Extract elements of a list using their indices

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Izem 2020-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/585398-extract-elements-of-a-list-using-their-indices

评论： Star Strider 2020-8-27

I have a list B which contains the indices of a classified elements and a bigger list A and I want to extract the elements of A using the indices in the list A.

Is there a simple way to do it ?

NB :

I used this line to get theses indices :

[sharedvals,idx] = intersect(A,B,'stable');

Thank you in advance for your answers.

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Star Strider 2020-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/585398-extract-elements-of-a-list-using-their-indices#answer_485918

The ‘sharedvals’ result should be what you want, however it returns the identified values without repitition. If you want all of them (asuming there are more than one of some of them), the ismember function might be more appropriate.

Note that more information would be helpful, including the reason you asked this, considering that intersect appears to do what you want.