Restricting output from a stock

[Peter]

I want to implement the behaviour on a flow draining a stock that allows either a standard amount or the amount actually in the preceding stock, whichever is the lower.

This must be a common issue under the generic heading of "Inventory can not go below zero". I'm sure there is a well documented solution I just can't seem to find it.

Regards

Peter

[Edited on 19-2-2004 by Peter]

[Owain]

Try the following:

actual outflow = min( desired outflow , stock / time step).

It should work, so long as there is just the one outflow from the stock.

Owain

[Peter]

Thanks