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Combining two arrays by pointwise repeating the elements of A(i), B(i) times.

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Michel 2014-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/158019-combining-two-arrays-by-pointwise-repeating-the-elements-of-a-i-b-i-times

编辑： Matt J 2014-10-9

I want to combine two vectors (A and B) with the same length into a new vector (C) with length sum of B.

e.g.

A = [1,2,3,4]; B = [2,1,2,3];

C = [1,1,2,3,3,4,4,4]

Thus repeating the elements of A, B times.

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回答（2 个）

Pierre Benoit 2014-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/158019-combining-two-arrays-by-pointwise-repeating-the-elements-of-a-i-b-i-times#answer_154543

You can use this function from the FEX : http://www.mathworks.com/matlabcentral/fileexchange/6436-rude-a-pedestrian-run-length-decoder-encoder/content/rude.m

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Matt J 2014-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/158019-combining-two-arrays-by-pointwise-repeating-the-elements-of-a-i-b-i-times#answer_154548

编辑：Matt J 2014-10-9

在 MATLAB Online 中打开

   idx(cumsum([1,B]))=ones(length(A)+1,1);
   C=A(cumsum(idx(1:end-1)))

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