# All Questions

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### Equation simplification

Given that: ...
85 views

I do not know much about computer architecture, but some Intel processors have hyper-threading technology, which can apparently improve parallelization for applications that take advantage of it. In ...
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### Solve: Merging two branches of the solution

I have the following code: ...
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### Using an arbitrary area bounded by lines for PDEs?

I have a set of lines I pulled from an image that make a closed loop, pretend it's a unit square for reference. Is there a way to use such an arbitrary region for solving PDEs, and is there a way to ...
77 views

### NIntegrate and Sum give different results in summing functions

I am using these two functions: ...
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### Speed up derivative evaluation

I'm trying to calculate the normal vectors and the tangent vectors at the discrete points of a suface. For example: ...
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### differntial geometry [migrated]

i m facing much difficulty in understanding behaviour of acceleration vector relating to unit normal vector &unit tangent vector . However,study reveals that tangent vector is perpendiular to ...
113 views

### Recursive Euclidean algorithm in Mathematica

Can anyone explain to me how do I use a recursion, if I don't know the limit? For example, I need the remainder $r$ of the Euclidean algorithm for $\gcd(a,b)$ which equals $0$. I figured out that the ...
269 views

### SaveDefinitions->True changes the displayed image

Bug introduced in 9.0.1 or earlier and persisting through 10.1.0 or later I have a Manipulate[ ] that displays an image with a superimposed ...
50 views

### Plotting ListLinePlots together creating a 3D view

I have a *.xlsx file containing four columns, each pair representing an x and y value, so ...
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### Position vs Part

What's the difference between Part and Position? How can I "move" from the form used by Part to that of Position (and vicerversa?) Thanks!
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### How to call rsync from Mathematica?

I've tried following a few answers on how to control processes from Mathematica, but none of them are working for me. I am using rsync to download some files with flags for resumeability and ...
28 views

### Plotting a Forced Vibration Differential Equation

I'm attempting to plot a differential equation solution but mathematica is giving me trouble. The plot is showing up blank. Here is what I have. ...
19 views

### Import nested JSON file [duplicate]

For a project where I receive JSON messages from a web server I was trying to convert these messages into a format that can be used easily within Mathematica. Because JSON also consists of key-value ...
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I am using ...
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### Sow only if different from zero

I am trying to collect elements with Reap and Sow, where I am interested only in non-zero elements, that is I am trying something like that ...
219 views

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### Young Tableaux Miscellanea

I have a problem which is mostly neatly described by using Young Tableaux. Mathematica seems to have these Tableaux built in, except that the Tableaux function is ...
32 views

### How can I monitor the progress of a Plot?

This answer is not useful in my case: How to monitor the progress of a plot I am using ...
3k views

### Plotting several functions

I'd like to plot a function of one real and one integer variable, but I don't want them all shown in the same 2-D plot - I'd like to see them as separate curves so I can see both "axes", more like how ...
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### Generating multiple tables dependent on random variable in loop

I have the following code: ...
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### Axis alignment identical to matlab plots

Mathematica uses in my opinion a weird concept of camera alignment. I would like to align the axes in Mathematica in the same way how Matlab does. For example, in the following picture you see a ...
186 views

When I enter ...
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### Asynchronous evaluation on EventHandler

How can I make this progress bar appears when I press Enter? The Button Evaluate works just fine, but when Enter is pressed it jumps the progress bar. It would be ...
45 views

### Saving an XMLObject imported inside a notebook

In a notebook, I import an XMLObject from a html file with this code line : XMLData = Import["Z:/XXX/XXX/XXX.mw", "XML"]; In order to have all the data in the ...
85 views

### NDSolve and assuming

I am trying to solve the system of PDE with NDSolve and I got an error message like this NDSolve::deqn: "Equation or list of equations expected instead of ...
314 views

### Speeding up the non-negativity algorithm for multilinear function with interval probabilities?

The algorithm is a branch-and-bound algorithm that calculates the non-negativity of a multilinear function with interval probabilities. The lines 9-11 has an optimization that is explained on the ...
498 views
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### Import an SPSS, SAS, or STATA file into Mathematica

I would like to import the World Value Survey data file into Mathematica, but it's only given in spss, sas or stata formats, which are statistical analysis softwares format I think. I can't get to ...
50 views

### Solving a system of equations using NSolve

I am trying to solve the following system of equations using NSolve, but am running into some problems. Any suggestions ? CASE1 - Facing Problem in Solving the ...
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### using FindRoot to solve 3 simultaneous equations [on hold]

I'm trying to solve 3 simultaneous equations derived from an electrical circuit of a common source amplifier. ...
706 views

### Proving the hairy ball theorem using xAct

I would like to formally prove the hairy ball theorem in Mathematica, initially just for $S^2$, and then see about generalizing. An approach I thought about to use the xAct package to define $S^2$ ...
41 views

### Solve PDE with DiracDelta function

This question is related to Solve wave equation using DSolve?. I think it is more appropriate to open another question on this topic. In the question, the compatibility conditions can be introduce ...
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### How to change the atom size of LatticeData

Using the "Image" property of LatticeData, I can generate representation of lattice structures (like the first basic example did). But it seems that the atom size is a constant, can I enlarge it? ...
37 views

### ImageAssemble and Export gif takes too much memory

Errr.... First Let's create some gifs: ...
133 views

### How to further accelerate arithmetic with Fermat Pseudoprime and Fibonacci number

I've been working on this all night, and I have made this go pretty fast, compared to my first iteration of the program, but now I'm out of ideas. I'm trying to write a program to test (by good ...
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### Problem with the output of a function I program

(This is the function that I programmed) Zm2[Z_, nk_] := (zm2 = 0; For[i = 0, i < Length[Z], i++, zm2 += nk[[i]] *Z[[i]]* Z[[i]];]; Return[zm2];); ...