Delay Functions
Delay Functions
I am working with System Dynamics Modeling for Sustainability. However, I would like to know details of the mathematical formulation of the functions of Vensim Delay Fixed and Delay material. Because t is not clear in the manual Vensim and I need to know what is the programming of these functions, to build the differential equations systems and try to solve in the analytical way
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Re: Delay Functions
Maybe the following will help.
http://www.public.asu.edu/~kirkwood/sys ... o/ch-6.pdf
http://www.public.asu.edu/~kirkwood/sys ... o/ch-6.pdf
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http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Units are important!
http://www.bbc.co.uk/news/magazine-27509559
Re: Delay Functions
These are pure pipeline delays, so
y = DELAY FIXED( x, duration, x )
is essentially the same as
y = x(time-duration)
DELAY MATERIAL is the same, except for special treatment to conserve material if the duration increases.
y = DELAY FIXED( x, duration, x )
is essentially the same as
y = x(time-duration)
DELAY MATERIAL is the same, except for special treatment to conserve material if the duration increases.
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