Substract 2 arrays different size no For loop

Hello,

I would like to substract 2 matrix of different size ex: A=[1 2 3], B =[4 5] and I want each element of A to be substract by each element of B.

So that the result would be C= 'A-B'=[-3 -4 -2 - 3 -1 -2]

And I want to avoid using For loops, to get it as fast as possible (my A and B are already large).

I could use kron(A, ones(length(B),1)-kron(ones(length(A),1),B). But is there a faster/easier way ?

Thanks,

Bina

Answer 1

[David Hill]

C=A-B';
C=C(:)';

[Binabik]

true, then I will have to reshape to have only one 'column'...

I should have thought about it ! gg