MATLAB Answers

Yufan Miao

How can I repeat each element of a vector different times and store them in a new vector

Asked by Yufan Miao
on 19 Feb 2013

Dear all,

I am a Matlab novice. I am sorry that my question may be silly.

Does anyone know that how I can repeat each element of a vector different times and then store them in a new vector?

Thank you in advance for the answers





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3 Answers

Answer by Andrei Bobrov
on 20 Feb 2013
Edited by Andrei Bobrov
on 21 Feb 2013

r = [1 3 3 4 0 5];
x = 1:6;
t = r > 0;
a = cumsum(r(t));
b = zeros(1,a(end));
b(a - r(t) + 1) = 1;
x1 = x(t);
out = x1(cumsum(b));

Answer by Jos (10584)
on 19 Feb 2013

Wayne pointed you to a run-length decoder/encoder.

Things become more simple if every element is to be repeated the same number of times:

% repeat all elements of A N times
A = [1 2 3]
N = 3 ; 
B1 = reshape(repmat(A(:).',N,1),1,[])
% or
nA = numel(A) ;
B2 = A(ceil((1:nA*N)/nA))


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