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Replace elements of array with elements of another array without for loop

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Harshil Deepak Prajapati 2018-3-28

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https://ww2.mathworks.cn/matlabcentral/answers/391218-replace-elements-of-array-with-elements-of-another-array-without-for-loop

评论： Guillaume 2018-3-28

采纳的回答： Birdman

A = [1 1 1 3 3 3 4 8 8 10 10 15 15]

B = unique(A)

B = [1 3 4 8 10 15]

I want the output to be [1 1 1 2 2 2 3 4 4 5 5 6 6]

I tried for loop :

for i=1:length(A)

A(A == B(i)) = i;

end

How can I do it without for loop?

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Birdman 2018-3-28

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编辑：Birdman 2018-3-28

在 MATLAB Online 中打开

[B,ia,ic] = unique(A)

Third output argument ic will give you what you want.

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Guillaume 2018-3-28

在 MATLAB Online 中打开

So really in this case, since the first two outputs are not needed:

[~, ~, B] = unique(A);

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