How to repeat rows of matrix?
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Hi,
I have a matrix and a vector indicating how many times the corresponding lines in the matrix should appear. I'd like to turn this into a single matrix.
For example:
M= 1 2 V=1
2 3 2
4 3 1
2 4 2
should become
M =1 2
2 3
2 3
4 3
2 4
2 4
Does anyone have advice on how to accomplish this? Many thanks.
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Réponse acceptée
Matt Kindig
le 13 Juin 2013
Modifié(e) : Matt Kindig
le 13 Juin 2013
One way:
f = @(k) repmat(M(k,:), round(V(k)), 1);
MM = cell2mat(arrayfun(f, (1:length(V))', 'UniformOutput', false));
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Plus de réponses (4)
Roger Stafford
le 13 Juin 2013
Here's yet another possibility:
p = accumarray(cumsum([1;v]),1);
M = M(cumsum(p(1:end-1)),:);
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Azzi Abdelmalek
le 13 Juin 2013
out=cell2mat(arrayfun(@(x) repmat(M(x,:),V(x),1),[1:numel(V)]','un',0))
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