Thread Subject: saving initial values in simulink

Hello,

I am trying to calculate an error with simulink based on the following expression:

Error= (F(t)-F(0))-(V(t)-V(0))

where V is a vector on my workspace (first column is time and second is data) and F is an input value on simulink with a sample time at each time step. F(0) and V(0) are the initial values of the input F and vector V.
My question is: how can I save the values F(0) and V(0) at time t=0 and then use them at every other timestep?

thanks
Nuno

"Nuno Loureiro" wrote in message <ivf1oq$rap$1@newscl01ah.mathworks.com>...
> Hello,
>
> I am trying to calculate an error with simulink based on the following expression:
>
> Error= (F(t)-F(0))-(V(t)-V(0))
>
> where V is a vector on my workspace (first column is time and second is data) and F is an input value on simulink with a sample time at each time step. F(0) and V(0) are the initial values of the input F and vector V.
> My question is: how can I save the values F(0) and V(0) at time t=0 and then use them at every other timestep?
>
> thanks
> Nuno

Can anyone help me?