How to select columns in a matrix of variable size?

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I have a matrix that I am trying to split into two separate matrices. The original matrix is composed of an unknown number of columns but will always be divisible by 3. I am trying to create a new matrix composed of the 1st column of the original matrix and then every 3rd column after that. E.g. Columns 1,4,7,10.....
I am also trying to create a new matrix that is composed of all of the columns not counted in creating the other new matrix. E.g. Columns 2,3,5,6,8,9.....
How would I go about doing this?

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 28 Aug 2016
Edited: Azzi Abdelmalek on 28 Aug 2016

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