HP 40gs how to get a submartix from a matrix

[Thomas Klemm]

I'm not familiar with the HP 40gs but you could use matrix multiplication.

In Python:

Code:

import numpy as np

M = np.array(
    [
        [1, 2, 3],
        [4, 5, 6],
        [7, 8, 9],
    ]
)

U = np.array(
    [
        [0, 1, 0],
        [0, 0, 1],
    ]
)

V = np.array(
    [
        [0, 0],
        [1, 0],
        [0, 1],
    ]
)

U @ M @ V

The result is:

Code:

array([[5, 6],
       [8, 9]])