# All Questions

2answers
157 views

### Comparing elements of the $n^{\text{th}}$ sublist in a ragged list with the $n^{\text{th}}$ member of a sequence

I have a list of lists that are not of the same length (for example, {{6}, {14}, {6, 26, 30}}), but I have to compare every element in the $n^{\text{th}}$ sublist ...
1answer
150 views

### MapThread with several cells as output

Assume I have defined the following function: FF[{x_, y_}] := {x^2 + y^3, 3.5*x*y} I would like to apply FF on a list of ...
1answer
2k views

### How to demodulate an FM signal in continuous-time?

I'm not sure if this is a math or Mathematica question, but I'm posting it here because I'm interested in possible Mathematica tools/functions to solve the problem. I'm stuck. I want to simulate ...
3answers
3k views

### Calling MATLAB from Mathematica

How can I call MATLAB functions directly from Mathematica and transfer data/variables between the two systems?
1answer
377 views

### CountryData and the areas of the world

If I add the WaterArea and the LandArea of the world, I get the same number as if I asked for the total area of the world in the first place: ...
1answer
137 views

### Slow Dynamic Button Does Not Print [duplicate]

Possible Duplicate: Why do buttons with ChoiceDialog freeze the front end? Why is SystemDialogInput failing to return a save file path? Evaluation inside Button stops after some seconds I ...
1answer
758 views

### Improving the source-code indentation in Wolfram Workbench

One thing that I like about the more recent versions of the Mathematica front-end is that I think it does a good job indenting code. The language's functional nature, in my experience, leads to a lot ...
2answers
1k views

### Obtaining joint distributions and conditional distributions using Mathematica

I have two multivariate Gaussian distributions $p(x)$ and $p(z)$ with mean vectors $m_x$ and $m_z$, and covariance matrices $\Sigma_x$ and $\Sigma_z$. my model is a simple linear model $x = W z+n$ ...
8answers
623 views

### Applying And to lists of Booleans

I'd like to take {True,True,False} and {True,False,False} and apply And to get ...
4answers
168 views

### Pack Solve results into a vector

I am currently using a really easy function to get the eigenvectors of a corresponding eigenspace: ...
1answer
106 views

### How can I manipulate with elements inside sublists if sublists of different lenght?

I have some kind of output like this: {{1, 5}, {1, 13}, {1, 5, 25}}. I would like to be able to enter in each sublist and make sums of every two elements in sublists, for example my desired output ...
2answers
97 views

### How to uncompress only the compressed elements in a matrix

I have data in a rectangular structure – something like matrix={{a,b,c},{d,e,f},{g,h,i}}. The problem is that some of the columns consist of uncompressed data and ...
6answers
324 views

### Creating sums of elements from a list

I have a list $(d_1, d_2, .. d_k)$ and I want to create all sums that I get for adding only two elements for my list $(d_1+d_2, d_1+d_3,...d_{k-1}+d_k)$. The ...
4answers
2k views

### How to export data from For loop in text file?

I'm new in Mathematica and I am trying to write numbers from 1 to 10 in txt file. But "Null" is everything that is written in my file. The code is: ...
2answers
121 views

### How to force native styling of controls?

While preparing a dynamic module, I discovered a weird behaviour of Mathematica's controls when you rotate them: ...
1answer
193 views

### How do you define an affine transformation that is translated by itself?

This one should be simple, but I can't figure it out. I would like to define a transformation (function) such that $r$ maps to $m.r + r$ The help file on AffineTransformation says that ...
4answers
802 views

### Plotting a complex valued function over a circular region

I would like to apply some complex valued function to some region in the plane, say, a circle of radius $R$ centred at $k$. How can I do this?
3answers
376 views

### Where in the documentation can I find a list of function argument types?

Recently, I learned that it is possible to assign "types" to function arguments in the definition of a function. Suppose I have a function stringFun that does some ...
7answers
375 views

### Get the first element after the first sequence of length N of consecutively increasing values

I'm looking for an efficient way of extracting the first element after the first sequence of N consecutive elements in which the values are increasing. If these are the data of a toy example: ...
2answers
361 views

### How To Span Table Headings?

What I am doing wrong? I would like to get a header to the table and based on your code I tried this: ...
1answer
616 views

### How to map rotate, pan, zoom to manipulate controls

I am wondering if there is a way to restrict the motion of the rotate mouse cursor in when moving around a 3d plot. For example, I want the y direction of the cursor to correspond to pulling the z ...
1answer
255 views

### Problems with images caused by which stylesheet is used

Update This looks now like it was a bug in Mathematica version 8, because everything works as expected - at least for this minimal example - in version 9. (As an aside, I couldn't seem to find ...
1answer
346 views

### How do you insert more columns into Table cells?

How do you insert more columns into Table cells as shown below? To get to this table, go to File -> New -> Styled Notebook -> Textbook -> New -> Scroll down to the Table Cells.
1answer
129 views

### Tweaking Prime[n] to return 1 when n==0

I manually evaluate this cell to set Prime[0] Unprotect[Prime] Prime[0] = 1 Protect[Prime] I manually evaluate this cell to reset Prime[0] ...
7answers
451 views

### How to pick an element of a row corresponding to the minimum in a particular column?

How can I find what value in column 1 of my list corresponds to the minimum value in column 2?
3answers
339 views

2answers
278 views

### Manipulating OptionsPatterns[]

How do you combine OptionsPatterns? For example, I would like to have a function that can take both options that I specify, and options for all graphs: ...
1answer
173 views

### Efficiently keeping elements in a list (an input list) that exist in another list (a keep list)

I have some code that generates lists of integers (one such list is called, for example, inputList). I also have a "master list" of integers that should be kept, ...
1answer
269 views

### How to wrap this dynamic code inside a Manipulate?

My goal is to set up a Ising-type simulation, where many fast simulation steps are done in the background, and a visualization of the current state is displayed as the simulation evolves, being ...
3answers
2k views

### How to use FindFit to fit an implicit function?

Now I am trying to fit some data with a implicit model function. Firstly, I tried a toy example. Toy example with input and output ...
3answers
379 views

### Nested definition: How can I define a function with a passed-in expression?

Here's a simplified version of what I'm trying to do: ...
1answer
400 views

### What strategies can I use to evaluate a limit when Limit[] returns unevaluated

I'm trying to find the following limit using Mathematica: $$\lim_{N\to\infty}\sum_{k=1}^N\left(\frac{k-1}{N}\right)^N$$ The problem is taken from here and is known to converge to ...
3answers
1k views

### Correcting a correlation matrix to be positive semidefinite

Does Mathematica have a way to "fix" a correlation matrix that is not positive semi-definite? I looked through the documentation and search the internet but could not find anything.
6answers
2k views

### Convert an expression to a Function

I need a function which can take an expression and return a pure function based on the symbols in the expression. The symbols might have values so must be protected from evaluation. It is probably ...
1answer
593 views

### How to turn a random graph into a matrix

I have constructed a random graph with Mathematica using the RandomGraph command. Now I would like to convert this graph to a matrix, but I don't know how. The ...
2answers
264 views

### How to Rasterize in “Printout” style

I am trying to ascertain how large a justified text block will be when printed by rasterizing it in the "Printout" style environment. However, ...
1answer
173 views

### How can I make CDF which uses user defined function

I have a user defined function which is called many times in the code. I want to ask that when I am deploying the code toCDF, I need to define that user defined ...
3answers
378 views

### Table in a Legend

Calculated data: ...
2answers
580 views

### How to avoid this kind of numerical error caused by extreme parameters when using NDSolve?

Here I use a one-dimensional heat conduction equation as the example. I found that when the thermal diffusion coefficient is small enough, Mathematica will give a result against the second law of ...
2answers
391 views

### Series expansion with irrational power

I need the series expansion of a fairly nasty function and its derivative: ...
1answer
1k views

### Probability and distribution from actual data

Let's say I have some data from a real world system: ...
1answer
915 views

### How to find out available fonts from within Mathematica?

How to find out available fonts on the system from within Mathematica? When I do Style["foobar", FontFamily -> "Foobar"] how do I know which font the ...
1answer
927 views

### How to add a grid on Plot, ListLinePlot and ListPlot? [duplicate]

Possible Duplicate: How to insert guide-lines in graphics without specifying range? When we're using ArrayPlot, it's possible to draw a grid by doing: ...

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