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Jan


Last seen: 1 day ago
12,570 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.

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Answered
uiopen vs audioread, is there an advantage to one over the other for .wav files?
The function uiopen and audioread have two different jobs. While the first opens Matlab files with the apropriate application, t...

1 day ago | 0

Answered
Can't run an external program with arguments
Under Windows the folders in the PATH a separated by semicolons, not colons. Do you mean: cmdStr3 = 'set path=%path%C:\Program ...

1 day ago | 0

Answered
Slow SizeChangedFcn or ResizeFcn
The first version was not sufficient in all cases. In addition it is required to prevent a repeated entering of the code: funct...

2 days ago | 0

Answered
Slow SizeChangedFcn or ResizeFcn
One solution is to ignore the built-in resize methods and use a specific WindowsButtonDownFcn to emulate a resizing. But reinven...

9 days ago | 0

Answered
Is it possible to programmatically check whether MATLAB has been started with the "-nodisplay" option?
See also: https://www.mathworks.com/matlabcentral/answers/407059-if-matlab-desktop-elseif-matlab-nodesktop : usejava('desktop')...

9 days ago | 1

Question


Slow SizeChangedFcn or ResizeFcn
When a SizeChangedFcn or ResizeFcn takes some time, the figure size can be changed, until the display is updated. Example: func...

11 days ago | 2 answers | 0

2

answers

Answered
Vector between vectors in intervals
Remark: The inputs vectors are not normalized and only almost orthogonal: format long g v1 = [-0.0345; 0.9984; -0.0447] v2 ...

8 months ago | 0

Answered
Can anyone help me with the "Axis rotation sequence for the Euler angles"
The rotation matrix for the Euler angles in the order XYX is: s1 = sin(alpha); c1 = cos(alpha); s2 = sin(beta); c2 = cos(bet...

8 months ago | 1

Answered
Matlab has encountered an internal problem and needs to close.
The message teels you: If this problem is reproducible, please submit a Service Request via: http://www.mathworks.com/...

8 months ago | 0

Answered
Use the time step within ode15s
If the function to be integrated requires the time steps of the solver, something went wrong. I'm convinced that this is a logic...

8 months ago | 0

| accepted

Answered
Keep getting error message on my ODE function
u0 = [P0, zeros(1, N + 1)];

8 months ago | 0

| accepted

Answered
Eulers method for system of linear equations
h = 0,1; % ^ you mean 0.1 with a dot There is no need to create the accleration as array. Reply a scalar instead: funct...

8 months ago | 0

Answered
Skipping files in a set
What does "files 132, 290, and 404" mean? Are these the indices in rightfiles, or are these parts of the file name? rightfiles=...

8 months ago | 0

Answered
How to sum over indices?
If you assume, that something is wrong, mention, what you observe. This is better than letting the readers guess, what the probl...

8 months ago | 1

| accepted

Answered
How can I convert a binary fraction to decimal?
'11001' means: 1*2^0 + 0*2^1 + 0*2^2 + 1*2^3 + 1*2^4 or: [1,1,0,0,1] * 2 .^ (4:-1:0).' (this is what happens inside bin2dec - ...

8 months ago | 3

| accepted

Answered
How do I install MinGW for old Matlab R2007?
Matlab R2007 is not supported under Windows 7. MinGW is not supported for Matlab R2007. In consequence the combination of a mode...

9 months ago | 0

Answered
How do you form a while function using a function file and then using the function file to form a sequence by performing this operation?
Change n directly and collect the output in the vector v by inserting it at the index end+1: function v = collatz(n) v = n; w...

9 months ago | 0

| accepted

Answered
Using parfor in a sparse setting
The help page "Troubleshoot Variables in parfor-Loops" explains the problem: A = [1;2;3;4;nan;nan;nan;nan;nan;10;11]; B = na...

9 months ago | 0

| accepted

Answered
Speed up nested loops
This line is expensive: normal_vector = ((cross(P_all(k-t,:),P_all(k,:)) / ... (norm(cross(P_all(k-t,:),P_all(k,:)))))); ...

9 months ago | 1

| accepted

Answered
Table of Matlab release features
%{ Version Release Notes 1 1984 2 1986 3 1987 3.5 1...

9 months ago | 3

Question


Table of Matlab release features
After reading Rik's comment I looked for a list of Matlab releases and their corresponding features. Wiki: Matlab contains an ex...

9 months ago | 2 answers | 3

2

answers

Answered
Does Matlab perform well on AMD Ryzen?
It depends if the used libraries call FMA3 commands. If so, the Ryzen crashes very fast. The performance will depend on your pr...

9 months ago | 0

Answered
Why is my code showing an error? Why is the line deleted?
The shown code does not reproduce the problem. We cannot guess reliably, why one of the obejcts in h is deleted. But a weak gues...

9 months ago | 0

Answered
variable size matrix and converting letters to numbers
"user enter a variable size matrix": It depends on how you want to implement this: by a GUI, as Matlab code, as text file, in Ex...

9 months ago | 0

| accepted

Answered
Help on understanding the following matlab code ?
Step by step: flipud(xt): This flipps the order of elements vertically. Try it: x = rand(3,2) flipud(x) min(Y, [ ], 2) : fin...

9 months ago | 0

| accepted

Answered
Resuming from "keyboard" command?
Using debug commands for an interaction with the user is a really bad design. A dynamic modification of the workspace is very fr...

9 months ago | 0

Answered
Memory usage very high
How do you observe the memory consumption? The Taskmanager displays the memory reserved for Matlab. If Matlab allocates memory a...

9 months ago | 0

Answered
Return vectors from for loop as columns in matrix
Start with cleaning up the code. The lines Dplus; and Dminus; do nothing, so they are wasting time only and confuse the readers...

9 months ago | 1

Answered
convert lower case to upper and upper to lower
You can use the function isstrprop with the category 'lower' and 'upper' to identify the specific characters. Then use the comma...

9 months ago | 0

Answered
Function run(scriptname) doesn't work.
Store the M-files in a folder, in which you have full access. C:\Users\ is a bad idea. Create a folder somewhere else, e.g. insi...

9 months ago | 0

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