Extract elements of a list using their indices

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.

Answer 1

[Star Strider]

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.

[Izem]

Thank you for your answer. you are right I can have those values easily in 'sharedvals' but in my case I want to extract also other values in other lists based on their indices (to make some plots) so I need something equivalent to :

result = X(indice) % when we have only one indice

But in my case indice is a list so how can I have a list of the values in my list A corresponding to the indices in my list B ?

[Star Strider]

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.

[Izem]

Okay thank you !

[Star Strider]

My pleasure!