How to check if any variable in one array is in another

Question

I\'m developing a program with MatLab that calculates powers of numbers, adds them together, and then sees if any of the first set of numbers (numbers to powers) equals any of t

Answer 1

Example vectors:

>> m = [1 3 5 9];
n = [5 2 1 4 8];

1. To check if each element of vector m is in n, use ismember:

   >>ismember(m,n)
   ans =
        1     0     1     0
   

2. To get the values, not the indices: use logical indexing on m:

   >> m(ismember(m,n))
   ans =
        1     5
   

   or directly use intersect:

   >> intersect(m,n)
   ans = 
        1     5