How can I generate an array that satisfies a given number of repetitions and unique values

I have a repetition vector x = [3 2 1 2] and set of unique values y = [1 2 3 4]; How can I generate a vector z such that x = histc(z,y);

In this case z would be [1 1 1 2 2 3 4 4]

Thanks in advance!

KL

Answer 1

[Azzi Abdelmalek]

Edit

x = [3 2 1 2]
y = [1 2 3 4]
z=arrayfun(@(ii,jj) repmat(jj,1,ii),x,y,'un',0)

[Azzi Abdelmalek]

Look at Edit

[Azzi Abdelmalek]

The vector z is not unique

[Roger Stafford]

Yes, any permutation of the elements of z would also satisfy x = histc(z,y).

[Azzi Abdelmalek]

If you add to z values that are not in y, you will get the same result too

[Keven Laboy]

This works great. It is true that any permutation works, nevertheless, I only need the sorted z.

Thanks!

Answer 2

[Roger Stafford]

 t = accumarray(cumsum([1,x]),1);
 z = y(cumsum(t(1:end-1)));