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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Find doesn't seem to work with Matrix larger than 127x127
This observation does not match the facts: X = randi([0, 1], 150, 150); [i,j] = find(X); max(i) max(j) If you observe a ver...

ungefär 13 timmar ago | 0

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interp2 from 6x6 map to 500x500 map
Of course, 1*(0:1/N_mesh:1) has N_mesh+1 points. "But the image is not centered at the extremes..." - What does this mean? By ...

ungefär 16 timmar ago | 0

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Get special variable out of every struct in workspace
This is a bad coding design. Creating a bunch of variables causes much troubles. See here for an exhaustive discussion: https://...

3 dagar ago | 1

Answered
How to write this fuction in Matlab? I have an example code in Python
Assuming that b_1, b_2, r_1, r_2 are constants: % As anonymous function: r_1 = rand; % Define the constants r_2 = rand; b_1...

4 dagar ago | 1

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Why does my uicontextmenu only show after a pause/breakpoint?
Try to replace pause by drawnow. This allows the GUI to activate the updated properties. If this is working also, this is the ex...

5 dagar ago | 0

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Why do i get error when i reupload the GUI that i deleted before.
The solution is explained in the message clearly already: "Contact the File exchage If you want to upload the file again". Searc...

7 dagar ago | 0

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how to add header for new output file?
You want to copy the header? Read the first 15 lines and write it: [fid, msg] = fopen(file_paths{i}, 'r'); assert(fid > 0, msg...

7 dagar ago | 0

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Answered
i want the loop to run only one time, it keeps running until it subtract 84 instead of 6
Remember that length(A) replies the longest dimension. Maybe you meant height(A). Even if this replies the same value for the ex...

9 dagar ago | 0

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Unexpected high memory usage in MATLAB.
Avoid clear all, because it has no benefits. It removes all loaded functions from the RAM and reloads them from the slow disk th...

9 dagar ago | 1

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Answered
Escaped character '\U' is not valid. See 'doc sprintf' for supported special support.
It is a typical bug under Windows, which does not occur, when the software is tested successfully in Linux: fprintf(['Current f...

9 dagar ago | 0

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Detect if user has a valid MatLab license
The detection is not trivial. A matching license file might be there, but the license can be expired. The computer or license se...

9 dagar ago | 0

Answered
Generating 60 random samples that sum to 1, each subject to a unique lower and upper limit
Isn't this a job for: https://www.mathworks.com/matlabcentral/fileexchange/9700-random-vectors-with-fixed-sum ? % [x,v] = randf...

10 dagar ago | 0

Answered
checking if field values in a single struct are identical
Depending on how the inputs look exactly, maybe: FieldC = struct2cell(S); Eq = true; for k = 2:numel(FieldC) if ~isequal...

10 dagar ago | 0

Answered
Trying to extract data trail by trail, but my data is sampled at different sampling rate.
If one signal is measured with 1000 Hz and another with 2000 Hz, it is trivial to determine timepoints of the first one in the t...

10 dagar ago | 0

Answered
How not repeat the main loop, if other options are selected?
The description is not really clear. I assume, you want a list of menus to be selected one after the other. Then: status = 0; ...

12 dagar ago | 0

Answered
How can I generate the Radom number between two set of floating point number?
Gain0 = 0.0000250002787160545; Bias0 = -0.124315307973192; Gain = Gain0 + Gain0 * 0.18 * (rand(1, 160) - 0.5); Bias = Bias0...

12 dagar ago | 0

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Answered
How do I properly convert a 64-bit binary string / Convert directly from bin or hex to uint64
The question explains with many details, where the numbers are coming from. It would be more useful to post a set aof available ...

12 dagar ago | 0

Answered
Fast computation of entries of large matrix
n = 2500; x1=rand(n, 5); % some matrix with high number of rows and small number of columns > 1 x2=rand(n, 5); % anoth...

12 dagar ago | 0

Answered
2nd order euler method problem
You have to convert the 2nd order equation to a system of order 1 at first. Accumulating dx2/dt2 is not meaingful. The 2nd deri...

12 dagar ago | 0

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I tried dragging an image into the edit box for an answer on Matlab Central and doing so destroyed my answer.
Yes, I can confirm this behavior. For Firefox/Windows: When I drag an image into the field for editing (or anywhere else on th...

12 dagar ago | 0

Answered
Renaming multiple files in a folder
Folder = 'C:\Your\Folder'; FileList = dir(fullfile(Folder), 'Antenna_REF_*.s2p'); for k = 1:numel(FileList) oldName = Fi...

12 dagar ago | 1

Answered
How to vectorize nested loops with conditional statements?
tributary = randn([81, 126]); cp_mesh = randn([81, 126, 49792]); tic cp_B1_2 = zeros(49792, 1); for i = 1:4979 % 49792 ...

14 dagar ago | 0

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Answered
what does this error mean and how to fix it the image i imported was rgb and this error popped ,when its gray it works fine
imshow can handle RGB images as [M x N x 3] arrays and gray scale images as [M x N] matrices. The latter can be a logical matrix...

16 dagar ago | 0

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Answered
memoize => Save/Restore Cache
There is no documented way to store the cache. But it is cheap to create a look-up table for your function and store it manually...

16 dagar ago | 0

Answered
Select only the matrices within the cell
C = {rand(2), [], rand(3), [], [], rand(4)}; newC = C(~cellfun('isempty', C))

16 dagar ago | 0

Answered
how to create a struct that would have number of fields that corresponds to the number of iterations inside a loop and also automatically save this data
Result = struct(); for day = 1:7 % No loop needed: MPE1 = signal(:, :, day) - signal(:, :, day) - kE1 * (signal(:, ...

16 dagar ago | 0

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Answered
How to create all possible matrices of zeros and ones without having more than one '1' in the same column?
n = 3; m = 4; c = n^m; X = cell(1, c); % List of outputs v = n .^ (1-m:0); % Calculate expensive power operation once f...

17 dagar ago | 0

Answered
Error using plot vectors must be the same length
The error message is clear. Use the debugger to examine the reasons: dbstop if error Type this in the command window an run th...

17 dagar ago | 0

Answered
MATLAB and several command prompt commands
Try this under Windows: for i = 0:7 command = sprintf('tftp -i 192.168.178.100 get dmafiles-%d && exit &', i); % ...

17 dagar ago | 0

Answered
complicated vectorization of for loop wich icludes if and referes back to last loop iteration results
Why do you assume, that a vectorization is faster? Neither loops nor IF-conditions are slow in modern Matlab versions. Your cod...

18 dagar ago | 0

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