>> X = [4 5 1 7 3 9 2 4];
>> X(setxor(1:numel(X),[1,4,6]))
ans =
5 1 3 2 4
Or alternatively you could use create a logical array and use logical indexing. Even though it takes more lines it may be faster than the first solution:
>> Y = true(size(X));
>> Y([1,4,6]) = false;
>> X(Y)
ans =
5 1 3 2 4
