Community Profile # Jan

Last seen: Today Active since 2009

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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How to speed up this calculation and remove loop(s)?
There is a very small potential for optimizing in the posted code: for row = 1:size(oFD,1) c1 = oFD.PS(row); c2 = oFD...

12 hours ago | 0

Access data in cell and save as vector with corresponding variable name
Data = struct(); % [EDITED], was: struct([]); for k = 1:numel(tableCell) C = tableCell{k}; NameList = T.Properties.V...

17 hours ago | 0

Vertcat error when concatenating images in loop
vertcat(Sro) concatenates Sro with nothing. What is the purpose of this command? Ask Matlab, what the problem is: for i = 1:le...

18 hours ago | 0

csv file to text file
% [UNTESTED CODE!] function Value = GetCSVElement(File, R, C) % INPUT: File: File name % R: Row index of wanted element. 1 r...

18 hours ago | 0

loop over variable with different characters
This shows, that you have created a bunch of variables and stored important information in the name of the variables. This desig...

18 hours ago | 0

Efficient way to assign indices to variables in a matrix
[~, Result] = ismember(A, B(:, 4)); A look up table is even faster: Instead of searching the element A(i,j) in B(:, 4), create ...

20 hours ago | 0

Why sprint doesn't show a zero value from an array?
Reduce the clutter: a=[1:450:2251]; % Easier: a = 1:450:2251; [] is Matlab operator for a concatenation. [1:450:2251] concat...

21 hours ago | 0

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How to interleave data from 2 doubles of differing length?
A=[1420;2956;4492;6028]; B=[2960;3152;3344;3536;3728;3920;4112;4304;4496;4688;4880;5072;5264;5456;5648;5840]; [C, idx] = sor...

1 day ago | 0

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Load multiple *.mat files and save outputs using loop without overwriting the previous file
filePattern = fullfile(myFolder, '*.mat'); theFiles = dir(filePattern); nFiles = numel(theFiles); % not size() Out = cell...

2 days ago | 0

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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; % ...

3 days ago | 0

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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...

3 days 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...

4 days 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 = ...

4 days ago | 0

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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...

7 days 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...

9 days 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...

9 days 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...

11 days 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...

13 days 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-...

13 days 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(., .) ...

13 days 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,:), ... ...

14 days 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...

15 days 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...

15 days 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,...

15 days 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.

15 days ago | 1

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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); % ...

15 days ago | 1

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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...

15 days ago | 1

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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...

15 days ago | 0