subtract each row from from matrix A from all rows matrix b

I have these 2 matrices. I am looking to subtract each row in B for all rows in A. The result put into a C.

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

the result should look like this: C(:,:,1)= [0 1 2;3 4 5;6 7 8] C(:,:,2)= [-2 -1 0;1 2 3;4 5 6]

Answer 1

[Star Strider]

I don’t understand how you got C(:,:,2). This otherwise seems to work:

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

C = cat(3,bsxfun(@minus, A, B(1,:)), bsxfun(@minus, A, B(2,:)))

C(:,:,1) =

       0     1     2
       3     4     5
       6     7     8

C(:,:,2) =

      -1     0     1
       2     3     4
       5     6     7

[Matthew]

That's great, thank you!! But it is not quite what i need. In reality, I have an A and B matrix that has 1000's of coordinates. I would like to do this calculation in a single line for all. Is that possible. My attempts to modify your line have been unsuccessful thus far. ANy thoughts?