MATLAB: How to extract data from a vector based on index

Question

I have an index and a vector I would like to have data from the vector which is not in the index!For example

A=[5 3 7 8 89 6]
index=[2 3 4 5]

Now I want to have B as my answer B=[5 6] Thanks!

Answer 1

   B = A(setdiff((1:length(A)).’,index(:)));

or if you're sure A and index are row vectors just

   B = A(setdiff(1:length(A),index));