R rep equivalent in octave

[drx]

Hi,
   I am looking for a command equivalent to rep in R. That function return
the items repeated a specified number of time. Here is a loop that would do
the job, but I am looking for an effective vectorial way to do it, or a
native command.

x=[ 1 2 3 4 ];
rep=[ 2 3 1 3 ];
z=[];
for i=1:length(x)
   z=[ z x(i)*ones(1,rep(i))];
end

I would like to be able to write something like
z=vectorialFunction(x,rep); 
instead of the loop.

Best regards,

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