MATLAB: How to repeat an element with different frequency

Question

I have the following values: 

A = [1 2 3 4 5];

And want to use the following to denote frequency: 

B = [1 1 3 3 3];

Is there a way I can do this to yield the following: 

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

Answer 1

You can do the following using 'repelem'. See the following: 

A = [1 2 3 4 5];

B = [1 1 3 3 3];

C = repelem(A, B)

For more information, see the following documentation page: 

https://www.mathworks.com/help/matlab/ref/repelem.html#buqph3a