Conditional Statements Between Two Arrays

I am trying to compare each value between two large arrays then store true values as another array. What do I type?

[Ruger28]

What have you tried?

[Nathaniel Wolff]

If (x>y) %I don't know how to list the true statement as a new variable End

Answer 1

[Ruger28]

a = 1:100;
b = 1:2:100;
c = ismember(a,b); % index of values of array a inside of array b
d = a(c); % the values inside of a that are in b

[Nathaniel Wolff]

thank you