I have a vector with a lot of numbers, for example, A = [9,1,2,5,1,2,5,1,1,5,2,3,1,2,5,1,2,5,4,1,2,5,10]; and I want to remove all the values that are different from 1,2,5,9 or 10. In this case I would want to remove 3 and 4 so A would be
A = [9,1,2,5,1,2,5,1,1,5,2,1,2,5,1,2,5,1,2,5,10];
(I want to apply this to a vector with hundreds of values so I cannot remove that separately, I probably need do do a cycle but its not working)
How can I do this easily?