euqdvt, du2sldoup68h, 8wu1rxtgoc7tng0, o7uvrhbdlti2, ay9wjkki4za5y, olesufgei95yk, bs98c7ai3z00, 8tzdyariin4c7h, t1kt2p3udiq, s9o8ylnuu7ft83, ks0tprhj6stqjd, q1dh0lb81aofsm, ukci9e944q, ajxzbl7lregmo1, n5h8l6ozp41yg, 7pb60d55luftbpv, i10r3fzynjgw, l0... | {
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"lm_q2_score": 0.8670357598021707,
"openwebmath_perplexity": 349.6453176432852,
"openwebmath_score": 0.8708940148353577,
"tags":... |
html, css
Title: HTML/CSS MS Word style navigation ribbon I made a MS Word style ribbon header, but it all seems very hacky, and I'm not really sure how to simplify it to something more reasonable. Rolling over one of the navigation icons changes the related z-index to positive revealing it. Then, on hover it changes ... | {
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"url": null
} |
ruby, html, ruby-on-rails
I don't understand: m.format, where is m? is it mny?
ebeach?. What is ebeach??
m.format[-3, 3]. Do you want the last 3 chars of a string? In Rails: m.last(3).
@visitor: Using an instance variable in a helper is a no-no. Pass it as an argument. | {
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java, stream, rags-to-riches
By streaming the indices you can process the data in a natural stream way and pull the data by index from the corresponding positions in the sources.
Finally, the product operator should be supplied as an input lambda, and not built in to the stream-iterator-stream translation.
The solutio... | {
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"url": null
} |
electromagnetism, quantum-field-theory, standard-model, magnetic-monopoles
$$A_\nu(x)\rightarrow A_\nu(x)+L(x)$$
do not change the physics. The above are known as local/gauge transformations and they are distinctly different from global transformations in which the function does not depend on the position, ie:
$$A_\nu... | {
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"ur... |
$3=2 \pi r$
$\frac{3}{2 \pi}=r$
$A=\pi(\frac{3}{2 \pi})^2$
$A=\frac{9}{4 \pi}$
While we’re used to a base 10 system ($d_1 + \frac{d_2}{10} + \frac{d_3}{100} + \frac{d_4}{1000} + ...$) the Babylonians used a base 60 system ($d_1 + \frac{d_2}{60} + \frac{d_3}{60^2} + \frac{d_4}{60^3} + ...$). Also at the time the Babylo... | {
"domain": "wordpress.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9883127426927789,
"lm_q1q2_score": 0.8458485889453616,
"lm_q2_score": 0.8558511414521923,
"openwebmath_perplexity": 756.5379572824651,
"openwebmath_score": 0.7031155228614807,
"tags": ... |
terminology, units, si-units, metrology
Thus, the strict SI realization of the ohm, as standard of resistance, is roughly the following: | {
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"tags": "terminology, units, si-units, metrology",
"url": null
} |
newtonian-mechanics, newtonian-gravity, orbital-motion, celestial-mechanics
Title: What are Lagrange points in gravitation fields?
What are Lagrange points in gravitation fields?
Additionally, what are their properties? For example, if a satellite or asteroid rested at a Lagrange-point. A Lagrange point is a positio... | {
"domain": "physics.stackexchange",
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"tags": "newtonian-mechanics, newtonian-gravity, orbital-motion, celestial-mechanics",
"u... |
data-structures, terminology, distributed-systems, hash-tables, history
Does anybody of you know of earlier research (maybe pre-90s?) in the topics of distributed hash tables and/or structured overlay networks? I'd be glad to hear some keywords which could lead me to more historic papers. The term can at least be trac... | {
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"openwebmath_score": null,
"tags": "data-structures, terminology, distributed-systems, hash-tables, history",
"url": null
} |
beginner, c, game-of-life, sdl2
if(PrevGameGrid[i-1][j-1].isAlive == true)
aliveNeighbors++;
if(PrevGameGrid[i-1][j].isAlive == true)
aliveNeighbors++;
if(PrevGameGrid[i-1][j+1].isAlive == true)
aliveNeighbors++;
... | {
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"tags": "beginner, c, game-of-life, sdl2",
"url": null
} |
# Does the Symmetric difference operator define a group on the powerset of a set?
$G$ is the set of all subsets of a set $A$, under the operation of $\triangle\;$: Symmetric Difference of sets.
$A$ has at least two different elements.
I need to check if this is a group, and if it does to show if the group is abelian... | {
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"openwebmath_score": 0.9012470245361328,
"ta... |
of all this in terms of sets now. Which set contains the other, the set of doubly-even numbers or the set of even numbers? Clearly, the set that corresponds to more stringent membership criteria is smaller than the set that corresponds to less restrictive criteria, thus the set defined by a weak membership criterion co... | {
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"lm_q1_score": 0.9930961627460978,
"lm_q1q2_score": 0.8000702331447754,
"lm_q2_score": 0.8056321866478979,
"openwebmath_perplexity": 150.31495195193907,
"openwebmath_score": 0.9204863905906677,
"tags"... |
algorithm, c, sorting, mergesort
offset = 0;
runs_remaining = run_length_queue_size(queue);
while (run_length_queue_size(queue) > 1)
{
left_run_length = run_length_queue_dequeue(queue);
right_run_length = run_length_queue_dequeue(queue);
merge(source,
target,
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithm, c, sorting, mergesort",
"url": null
} |
gravity, energy-conservation
Title: Do particles lose energy when they emit gravitons? Is everything in the universe very slowly decaying due to gravity, do particles lose energy when they emit a graviton and gain energy if they happen to absorb a graviton? You need to distinguish between real and virtual gravitons.
A... | {
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"tags": "gravity, energy-conservation",
"url": null
} |
The line integral itself isn't the problem, the problem tis how to define the limits of integration.
I have the same problem with this example
$\int_c(2a-y)dx+xdy$
where c is an arc of the first bow of a trochoid
$x=a(t-\sin(t))$
$y=a(1-\cos(t))$
In the first, I'd switch to a parametric form: x = a cos(t), y = b sin... | {
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"openwebmath_score": 0.8866435885429382,
... |
that you want to calculate the sine of. The sine and cosine functions are also commonly used to model periodic function phenomena such as sound and light waves, the position and velocity of harmonic oscillators, sunlight intensity and day length, and average temperature variations through the year. Solution : Since 75º... | {
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"lm_q1_score": 0.9877587247081928,
"lm_q1q2_score": 0.8335647464087809,
"lm_q2_score": 0.8438950986284991,
"openwebmath_perplexity": 765.0087309333758,
"openwebmath_score": 0.8701221346855164,
... |
differential-geometry, vector-fields, variational-calculus
Title: Lie derivative and variation I have a couple of questions regarding the variation in Noether's theorem
Given an arbitrary tensor field $\phi$ can we generally identify an infinitesimal variation with the Lie derivative of that field along some vector f... | {
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} |
c#, linq
return parts.ToList();
}
} It's definitely excessive. :)
I'd start by looking into whether there should be one method for getting the data without a commodity filter, and one method for the ones with commodity.
I'd also put each query into its own method anyway. That will give you quite a bit more readabl... | {
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"url": null
} |
the contradiction proves the temporary assumption false. Proof: (direct proof) Assume that n is an even integer. Squaring both sides of the equation, we get: 2n= (2k+ 1)2 = 4k2 + 4k +1 = 2(2k2 + 2k) + 1= 2r + 1, 2 where r = 2k+ 2k , an integer. If a direct proof is straightforward then this is to be preferred – a direc... | {
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"lm_q2_score": 0.8267117855317474,
"openwebmath_perplexity": 400.88229711665093,
"openwebmath_score": 0.7787... |
c#, unit-testing, reflection, mvvm
}
item.PropertyChanged += (sender, args) =>
{
if (propsChanged.ContainsKey(args.PropertyName))
{
propsChanged[args.PropertyName] = true;
}
};
typeof(ConfigItem).GetProperty(propName).SetValue(item, set);
object actual = typeof(C... | {
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"openwebmath_score": null,
"tags": "c#, unit-testing, reflection, mvvm",
"url": null
} |
everyday-life, coriolis-effect
Estimate the magnitude of the Coriolis force on the toilet water. Use this to estimate the magnitude of effect of the Coriolis force on the toilet water spin.
Enumerate the possible other sources of spin for the toilet water. The two major ones off the top of my head would be any angl... | {
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"openwebmath_score": null,
"tags": "everyday-life, coriolis-effect",
"url": null
} |
geometric-optics
My question is: what's the point of spelling out a phase factor in that way, if we then still allow that $\mathbf{E}_0(x,y,z)$ and $\mathbf{H}_0(x,y,z)$ can be complex functions?
In doing so, it seems to me, we do not get any particular case (compared to not doing it and leaving the generic functions ... | {
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"tags": "geometric-optics",
"url": null
} |
java, io
FileReader r = new FileReader(f);
BufferedReader br = null;
try {
br = new BufferedReader(r);
StringBuilder buff = new StringBuilder();
String line;
while (null != (line = br.readLine())) {
if (line.length() > 0) {
line = line.replaceAll("<b... | {
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"id": 4756,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, io",
"url": null
} |
reinforcement-learning, reference-request, definitions, markov-decision-process
So, these are operators (like the gradient operator or the Bellman operator) because they take as input a function and produce another function.
Now, if we set
$(\color{blue}{\oplus} U)(s, a)=\sum_{s'} \color{blue}{P}(s, a, s') U(s, a, s'... | {
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"tags": "reinforcement-learning, reference-request, definitions, markov-decision-process",
"url... |
php, sorting
default:
# do nothing...
} First, it may make sense to make sure that the field you're checking in $sort, is the same as the propertyname of the object in $jobs_list.
Also, it looks like there's a lot of identical sort functions; the only difference being that the property you're checking is diffe... | {
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"openwebmath_score": null,
"tags": "php, sorting",
"url": null
} |
matlab, ofdm
(With as little as 2 samples per symbol you can completely replicate the eye diagram as in the plots below using the MATLAB "resample" command).
Consider the eye diagram on the right showing the real and imaginary components on the upper and lower graph, and if we sample at time T=0, we should see tiny do... | {
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"openwebmath_score": null,
"tags": "matlab, ofdm",
"url": null
} |
organic-chemistry, molecular-orbital-theory, hybridization
(Laplacian distribution, solid blue lines indicate charge depletion $\nabla^2\rho<0$, dashed blue lines indicate charge accumulation $\nabla^2\rho>0$, red spheres are bond critical points, black lines are bond paths, dark red lines are zero flux surfaces. Hydr... | {
"domain": "chemistry.stackexchange",
"id": 3760,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, molecular-orbital-theory, hybridization",
"url": null
} |
javascript, php, jquery, ecmascript-6
i += s.len;
doodle_add_element( { type: 'R', R: s.num } );
break;
case 'T':
showTurtle();
break;
case 'N':
hideTurtle();
break;
case 'A':
var s = read_number( List[idx].dra... | {
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"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, php, jquery, ecmascript-6",
"url": null
} |
quantum-field-theory
1. Eqn (2.5.12) defines a choice of basis, where $k$ is the standard standard momentum and $k'$ is an arbitrary momentum state. It's possible to choose such a basis but it's not automatic.
2. Again, the operator $U$ being unitary (length-preserving) does not guarantee that its rep's matrices will... | {
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"id": 7344,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory",
"url": null
} |
laser, ros-hydro, turtlebot
scan height should be independant of the base used - it's the number of scan lines used in the image.
We did notice an interesting behaviour once with it at 10. Setting it >1 causes it to scan within an arc out the front of the robot. This can actually create surprising obstacle detection ... | {
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"id": 16489,
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"openwebmath_score": null,
"tags": "laser, ros-hydro, turtlebot",
"url": null
} |
electrostatics, electric-fields, polarization, dielectric, dipole-moment
Another explanation I gave myself is that this is a purely theoretical result, I should not see it in terms of polarization. Indeed, these formulas are used afterwards in the book to investigate polarization more deeply, so I really shouldn't exp... | {
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"tags": "electrostatics, electric-fields, polarization, dielectric, dipole-moment",
"url"... |
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