MATLAB: How to use for loop

Question

if we have an array a= [1,2,3,1,2,3,4,1,2] and second array b=[1,2]

we want to know what is the number of occurrences that b are in a

which means the answer should be 3.

then how to write that using for loop?

Answer 1

Unless you absolutely must use a loop, use the strfind (link) function:

a = [1,2,3,1,2,3,4,1,2];
b = [1,2];
c = strfind(a,b);
Result = numel(c)

producing:

Result =
     3