MATLAB: Getting error with matrix operation

MATLABmatrix operations

Hi guys, i know this may be a fool question but anyway, i'm getting an error when i try to divide 2 matrix.

A= [1.5; -1]

B=[1 2; 3 4]

C=A./B

It says: Error using ./

Could anyone help me?

A\B

for i1 = 1:40
  s(i1) = (sum(A(i1,:).*B(:).')>=1); (<-- Corrected)
end

C=A.*B %what‘s wrong with this then?