Hi Lili,
If I understand correctly, you fill the matrix c with data inside the 'for' loop and now you want to extract/copy the third column of c into another variable.
Colon operator can be used for this purpose. If A is a given matrix, A(:,n) is the nth column of matrix A.
In your case, the third column can be stored inside variable 'var' ( 271x1 double vector ) on completion of the 'for' loop
var = c(:,3)
