Programming challenge:
U have n items in array x each of those items has an array of m items (m has the same length for all items).

You have a final output array y of size n * m. You want to put all the values of each of ur n items into this final output array. After performing some operation on each value.

In a loop iterating though x what is the corresponding index range within output array y?

This is why indexing starts at 0 not 1. Thx #matlab for the headache