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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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 ...

ungefär en timme ago | 1

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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.

2 dagar ago | 0

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)

4 dagar ago | 0

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...

4 dagar ago | 0

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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(@()...

4 dagar ago | 1

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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_...

5 dagar ago | 0

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"';...

6 dagar ago | 0

new_parameter(i) = T2(i) - T2(i-(time*mult)); In the first iteration the i.th element of the vector new_parameter is ca...

7 dagar ago | 0

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')

7 dagar ago | 1

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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 ...

7 dagar ago | 0

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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)))

8 dagar ago | 1

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

9 dagar ago | 0

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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: ...

9 dagar ago | 0

'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...

11 dagar ago | 1

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...

11 dagar ago | 0

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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 ...

11 dagar ago | 0

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...

11 dagar ago | 0

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

11 dagar ago | 0

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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...

11 dagar ago | 0

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...

11 dagar ago | 0

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

13 dagar ago | 0

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...

14 dagar ago | 0

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...

15 dagar ago | 0

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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...

15 dagar ago | 0

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 = ...

15 dagar ago | 1

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...

15 dagar ago | 0

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startup script for whole team
I use a tool to syncronize a function, which is updated by others in this forum: https://www.mathworks.com/matlabcentral/answers...

17 dagar ago | 0

create function in loop
Simplify F_sum4 = 0; start=1; stop=810; for n = start:stop F_sum4 = F_sum4 + F(:,:,n) CY_sum4 = mean(cy_sum(start:...

18 dagar ago | 0

| accepted