# Jan

It is easier to solve a problem than to guess, what the problem is. Questions about FileExchange submissions are welcome - get my address from the code. I do not answer mails concerning questions in the forum.

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**Content Feed**

How to know the exact colour after a level of transparency being applied?

The color you see through a semitransparent element depends on the background. The rule is simple: alpha = rand; % ...

alrededor de 7 horas ago | 0

Remove the 1x1 Cell Array from the Cell Array

If you want D{1} = [2, 1], use: D{1} = [2, 1] % or equivalently D = {[2, 1]} Expanded: D = {[2,1], [1,2,0]} D{1} D{2} Ma...

alrededor de 7 horas ago | 0

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code no good :(

areaOriginal = area(widthOriginal,thicknessOriginal); This creates a diagram and returns the handle to the graphics object. ar...

1 día ago | 0

How to treat select elements from within multiple cells as a single vector

C = cell(5, 4); C(:) = {2:5}; % Faster than with DEAL V = cellfun(@(x) x(1,1), C(2:end,1), 'UniformOutput', 1) V = ...

1 día ago | 0

| accepted

Error while running matlab script from Linux terminal

Is this a script or function? Obviously it is not included in the PATH. So either change the current path or add the folder to t...

4 días ago | 0

Add code to have switch repeat if a case is not met

knownLevels = {'easy', 'medium', 'hard'}; Levels = [10, 50, 100]; fprintf('\nChoose one of the known levels: %s\n', strjo...

6 días ago | 0

When calling a user defined function, MATLAB throws an error for simple matrix multiplication

Use the debugger to examine the problem: dbstop if error Run your code again afterwards. If it stops at the error, check the d...

6 días ago | 1

Is it possible to programmatically check whether MATLAB has been started with the "-sd" option?

PID = feature('getpid'); [status, out] = system(sprintf('ps -p %d -o args', PID)) Parsing the char vector out is not trival: E...

9 días ago | 0

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Generating a combination matrix within a certain condition

After some test I could simplify the original combvec and including the limit is easy also: % Without limit, but considering th...

10 días ago | 1

How can I apply filter with loop-based function instaed of using filter( ) : built in MATLAB function?

You can find a Matlab function for filtering here: https://www.mathworks.com/matlabcentral/answers/9900-use-filter-constants-to-...

11 días ago | 0

Generating a combination matrix within a certain condition

It is easy to modify the code of a copy of Matlab's combvec function, which uses the class of the input: Change the zeros(., .) ...

11 días ago | 1

How could I possibly iterate over three 3D arrays and use their variable names iteratively in the title and axes?

v_dx = struct('EField_h', EField_h(idx_phi,idx_theta,:), ... 'EField_v', EField_h(idx_phi,idx_theta,:), ... ...

12 días ago | 0

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When I import google sheet into Matlab, I get the first line imported as the url for my google account sign in

If the file starts with <!doctype html><html lang="en-US" dir="ltr"><head> it is an HTML file, not a JSON file. Then jsondeco...

13 días ago | 0

How to display a single element from a matrix?

Indexing is a fundamental Matlab method. To learn the basics asking in the forum is less efficient than using the tutorials: Ge...

13 días ago | 0

How can I import multiple fig files into a single figure in a tiled layout?

Using a vector as 3rd input in subplot allows to span an axes over multiple blocks of the layout: FigH = figure; subplot(2, 3,...

13 días ago | 0

When triying to oppen a .m file instead of the editor oppening, a command prompt appears

Open the section "Editor/Debugger" in Matlab's preferences and select "MATLAB editor" as editor.

13 días ago | 1

| accepted

Artefacts when filtering a contiguous signal

The final state of the filter parameters after the 1st block is not the value of the signal. Replace: zi = vec1(end-2:end); % ...

13 días ago | 1

| accepted

How can I calculate trapz value based on an event counter and then plot it?

As far as I understand your code was almost working. I added an if condition to skip scalar data and shifted the index for the o...

13 días ago | 1

| accepted

Polyfit polynomial badly conditioned on Linux whereas on Mac no warnings

The warning is serious. Although the results look find in your case, scaling the input is the way to go for a scientifically sta...

13 días ago | 0

Turn code into function

Instert one line on top: function ANameOfYourchoice and save the file as "ANameOfYourchoice.m".

13 días ago | 0

Running two very similar scripts, getting different resolution figures when exported.

It looks like one of the figures uses painters and the other one OpenGL as renderer. OpenGL is enabled automatically, if a more ...

14 días ago | 1

| accepted

How to generate a specific number of values within a range ?

R = size(Q,1); First_second_ele = zeros(R,2); Y = zeros(R, 60); for k = 1:R tmp = nonzeros(qm(k,:)); %extraction f...

14 días ago | 0

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What is wrong with for loop iteration that is put in a function?

function bool = composite(n) bool = false; % Create a default value if n > 2 for i = 2:n for j = 2:n ...

16 días ago | 1

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How to define a function with multiple handle in a loop?

Is there a need to use an anonymous function? Why not writing a standard function? function y = pA(tau, s1, s2, s3) a=80/365...

16 días ago | 0

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How can i achive this kind of plot?

Go to the FileExchange and search for "radar" or "spider" plots.

16 días ago | 0

| accepted

Cell array and num2str comparison

The variable a is a cell array containing 2 scalar numbers, while b contains 2 CHAR vectors. a = {42, 12} c = {'42', '12'} Th...

16 días ago | 1

| accepted

MATLAB PCode Warning on R2021a

This can happen only, if somebody has edited the file isprop.m . Modifying Matlab's built-in functions is not useful and this ca...

17 días ago | 0

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Intersect() with with repetition

If you really need the redundant information in iAB_C, iAB_Cprime, idx1, idx2, this is faster than the original version tested w...

18 días ago | 0

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How to quickly calculate the following function？

See also: https://fredrikj.net/blog/2022/02/computing-the-lerch-transcendent/ Calculating the sum seems to be more stable. F...

24 días ago | 0

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Artifacts when converting .svg to pdf

The output is fine, if I open your SVG in Edge and print it to a PDF using doPDF (by the way: version 7, the modern versions are...

25 días ago | 0