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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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Answered
Can you help me with an error on my GUI program ?
Do not append folders to Matlab path only to import files. This is a source of unexpected behavior. Include only the folders con...

ongeveer 13 uur ago | 0

Answered
How to preallocate 2D array before for loop?
Do not collect the points, but a list of their indices. If you use logical indexing, you can omit the expensive unique also: n ...

ongeveer 19 uur ago | 1

Answered
Decrease spacing between plots in matlab
You find many code for modyfying the position of subplots in the FileExchange: https://www.mathworks.com/matlabcentral/fileexch...

1 dag ago | 0

Answered
Automatic Download from a Url when the file of the date is inputted by the user
This can be implemented with sprintf() or compose() easily. url_https='https://data.cosmic.ucar.edu'; for year = 2020:2022 % ...

1 dag ago | 0

| accepted

Answered
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...

2 dagen 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],...

3 dagen ago | 0

Answered
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); ...

3 dagen ago | 0

| accepted

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...

4 dagen ago | 0

Answered
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 ...

4 dagen ago | 1

| accepted

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.

7 dagen ago | 0

Answered
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)

9 dagen 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...

9 dagen ago | 0

| accepted

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(@()...

9 dagen ago | 1

| accepted

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_...

9 dagen ago | 0

Answered
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"';...

11 dagen ago | 0

Answered
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...

11 dagen ago | 0

Answered
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')

12 dagen ago | 1

| accepted

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 ...

12 dagen ago | 0

| accepted

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)))

13 dagen ago | 1

| accepted

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

14 dagen ago | 0

| accepted

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: ...

14 dagen ago | 0

Answered
'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...

15 dagen 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...

15 dagen ago | 0

| accepted

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 ...

15 dagen ago | 0

Answered
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...

15 dagen ago | 0

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

16 dagen ago | 0

| accepted

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...

16 dagen ago | 0

Answered
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...

16 dagen ago | 0

| accepted

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

17 dagen ago | 0

Answered
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...

18 dagen ago | 0

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