# All Questions

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### Manipulate Problem in a Queueing Network Process

I have a two stage queueing network and want to vary the number of servers at the second node. The input data and the Manipulate command is below: ...
42 views

### Possible memory leak in FindMinimum? (MMA v10.0)

So I was running some code when I noticed Mathematica was gulping memory, and after some debugging I think the culprit is found. It turned out the function ...
91 views

### Symbolic vs numerical integration

This is related to a question that I asked before but didn't resolve quite well. I want to obtain the solution of the following expression analytically: ...
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I want to write a SystemDialogInput function that allows user to choose a file from a directory. In the directory, there are two kinds of image files: Atom images: The name of the file is in the ...
32 views

### MeshRefinementFunction missing points

I'm doing some FEM on a rectangular region with a spherical cavity: ...
35 views

### How to refer a number in a list with two columns, first one is a number and the second one is empty?

Let's say, I have defined a list as list = {{-31, -31}, {52, }, {34, -11}, {-38, }, {78, -44}, {-36,14}, {-9, 98}, {33, 6}, {82, 99}, {-85, -10}} As you can see, ...
112 views

### How to extract a contour line (or a region) from a ContourPlot?

Given a ContourPlot with a set of contours, say, this: is it possible to get the contours separating domains with the different colors in the form of lists? ...
31 views

### Changing from Cartesian to polar coordinates in partial differential equation [duplicate]

I have a partial differential equation: $$\left(x^2+y^2\right)\frac{{{\partial ^2}u(x,y)}}{{\partial {x^2}}} + x^2\frac{{{\partial ^2}u(x,y)}}{{\partial {y^2}}}=0$$ How to change from Cartesian to ...
80 views

### Add terms to nested list

Suppose I have a nested list of the following: list={{1,2},{5,8},{4,1}...} I would like to add a number to each first term of the list. The output would be ...
29 views

### Automatic text-wrapping in labels in TimelinePlot

Part-related to this question and part-related to this one, I would like to make use of the new features of TimelinePlot in 10.3, but would like to incorporate some ...
17 views

### Length in Compile encounter “type Integer encountered in assignment of Type Real ”

Compile[{}, Module[{n}, n = Length[{1, 2, 3, 4}]; n = n/2]] The above code will emit errors Compile::cset: Variable n of type _Integer encountered in ...
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### ParrallelTable should distribute dedicated evaluation range to different kernels

I have 4 kernels and would like that in ParallelTable: ...
31 views

### Optimization (minimization) of equations with conditions [on hold]

I need to minimize the expression a+(b/3) + c under the conditions: ...
53 views

### How to solve for the eigenvalue in matrix?

For which value of $a$ in the matrix {{a,2}, {3,4}} has the matrix eigenvalue of $0$? How to solve it in Mathematica?
69 views

### How to generate two group of $n$ random numbers in $U(0,1)$ such that sum of these two groups equal?

I want to have two groups of $n$ random numbers $u_i$ and $v_i$ in $U(0,1)$, such that $\sum u_i = \sum v_i$ What I tried is: I can firstly get $u_i$ by ...
10 views

### Why can't I change the Magnification in Printout Style in Default.nb

This happens with Mathermatica 10.3.1.0: When working with a notebook, I can choose between different working environments. However, they inherit their settings from Default.nb situated at ...
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### I want to plot a list of points with specified t and x[t] coordinates [on hold]

I have this code: ...
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62 views

### How to solve this recursive system?

I try to solve the equation system as ...
55 views

### Notebook Magnification changes - Why?

I have written a notebook but in order to edit it, I prefer 125% magification or even 150%. I know Window>Magnification. Also there is a small symbol on the right bottom of the notebook, where I can ...
37 views

### Need Help with solve function [on hold]

I'm trying to re-write this function x = e^(-(r+(1/2)*sigma^2)*t-(g)(sigma)*sqrt(t)), as an expression of "g" instead of "x" ...
214 views

### Follow each pixel brightness in set of images (Memory constrained)

I have a set of 2700 consecutive png images (8bit, 2048*2048 pixels). I would like to visualize the intensity variation of each pixel vs. image number. Here is an example of 10 images: ...
35 views

### Possible Bug with DateObject

So my questions is going to be hard to duplicate because I am not sure when or why it happens. I've read here several bugs with DateObject, but none of them ...
42 views

### 3D orbits of moons around their respective planets

I have seen a lot of solar system models (both animated and not), but I am trying to replicate the same thing with moons. Either just one planet and its lunar system or the our whole solar system with ...
33 views

### How to run code in two notebooks simultaneously [duplicate]

I have the problem that I cannot run code in a second notebook when another notebook is being executed (here only a single core is used). The CPU of my computer has 4 cores (Win 10, Mathematica ...
65 views

### I need to write an animation of something l [on hold]

I need to write an animation of something like this: [![enter image description here][1]][1]
35 views

### FindInstance—why doesn't it work with my expression? [on hold]

I want to find arbitrary solution of a system of equations: ...

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