get elements at x from array A without loop

so, i have an array A=(1,2,3,4,5,6,7,8,9) and another array containing indexes B=(1,1,3,6,7,5,4). How to get a third one based on B such that C=[A(1),A(1),A(3),A(6),A(7),A(5),A(4)]?

I know how to do this by looping through b with i=1:length(B) and taking C(i)=A(B(i)) but would prefer to do this without any loop due to my real data being considerably larger than this example.

I'm new to matlab, any help is highly appreciated. thanks!

Answer 1

[Fangjun Jiang]

A=10:10:90;
B=[1,1,3,6,7,5,4];
C=A(B)

C = 1×7

10 10 30 60 70 50 40

[Daniel Neubauer]

thanks a lot!