How to insert value in a specific row and column of cell array ?

I have a 1 * 3 cell. The first two elements {1,1} and {1,2} contains random numbers from 1 to 500. So they are of the size : 500 * 1 each.

I want my {1, 3} element to have this value -> First to check if the {1,2} row contains the number 100, 200, 300, 400 and 500. If it does, I want to add value '1' in the corresponding row. If it does not have those numbers, I want to add value '0'. How do I achieve this ? How do I add value '1' at the exact same row corresponding to the those numbers (100, 200, 500 etc) ?

Answer 1

[KSSV]

A = [100 50 600 500 35 20 300 100 200 500 600] ;
idx = A==100|A==200|A==500

Answer 2

[madhan ravi]

idx=ismember(A,[100,200,500])