Ventana software support forum

i have a problem about look up function

i don't know how to use it ?

although i have read the vensim mannual

still didn't work..

hope someone can help me

thank you

Hi,

It might help if you post your model if its about how to do it in Vensim.

If your question pertains to the conceptual aspect of formulating lookup functions, there are a couple of resources that might help-

1. If you have access to John Sterman's book - check up chapter 14

2. Another excellent resource is Roadmaps. There are two good articles on formulating table functions - this is the link.

http://sysdyn.clexchange.org/sdep/Roadm ... D-4865.pdf
http://sysdyn.clexchange.org/sdep/Roadm ... 4653-2.pdf

Malli

Lookups are quite easy to use.

Here is a lookup definition (only two points, 0,10 and 1,100)
LOOKUP GRAPH ((0,10), (1,100))

To use,

Y = LOOKUP GRAPH(X)

for X=0, Y will be 10, for X=1, Y will be 100.

Hope this helps.

Tony.

hi,,

i hope customer is the lookup

how to use it