执行'@minus'时出现bsxfun错误

Question

I have two matrices to be subtracted. Let's see the code below.

A=rand(5472,1);
B=rand(1,3);

C= bsxfun(@minus, A, B(:))

I get the error saying that

Non-singleton dimensions of the two input arrays must match each other

Any idea why this error? Thanks!

Answer 1

you are trying to apply bsxfun on two column vectors, while you should apply it on one row and one column vector.

bsxfun inputs should have different singelton dimensions ( size(arr,dim) == 1 ). in your example size(A) = [5472,1] and size(B) = [1,3] which is appropriate input ( A 's singelton dimension is 2 and B 's singelton dimension is 1), but when you do B(:) - B 's singelton dimension becomes 2, like A 's, which throws an error.

do:

A=rand(5472,1);
B=rand(1,3);

C= bsxfun(@minus, A, B)