Organize the logic to transform given matrix into required

Given

[1 5 4 5 7

2 5 5 5 8

3 5 6 5 9]

Required

[1 2 3

4 5 6

7 8 9]

Answer 1

[Voss]

A = [1 5 4 5 7; 2 5 5 5 8; 3 5 6 5 9]

A = 3×5

1 5 4 5 7 2 5 5 5 8 3 5 6 5 9

B = A.'; % transpose
B = B(1:2:end,:) % take every alternate row, starting with 1st

B = 3×3

1 2 3 4 5 6 7 8 9

Or:

B = A(:,1:2:end).' % take every alternate column, then transpose

B = 3×3

1 2 3 4 5 6 7 8 9