Why does the Simulink memory block delay the data by more than 1 iteration?

What I need to do is input the data from a previous iteration and the current iteration into a function and then do some vector analysis on these numbers. The setup is as follows: A vector A is x-y co-ordinates and is calculated by another function. This is fine. I need A(t) and A(t-1) to be inputted. But instead, with a memory block, or unit delay, I am getting A and A(t-10) (10 being a rough estimate, its around that, and its most certainly not the iteration just passed). Is there any way to make the memory block delay for just a single iteration. On R2011a, windows and mac if it matters.

Answer 1

[TAB]

For Unit Delay block ---> Set the sample time of block to -1 (Inherited).

For Memory block ---> Select the "Inherited sample time" checkbox.

[Rory]

Tried this, didnt help sadly.