Hi dear friends
I've recently joined the forum and I'll use your helpful comments for my system dynamics course.
At first I need a document in order to adopt the vensim's and stella's functions.
For instance, which function in vensim can performe as "graph" function in stella??
I need it for running this part of an example:
Death_Fraction = GRAPH(Density)
(0.00, 0.08), (10.0, 0.08), (20.0, 0.085), (30.0, 0.09), (40.0, 0.1), (50.0, 0.12), (60.0, 0.14), (70.0, 0.17),
(80.0, 0.2), (90.0, 0.24), (100, 0.3)
DOCUMENT: The death fraction is dependent on the density of the population. The higher the density,
the larger the fraction of the population that dies each year.
Thanks in advance
Stella graph function in Vensim?
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Re: Stella graph function in Vensim?
I'm unfamiliar with Stealla, but I think you need a lookup table.
See
http://www.vensim.com/documentation/ind ... ookups.htm
See
http://www.vensim.com/documentation/ind ... ookups.htm
Advice to posters seeking help (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Units are important!
http://www.bbc.co.uk/news/magazine-27509559
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Units are important!
http://www.bbc.co.uk/news/magazine-27509559
Re: Stella graph function in Vensim?
The simple way to do this is with function WITH LOOKUP, or an table LOOKUP(see the model attached) or if you need extrapolation with function LOOKUP EXTRAPOLATE.
- Attachments
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- Graph function.mdl
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