Ventana software support forum

Thanks for your feedback

Forgot about the /20

if you see my attached model of the comparison between the TREND function and the TREND flow diagram (learnt from John Sterman textbook), why i cannot get the same result , I have no idea what went wrong.

thanks again

Sorry, my question may be not clear enough I find that if I use the bulidt-in function TREND (in the attached file , I name it TRND), I cannot get the correct and same results as what I can get from the full stock-and-flow struture of the TREND functions. Following the default setting TREND (input, ...

Hi Tom Thanks I finally try and figure our why it does not work with the TREND functions. I finally realized how to replicate the finished goods and parts inventory behaviour by having to divide the initial customer order rate (COGR) by a figure like 60 which would make the invenotry like most what ...

Dear again, I am working hard to rebuild the model of James Lyneis Corporate Planning and Policy Design, Chapter 5 "Using Forecast in Decision Making" (DYNAMO) When I use the TREND functions in vensim, I cannot figure out which variable should be used for the Initial production rate (PR) g...

Hi, I try to use vensim to re-build the model of Future Electronics which was in dynamo under the textbook by Michael goodman Study notes in SD. But, I face several problems. a. 2 units errors discovered - I cannot figure out what is wrong as I follow the unit mentioned in the text. b. the effective...

May I know how to formluate the rate equarion with VENSIM built-in functions for this DYNAMO exponential function EXP ? e.g. Birth growth at a rate of 3% since year 2015 till now for initial population 1,000 people (GROWTHN=1000) in DYNAMO , it would be like GROWTH.KL = GROWTHN * EXP(0.03(TIME.K, 20...

Hi

I get 2 MDL files from SDR supplementary (see attached) that I cannot open it.

It shows the text view, and I can't switch to the sketch view as it promts syntax error, I appreicate someone who know how to solve this and advise?

Thanks a lot.