Duplicate elements in array n times, where n is an array itself

Hi everyone,

I have two arrays of the same length and would like to duplicate each element in the first array n times, where n is the value in the second array. Example:

A = [1 2 3]
B = [2 3 1]

then C shall be = [1 1 2 2 2 3]

How can this be done? I checked the forum and tried to play around with repmat but could not get it to work.

Any help is greatly appreciated! Thanks!

[Azzi Abdelmalek]

You mean how to duplicate (not to multiply)

Answer 1

[Stephen23]

If you have MATLAB 2015a or more recent, then use repelem:

 >> repelem([1 2 3],[2 3 1])
 ans =
   1   1   2   2   2   3

[Oliver]

I do and thanks that works like a charm!

Answer 2

[Azzi Abdelmalek]

A = [1 2 3]
B = [2 3 1]
C=cell2mat(arrayfun(@(x,y) repmat(x,1,y),A,B,'un',0))