What do I have to do if I want to derivative and continue multiplying?

If I have two matrices

A = [1 2;3 4;5 6];
B = [7 8;9 10;11 12];

but my final equation is

D = transpose(A)*diff(B);

resulting in diff(B) has a dimension 2x2 but transpose(A) has a dimension 2x3

What's the best way to multiply them? (do not use .*)

Or should I use a gradient to maintain the dimensions of diff(A)?

Thank you for your helpful answers!!

Answer 1

[KSSV]

A = [1 2;3 4;5 6];
B = [7 8;9 10;11 12];
D = A'*gradient(B)

D = 2×2

9 9 12 12