How to remove certain rows and columns in a matrix?

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Ali
Ali 2020-7-10
评论： Ali 2020-7-10
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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采纳的回答

madhan ravi
madhan ravi 2020-7-10
编辑：madhan ravi 2020-7-10
w = A([1,2,7,8], :)
Wanted = w(:, [1,2,7,8])

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