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...

10 months 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 - ...

10 months ago | 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...

10 months 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...

10 months 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...

10 months 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,:)))))); ...

10 months ago | 1

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

10 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...

10 months ago | 2 answers | 3

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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...

10 months 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...

10 months 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...

10 months 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...

10 months 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...

10 months 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...

10 months ago | 1

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...

10 months 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...

10 months 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...

10 months 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? ...

10 months 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...

10 months 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-...

10 months 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 ...

10 months 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...

10 months ago | 0

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How do I return an extra parameter using Matlab's ODE solvers?
If the problems mentioned in my comment are fixed, the solution is easy: Run the integration at first. Then provide the calcualt...

10 months ago | 0

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Assign column index to output value
An easier way to create the submatrix: submatrix = M(i:end, :); The any() operates along the first non-singelton dimension. Fo...

10 months ago | 0

Index exceeds the number of array elements (4)
You stop Matlab at the error already by dbstop if error. Then use the debugger to check the sizes of the arrays: size(zplot) s...

10 months ago | 0

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Problem with Matrix indexing using vector
This is a job for sub2ind: a = blkdiag(ones(3),ones(3)); [r,c] = find(a); b = zeros(size(a)); index = su...

10 months ago | 0

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MEX passing Integer - wrong results
This sounds magic. Whenever magic things appear in discussions in the forum, or at programming in general, it is a secure signal...

10 months ago | 2

how to avoid for loop
A ,ore efficient version of the loop: nb = numel(b) - 1; counts = zeros(1, nb); % Pre-allocation!!! for i = 1:nb co...

11 months ago | 0

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Using matlab to find vectors that are orthogonal to another vector.
Do you mean 2D vectors? v = rand(1, 2) % Any test vector vp = [-v(2), v(1)] dot(v, vp) % Orthogonal means: dot pro...

11 months ago | 0

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