How do I select rows with particular step size?

2013 3 26
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Hi, I have a 25000 X 5 matrix. I need to select rows to create new subset of matrices with particular order of rows for e.g. 1,21,41,..., 2,22,42,....., 3,23,43,...and 20,40,60...... I would appreciate your input and thank you in advance.

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Mahdi
Mahdi 2013-3-26

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If A is the 25000 X 5 matrix, then you can just use:
A(1:20:end, :)
to get 1,21,41,... from all of the columns. If you want data from just the first column, use
A(1:20:end, 1)
Look at what the : operator does to help you.

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