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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 ...

circa 2 mesi 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...

2 mesi 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/...

2 mesi 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...

2 mesi ago | 0

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

2 mesi 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...

2 mesi 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=...

2 mesi 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...

2 mesi 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 - ...

2 mesi ago | 3

| accepted

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

2 mesi 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...

2 mesi 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...

2 mesi 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...

2 mesi 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...

2 mesi 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,:)))))); ...

2 mesi ago | 1

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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...

2 mesi 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...

2 mesi 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...

2 mesi ago | 0

| accepted

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...

2 mesi ago | 0

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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...

2 mesi 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...

2 mesi 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...

2 mesi 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...

2 mesi 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...

2 mesi 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? ...

2 mesi 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...

2 mesi 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-...

2 mesi ago | 1

| accepted

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 ...

2 mesi 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...

2 mesi ago | 0

| accepted