How to get data from 2D array and put into 1D array

Question

I have a 2D array and I want to create a 1D by MATLAB, satisfying the requirement that each element of the 1D output was created by the value of a given index into the 2D array.

Answer 1

I am not sure I understand your question but i think you want to apply functions on a 2-by-n matrix

Try

for pos=1:size(a,2)
  b(pos) = f(a(:,pos));
end