MATLAB: How to set value in a matrix

Question

I have a double matrix 4×5 matrix

A=[11 12 13 14 15;

21 22 23 24 25;

31 32 33 34 35;

41 42 43 44 45],

B=[3 0 2 4 1]

B indicates to set all the rows of B[i] in A(from row 1 to that position) to 0.

C = [0 12 0 0 0;

0 22 0 0 25;

0 32 33 0 35;

41 42 43 0 45]

Thanks

Answer 1

for i = 1:numel(B)
    A(1:B(i),i) = 0; 
end