Extract submatrix at certain row/col values

Question

I need to slice a 2D input array from row/col indices and a slicing distance. In my example below, I can extract a 3x3 submatrix from an input matrix, but I cannot adapt this co

Answer 1

Numpy has matrix slicing, so you can slice on both rows and columns.

mat_A[4:7, 4:7]

returns

  [[44, 45, 46],
   [54, 55, 56],
   [64, 65, 66]]