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

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Matthew
Matthew 2015-10-27
评论： Matthew 2015-10-27
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]

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回答（1 个）

Star Strider
Star Strider 2015-10-27
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
  1 个评论
Matthew
Matthew 2015-10-27
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?

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