If there are 2 matrices a and b, what does a(b) do in matlab?

Question

If I have a matrix, say

a = [1 2 3;
     4 5 6]

and

b = [2 2 2;
     3 3 3]

when I do a(b) in matlab, I get the answer as

a(b) = [4 4 4;
        2 2 2]

what exactly is happening here ?

Answer 1

You're indexing a with each item in b . a(2) = 4 and a(3) = 2

so

c = [a(2) a(2) a(2); a(3) a(3) a(3)] 

is what you're seeing.