Community Profile

photo

Jan


12.505 total contributions 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.

Jan's Badges

  • Grand Master
  • Revival Level 4
  • 36 Month Streak
  • Thankful Level 4
  • Knowledgeable Level 4
  • First Answer
  • Promoter
  • Commenter
  • Solver

View details...

Contributions in
View by

Answered
Error after moving function .m file: 'Previously accessible file "...\z_estimate.m" is now inaccessible'
"saved the file in the top-level MATLAB folder instead of the subfolder "my_functions", which is also on my Matlab path" This s...

circa 4 ore ago | 0

Answered
From Euler Angle to Angle between 2 vectors
There is no mathematical definition of "one angle between 2 3D-bodies". There is more than 1 degeree of freedom. An angle betwee...

2 giorni ago | 0

Answered
Error Index exceeds matrix dimensions
After [x ,y] = min(Data(i)); x is a scalar. Then x(i) cannot work for i > 1. By the way, as Adam has said alread, x(i)=x(i) ...

2 giorni ago | 0

Answered
Coding for nested loop problem
for p = 1:10 for q = 1:10 if p ~= q ... end end end Without a for loop: x = rand...

2 giorni ago | 0

| accepted

Answered
Data filtering(Give a constraint to the length of each index )
There are more efficient ways, but starting with a simple loop is a good apporach: data = [ 1 201; 1 202; 2 301; 2 313; 2 311;...

3 giorni ago | 1

| accepted

Answered
Creating 1024 ToggleButtons with almost the same callback
A simplified version of your code: function buttonPress(hObject, EventData, handles) global TData brtn = get(handles.slider1,...

4 giorni ago | 0

| accepted

Answered
lock first app if second is running
You can use waitfor in the main function and provide the handle of the uifigure. [EDITED] I assume, that https://www.mathwork...

7 giorni ago | 0

| accepted

Answered
How to introduce a phase shift to a existing vector
This is not possible, if you do not have additional information. You can apply a phase shift with a certain number of elements, ...

18 giorni ago | 1

Answered
question regarding 'copyfile' function from folder to folder
This is exactly, what you find in the documentation. Please read: help copyfile doc copyfile [SUCCESS,MESSAGE,MESSAGEID] = ...

18 giorni ago | 0

| accepted

Answered
To take pictures from FLIR (Cx series) camera every 30 secs
Use a timer object and insert the code for taking a picture in its callback. doc timer

23 giorni ago | 1

Answered
Changing the name of a variable throughout the code but only want it to change in a section.
Copy the text block, which you want to modify, to a new editor window. Perform the wanted modifications. Copy the block back to ...

23 giorni ago | 0

Answered
How can I use "system" command with input without typing myself all the input everytimes ?
Please take a look into the documentation of dammif: https://www.embl-hamburg.de/biosaxs/manuals/dammif.html Here you can see h...

23 giorni ago | 1

| accepted

Answered
Efficient algorithm for a duplication matrix
For n=300 this needs 1.3 sec instead of 27.5 sec: tic m = n * (n + 1) / 2; nsq = n^2; D = spalloc(nsq, m, nsq); row = 1...

24 giorni ago | 1

| accepted

Answered
How to detect change in mean value of a signal
It is impossible to detect a change, if it occurs in the first or last few frames. Ist there only 1 change of the mean? Then f...

25 giorni ago | 0

Answered
How can I export only specific data from a text file to a matrix?
With some guessing, that you want the part behind ':Solar_Radio_Flux:' : Key = ':Solar_Radio_Flux:'; Str = fileread(FileName)...

28 giorni ago | 0

| accepted

Answered
Parse error help please
I guess, this line is failing: Jsx*der(wx) = (Fflz + Frlz)*w/2 - (Ffrz + Frrz)*w/2 + (Ffyv + Fry)*h; Yes, of course. In Matlab...

28 giorni ago | 0

Answered
Alternative to delaunayn function supported by MATLAB coder for the C++ code generation
Matlab uses qhull for the calculation of delaunayn. qhull is a library written in C, see here: http://www.qhull.org/ So it shou...

28 giorni ago | 1

| accepted

Answered
decrease the elapse time
The output of the profile is useful - thanks. The most time is spent here: [days(:,:,i), time(:,:,:,i), I(:,:,:,i), Ta(:,:,:,i...

28 giorni ago | 0

Answered
How would I change the color of the angular axes without changing the color of the grid lines in polar plot
AxesH = polaraxes; theta = 0:0.01:2*pi; rho = sin(2*theta).*cos(2*theta); polarplot(AxesH, theta, rho) AxesH.GridColor...

29 giorni ago | 0

Answered
I do not understand why my code still gives me errors
Index exceeds the number of array elements (1). Error in RK (line 8) k(:,1)=feval(fun,t(j),y(:,j)); After the line: ...

29 giorni ago | 1

| accepted

Answered
Index exceeds matrix dimensions ERROR
Using global variables is a bad programming style. It impedes the debugging massively. It is hard to find out, which code has se...

29 giorni ago | 0

Answered
How to convert 24-bit signed hex from .csv file to an array of decimal data?
dataTable = readtable('demo.csv'); data = table2array(dataTable(:,1)); data = strrep(data, '0x', ''); dataDec = b...

circa un mese ago | 1

| accepted

Answered
Indexing cell array similar to excell
Maybe like this: Data = rand(7, 25); % Example data, actually 177x25 Names = {'A 123', 'A 123', 'B 456', 'A 123', 'B 456', '...

circa un mese ago | 0

| accepted

Answered
Calling Matlab GUI popupmenu callback on click
No, there is no callback in the Matlab level. You can use the Java callbacks, if your "Matlab GUI" is a figure, see https://und...

circa un mese ago | 0

Answered
part of file name
s = ' Hello_World_2020 ' c = strsplit(s, '_') c{2}

circa un mese ago | 0

Answered
looping though multiple sub-directories
FileList = dir('C:\Base\Folder\**\*.nii'); for k = 1:numel(FileList) File = fullfile(FileList(k).folder, FileList(k).name)...

circa un mese ago | 0

Answered
How to open my .m files in App Designer?
You do not have to open the files to use a slider for te modification of a constant. You need to write the code as a function, w...

circa un mese ago | 0

| accepted

Answered
array values are overwritten
Prefer file names including leading zeros: image0001.jpg, image 0002.jpg etc. Then the numeical order equals the alphabetical or...

circa un mese ago | 1

| accepted

Answered
Delete table from GUI app variable
Perhaps you mean: delete(app.table)

circa un mese ago | 0

Load more