How to create a new matrix from another two matrices

Hi there, i have 2 matrices of image, both have the same number of pixels A(160,700) and B(160,700). So what I want to do is to create a new matrix (C), which uses the same value in B providing the condition in A is met, but replace it to 0 if its not. In A, i have values from 0 to 1. If the value in A is 0.1<A<0.3, so the C uses the same values as in B, otherwise it is 0.

i tried to use this code below, but it does not work

    C=zeros(size(A));
    for ii = 1:length(A)
    if A(ii)<0.1 & A(ii)>0.3
        C(ii)=0;
    else C(ii)=B(ii)  
    end

    end

Thanks in advance for your help!

Answer 1

[the cyclist]

C=zeros(size(A));
indexToB = A>0.1 & A<0.3
C(indexToB) = B(indexToB)