A simple question, looking for vectorized solution

[Siyi]

Hey all,

Suppose I have a vector like: [ 3 2 4 1 3 2...]

I want to obtain a new vector like:
[3 3 3 2 2 4 4 4 4 1 3 3 3 2 2...]

basically every value repeates it's own number of times.

is there a simple vectorized way to do this?

thanks!

[Bruno Luong]

One of the one-liner solutions:

v=[ 3 2 4 1 3 2 ]

cell2mat(arrayfun(@(x) x+zeros(1,x), v, 'uni', 0))

% Bruno

[Matt Fig]

I don't know about simple, but here is a vectorized solution.

A = [ 3 2 4 1 3 2]
A(A==0) = []; % Need to get rid of zeros in the general case.
cs = cumsum(A);
B = zeros(1,cs(end));
B([1 cs(1:end-1)+1]) = 1;
B = A(cumsum(B))

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[Siyi]

Bruno, Matt Thanks you guys!