How to remove certain rows and columns in a matrix?
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I have this 8x8 matrix and I want to preserve only the 1, 2, 7 and 8 (for now, these numbers change based on a computation) rows and column to get a 4x4 output matrix. How can I delete other columns and rows or copy the forementioned rows and columns to a new matrix with a new 4x4 structure?
Keep in mind that the desired rows and columns change based on a function computation.
A = [
0 1 0 0 0 0 0 1
1 0 0 0 0 0 1 0
0 0 0 0 1 0 0 0
0 0 0 0 0 1 0 0
0 0 1 0 0 0 0 0
0 0 0 1 0 0 0 0
0 1 0 0 0 0 0 1
1 0 0 0 0 0 1 0 ]
Desired output (for this context):
A = [
0 1 0 1
1 0 1 0
0 1 0 1
1 0 1 0 ]
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