how can I multiply two different size matrices in iterations like 7x7 and 4x4?

i added the png but both matrices will be random matrix not a unit matrix

[Torsten]

Hint:

A 4x4 matrix of M1, starting at position (i,j), can be extracted as

M_4by4 = M1(i:i+3,j:j+3)

for

1<=i<=4, 1<=j<=4

Answer 1

[DGM]

See these answers to a similar question:

https://www.mathworks.com/matlabcentral/answers/1867698-shift-a-square-matrix-along-a-bigger-square-matrix-by-one#answer_1116723

https://www.mathworks.com/matlabcentral/answers/1867778-convolution-without-convolution-function#answer_1116563