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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
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

| 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.

2 dagar 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)

4 dagar 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...

4 dagar 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(@()...

4 dagar 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_...

5 dagar 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"';...

6 dagar 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...

7 dagar 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')

7 dagar 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 ...

7 dagar 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)))

8 dagar 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...

9 dagar 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: ...

9 dagar 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...

11 dagar 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...

11 dagar 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 ...

11 dagar 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...

11 dagar 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...

11 dagar 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...

11 dagar 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...

11 dagar 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 ...

13 dagar 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...

14 dagar ago | 0

Answered
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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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...

15 dagar 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 = ...

15 dagar 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...

15 dagar ago | 0

| accepted

Answered
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

Answered
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

Answered
I can't open and uninstall due to the error, how to resolve it?
The message suggest to re-install Matlab. So do this: install it over the existing version.

18 dagar ago | 0

Answered
Read the original output variable of function
This is impossible. If the code is not visible for the user, the names of the variables are not visible also. But remember, that...

18 dagar ago | 0

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