Ventana software support forum

Based on your replys and a short look on the world 3 model I conclude that the optimization in Vensim is not suitable for large models and for highly non-linear models. Would you agree on that? The next problem is that I don´t have the ressources to build a full economy, environment, etc., so I will...

I tried that as well, e.g. birth r = pop density * wheight pop density + gdp per head * wheight gdp but there´s still the problem of optimizing the wheight for all time steps because then the wheights are constant. Let´s assume optimization would give me: wheight pop density = 0.01 wheight gdp = 0.0...

Hello everybody, I´m writing a demographics model. I modelled one birth rate and for each age group one death rate. My problem is that using optimization in Vensim for forecasting, changes are made only to constants (the death rates and the birth rate are constants). Is there a possibility that i ca...

Thanks a lot.

By the time I installed Vensim I had no idea what the other installation modes were, so I´m going to check this

Hello, I have a small problem regarding the "internal rounding" of Vensim (I´m using Vensim DDS32 Version 5.1a). It seems like Vensim is rounding up to the next integer or eighth before summing up values and after divisions. Example: Summing up 87096,97656 10935,94238 8006,67334 6118,92041...