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# Jan

12,564 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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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 ...

2 days ago | 0

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...

7 days ago | 0

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 days ago | 0

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 days ago | 0

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

8 days ago | 0

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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 days ago | 0

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 days ago | 0

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 days ago | 1

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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 days ago | 3

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

9 days 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 days ago | 2 answers | 3

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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...

13 days ago | 0

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...

13 days ago | 0

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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...

13 days ago | 0

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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,:)))))); ...

13 days ago | 0

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...

13 days ago | 0

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...

13 days ago | 0

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...

14 days ago | 0

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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...

14 days ago | 0

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...

14 days ago | 0

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

14 days ago | 0

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...

14 days ago | 1

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...

15 days ago | 0

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...

15 days ago | 0

Subtracting Vector from a Matrix
Matlab can subtract vectors from matrices automatically since R2016b - so called "auto expanding". Do you use an older version? ...

15 days ago | 0

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Include global variable declaration infunctions
Global variables are a shot in your knee in every case. Hiding them in scripts, which are called dynamically, impedes the debugg...

15 days ago | 0

deleted old version of Matlab (R2017b) keeps getting back
See https://nektony.com/how-to/uninstall-matlab-mac According to https://www.mathworks.com/help/install/ug/uninstall-mathworks-...

15 days ago | 1

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I found this bellow code in internet. While I run the code I noticed following errors.
This is a strange and inefficient code. Replace e.g. for i=1:len for j= 2:2 text_names(i,j)=txt(i,j); end ...

15 days ago | 0

Vectorise or Parallel Computing
This loop cannot be parallelized. If flux_edge is a vector and not a matrix, accumarray would solve the problem efficiently. Try...

15 days ago | 0

| accepted