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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Out of memory error
32*20*1024*2047*42* 8 byte per element => Your array snack uses 451 GB RAM. If alldat contains additional data, the total amount...

4 hours ago | 0

Answered
After using griddata, standard deviation is changed.
Of course increasing the number of points by an interpolation reduces the standard deviation: std([1,100]) std(interp1([1, 2],...

22 hours ago | 0

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how to find a number in cell and make it NaN?
Start with a simple loop: A = {[1,2], [3,4], [5 31], [31,6]}; B = A; for k = 1:numel(B) b = B{k}; m = (b == 31); ...

22 hours ago | 0

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Answered
Why this message appears?
The message is clear: "Out of memory" means, that the size of the data, you try to load, exceeds the available RAM. Install mor...

2 days ago | 0

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Why the function "timeit" doesn't work correctly
timeit and tic/toc measure the runtime. If they determine a runtime of 4 seconds in Matlab R2014 and just 0.3 seconds in Matlab ...

3 days ago | 1

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Answered
Getitng error suggesting that I should "Use rotate(app, ...) to call this function.". How should I format my code?
rotate is a built-in function: https://www.mathworks.com/help/matlab/ref/rotate.html Use another name for your function.

5 days ago | 0

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how can I plot y = (cos(t-2)/4)(rect(t+1)/6 )?
y = @(t) cos(t-2) / 4 .* rect(t + 1) / 6; fplot(y)

7 days ago | 0

Answered
How to concatenate numbers with ( ) bracket as cell type?
As Walter said already: If it contains parentheses ( and ), the elements of the cell cannot be numerical. in = [-5,21,-5;-5,21...

7 days ago | 0

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Answered
Using find() is faster than direct logical indexing?
No relevant difference in R2022a in the forum: A=randi(100, 5e3, 5e3); % Few elements only timeit(@() useFind(A)) timeit(@()...

7 days ago | 1

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Answered
speed up for and if loop
isnan replies trtue or false. There is no need to compare it with ==1 afterwards. nWasserhoehe = size(Wasserhoehe_HQ, 1); FRI_...

7 days ago | 0

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Print a specific PDF file using its path?
Guessing, that you use Windows: Acrobat = '"C:\Program Files\Adobe\Acrobat DC\Acrobat\Acrobat.exe"' PDFFile = '"C:\your.pdf"';...

9 days ago | 0

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For-looping output not adequate
new_parameter(i) = T2(i) - T2(i-(time*mult)); In the first iteration the i.th element of the vector new_parameter is ca...

9 days ago | 0

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missing parts of a figure when converting to pdf
Copied from my suggestion in the comments: Disable the clipping of the axes object: axes('Clipping', 'off')

10 days ago | 1

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Answered
How may I use reshape for this code?
Your loop method overwrites b(j) repeatedly. Setting count to 0 in two lines is confusing. Simpler: for j = 1:frame_number ...

10 days ago | 0

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Answered
How to calculate execution time in Matlab?
The direct method: tic x = sin(rand(1e4, 1e4)); toc The smart method: timeit(@() sin(rand(1e4, 1e4)))

11 days ago | 1

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Answered
Iteration repeat several times
Avoid including each variable in parentheses. This reduces the readability. Matlab processes terme from left to right. Then: i...

12 days ago | 0

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Answered
How to get internet time?
This java code does not run here in the forum. Maybe it is blocked by a firewall. Please try it in your local Matlab instance: ...

12 days ago | 0

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'improfile' is a missing function in octave, what other options could I use to make my loop works?
The command interp2(I, 2) does not consider the selected line. Better: n = ceil(norm([diff(x), diff(y)])); % A rough estimatio...

13 days ago | 1

Answered
Hide excel sheet form Excel file
According to the links you have posted it should work like this: Sheet = get(Sheets,'Item',2); Sheet.Visible = 'xlShee...

13 days ago | 0

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Answered
Numerical Inaccuracies for Ranges of Parameters When Using ode45 for Two Identical (But Transformed) Systems
I confirm the observed instabilities. The result depends critically on the initial value and the parameters. The trajectory has ...

13 days ago | 0

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xlim not working in 'loop' plots..
You do not call the function xlim() at all, but create a variable with the same name. Replace: xlim=([1 100]) by xlim([1 100...

13 days ago | 0

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find certain numbers in txt file
FileName = '20220727_150919_results.txt'; S = fileread(FileName); C = strtrim(strsplit(S, newline)); m = find(strcmp(C, 'Shad...

14 days ago | 0

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Answered
for loop for signal with changing conditions?
Do you mean: for i = 1:length(MomentRechts) % Instead of: for i´= length(MomentRechts) This command processes the comple...

14 days ago | 0

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every for loop never stops running
Neither uninstalling Matlab nor a virus scanner can be the solution. Don't try wild things, because "gunshot-programming" is not...

14 days ago | 0

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Answered
Error in multi-screen
Most of the messages are just informations. The actual error is: Error in posner_forpilotingerps_June32022 (line 50) fixation ...

16 days ago | 0

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how to modify the variables for changing FOR loop to PARFOR loop??
What is the bottleneck of your code? Use the profiler to find it. If it is the water() command, parallelize this command: lArra...

16 days ago | 0

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How to downsample the 3D matrix in matlab??
X = rand(1500, 1500, 1700); % 28.5 GB - does not run in the forum! Y = reshape(X, 2, 750, 2, 750, 2, 850); Z = squeeze(sum(Y...

17 days ago | 0

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Answered
I AM WRITTINF THIS CODE AND GETTING THE FOLLOWING WARNING
Check this again: which image -all Is there a user-defined function in the list? If not, clear all should solve the problem a...

17 days ago | 0

Answered
Changing elements of row after certain element of m*n matrix
x = [-1, -0.65, -0.45, 0, 0.3, 0.8, 1, 0.4, 0.2, -0.1; -1, -0.65, -0.45, 0, 0.3, 0.8, 0.9, 1, 0.2, -0.1]; idx = ...

17 days ago | 1

Answered
Find the value of r such that the determinant of A is zero.
Remember, that Matlab uses IEEE754 doubles with limited precision. Then -5.5511e-17 is almost 0. The result is correct. See: ht...

17 days ago | 0

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