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Extract elements of a list using their indices

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Izem on 27 Aug 2020
Commented: Star Strider on 27 Aug 2020
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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Accepted Answer

Star Strider
Star Strider on 27 Aug 2020
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.


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Star Strider
Star Strider on 27 Aug 2020
My pleasure!
You would have to use the appropriate function (intersect or similar) on whatever combination of lists you want to use. One set of indices would not work for all lists.

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