I want to repeat an array by another array

Hi, all.

I have this problem that look rather simple. I have a vector say

A= [ 1,2,3,4,5]

and another vector

B= [2, 3,1,5,7,2]

I want to repeat A by the number of times in B to get a vector

C= [1,1, 2,2,2,3,4,4,4,4,4,4,4,5,5]

i.e. I repeated the first element in A by the number of first element in B and so on. I think there should be a simple syntax for it. Please help. Thank you.

Answer 1

[the cyclist]

A = [1,2,3,4,5];
B = [2,3,1,7,2]; % You had a mismatch in the length of B compared to A

C = repelem(A,B)

C = 1×15

1 1 2 2 2 3 4 4 4 4 4 4 4 5 5

[Joshua Folorunso]

You are right,

Thank you very much.