# repelem substitute for older matlab version

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MiauMiau on 24 Jun 2017
Commented: KSSV on 24 Jun 2017
Hi,
I want to do the following (what usually repelem does, however an older version of Matlab does not seem to have it):
Given vector a = [3 45 6 ];
I would want for instance its first element to be repeated 2 times, the second 4 times, the third element once (just as an example). So we would end up with:
aNew = [3 3 4 45 45 45 6 6];
How can that be done in a systematic way without repelem?
Thanks
Stephen on 24 Jun 2017
You say that you want "the third element once", but it appears twice in your example. Which is correct? Where does that 4 come from?

Stephen on 24 Jun 2017
>> A = [3,45,6];
>> R = [2,4,1];
>> cell2mat(arrayfun(@(a,r)repmat(a,1,r),A,R,'uni',0))
ans =
3 3 45 45 45 45 6
KSSV on 24 Jun 2017
+1

KSSV on 24 Jun 2017
a = [3 45 6 ];
aNew = [3 3 45 45 45 45 6 6];
R = [2 4 3] ;
iwant = [] ;
for i = 1:length(R)
iwant = [iwant ones(1,R(i))*a(i)] ;
end
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KSSV on 24 Jun 2017
a = [3 45 6 ];
aNew = [3 3 45 45 45 45 6 6];
R = [2 4 3] ;
iwant = cell(1,length(R)) ;
for i = 1:length(R)
iwant{i} = ones(1,R(i))*a(i) ;
end
iwant = [iwant{:}]