Array Won't Preserve Values?

I am trying to store values into a dynamic array. The size of the array will vary each time, so I need the range to be dynamic. Most importantly, I need all values to be retained in the array. Currently, a value will be stored, but once the next round of the for loop is initiated, the array changes to "<subscript out of range>" and stays that way until the it is replaced by the next value. So, there isn't an accumualtion in the array--it goes one value, to out of range, to one value, etc.