Ventana software support forum

Hi Using Vensim DSS 7.2 (Double precision) x32, I have been successfully exporting datasets as Excel files and CSV files but have just noticed a discrepancy in the number of decimal places recorded for the variables - Excel files have 15 while CSV only has 6. Is there a reason for this or am I missi...

Definitely a precision problem! I have been testing the full model with a trial version of Vensim DSS double-precision and I'm no longer getting a steady-state error at large volumes. That's not to say there are no physical system limitations lurking in my model but at least now they won't be masked...

Thanks for the responses. The trouble is that I'm not sure whether the problem is inherent to the system I'm trying to model (a tank reactor with multiple solutes and I've determined that the volume error manifests in the concentration but only at large volumes) or a precision problem. I would like ...

Hi Before I consider purchasing Vensim DSS, could I ask for your opinion on the following error in Vensim PLE Plus for Windows version 7.2 Single Precision (x32)? I have condensed my model down to a single level with inflow and outflow rates (attached). The order of the level is large (1e5) in compa...

No worries, sorted. It does work just by creating auxiliary variables but the effect wasn't noticeable until the tolerance was set much lower than 0.001 when it started causing errors.

Hi I am struggling to implement a change to the absolute and relative tolerances in Runge-Kutta integration. I have read the help files and they simply say: You can set ABSOLUTE TOLERANCE and RELATIVE TOLERANCE by writing equations for them inside of your model as in ABSOLUTE TOLERANCE=.001 ~Dmnl~Ma...