Use one matrix to change values of another

I have two matrices, A and B which are something like:

A = [1; 2; 3; 4; 16; 17; 18; 19 ....] (not a repeating formula just numbers from 1 to 8976 with a lot missing in between)

B = [1 2 3 4 8 9 10 11; 1 2 5 6 7 8 16 17; 3 4 5 6 18 19 20 21]

I want to make it so that the numbers in B that are not in A are change to 0, so that B would look like

[1 2 3 4 0 0 0 0; 1 2 0 0 0 0 16 17; 3 4 0 0 18 19 0 0]

Answer 1

[Stephen23]

Method one: indexing:

>> X = ismember(B,A)
>> B(~X) = 0
B =
     1     2     3     4     0     0     0     0
     1     2     0     0     0     0    16    17
     3     4     0     0    18    19     0     0

Method two: multiplication:

>> X = ismember(B,A)
>> B = B.*X
B =
     1     2     3     4     0     0     0     0
     1     2     0     0     0     0    16    17
     3     4     0     0    18    19     0     0

[Michael King]

Thank you

Answer 2

[Guillaume]

Simply:

B(~ismember(B, A)) == 0

[Michael King]

Thank you