Subject: World3 Equations

Posted by Jim Duggan on 10/5/2009
In Reply To:World3 Equations Posted by Niall Palfreyman on 10/5/2009

Message:

Hello Niall,

CLIP is a logical choice function, and is described in R.G. Coyle's book on SD (p 119)

For example
V = CLIP (A, B, C, D) will give

V = A, if C >= D and
V = B if C < D


Or in if-else form:

If(C >= D)
V = A;
Else
V = B;
End IF

It can be used when you want to switch policies in your model, and where this switch is a discrete change where, for example, one policy is activated and another is deactivated at the same time.

Best regards,
Jim.