How to select a fixed number of rows with constant spacing?

Hello,

I am sure there is an easy fix for my problem but I just can't figure out.

I am trying to extract 21 rows out of matrices. The spacing between the 21 rows should be constant for a given matrix with the first and last selected rows being the first and last rows of the matrix. I have tried to use the following code:

sel = mat(1:floor(size(mat,1)/20):size(mat,1),:);

but the problem is that as mat changes size, I do not always obtain 21 rows in sel.

Would someone have a solution for me?

Thank you,

Benoit

Answer 1

[Azzi Abdelmalek]

A=rand(210,10); % example
A(fix(linspace(1,size(A,1),21)),:)

Answer 2

[Benoit]

That is awesome. Thank you Azzi Abdelmalek