MATLAB: Creating a vector from a bin count

Question

Hello,

I have a matrix I got from another source that look like:

[0 5; 1 2; 2 1]

I wish to get a vector like [0 0 0 0 0 1 1 2] .

Thanks

EC

Answer 1

R2015a or later:

>> M = [0 5; 1 2; 2 1];
>> repelem(M(:,1),M(:,2)).'
ans =
     0     0     0     0     0     1     1     2

R2014b or earlier:

>> C = arrayfun(@(x,n)repmat(x,1,n),M(:,1),M(:,2),'uni',0);
>> [C{:}]
ans =
     0     0     0     0     0     1     1     2