How to get back the elements of array which are not defined in an index array?

Question

For example, I have following array in MATLAB:

a = 11:20 ;

and I want to to extract the elements from a which are not defined among the below index elements:

b = [2,3,5];

If I execute the following line of get:

a(b)

ans =

    12    13    15

I am looking for a method which is just opposite of above and without introducing loop to get the elements from a and index of those elements is not present in index array b .

Answer 1

setdiff是您要寻找的功能。

a(setdiff(1:end,b))

Answer 2

An alternative approach:

>> a = 11:20;
>> b = [2,3,5];
>> c = a;
>> c(b) = []
c =
   11   14   16   17   18   19   20

c(b)=[] deletes from c the elements indexed by b .