Ventana software support forum

I understand it now. Thanks a lot for the clarification!

This is a Lotka-Volterra model with an over-dispersed Poisson as payoff (I've shared a version of this model earlier). What does Vensim do when the event data is non-integer? I get these warnings at the very end of the estimation log: Thank you!

When I run optimization on a model iteratively on different datasets using command script (e.g., 10 rounds of Powell/MCMC on 10 different datasets back to back without killing the terminal session), I get this message in the terminal from time to time: Command '['C:\\Program Files\\Vensim\\vendss64M...

I meant setting these two options highlighted. What I'm currently doing is to save the model with these settings, but when I run the script I shared I iterate over different Data.vdfx. I was just wondering if I'm doing it correctly or if there's a better way to handle this. Screenshot 2025-06-19 at ...

When I run Kalman MCMC using MCINITMETHOD=3 (hybrid) on top of Powell.out, it gives Max PSRF = 0, which I found it odd. What's the meaning of it?

What command should I use to make sure that Kalman.prm file is used when running a Kalman optimization? These are the commands I have that I run using terminal without opening Vensim: SPECIAL>NOINTERACTION SPECIAL>LOADMODEL|model.mdl SIMULATE>DATA|Data.vdfx SIMULATE>RUNNAME|Kalman_Powell SIMULATE>OP...

Thank you very much, Tom! I didn't have the payoff report on, and I accidentally found out about the cin fp error files. But I didn't get any error when I used the .cin input to simply run the model, which was surprising. I can run the calibration with the payoff report on to see what else is being ...

When I estimate the parameters of a model using over-dispersed Poisson (attached), the optimizer generates 'fp_err_ctx' .cin files. But when I run the model with these inputs, I don't get any fp errors. I might be missing something, so could you please help me understand what's happening? Thank you!...

Thanks a lot, Tom. Yes, I'm doing sensitivity after MCMC, and all I had to do was to include NOISE SEED as a variable in the model and set MY_SEED = 0, which goes into the Random functions. Such a nice feature! Thanks a lot!

Is it possible to manually add this option in the .vsc file as a text? (to avoid the hassle when using cmd/dll)

Hi Tom, thank you for your quick response. I'll email you now.

I can see the .out files being generated when running a cmd file manually. But when I use the same command "MENU>RUN_OPTIMIZE|o" combined with venpy/dll on windows, it generates the .vdfx files but not the .out ones. Is there a way to save the optimized parameters? On a related note, I wan...

I have another question. Is it possible to tell 'SIMULATE>ADDCIN' command to read the .out file from a subdirectory rather than the parent directory where the model and .cmd files are saved? If so, could you please provide an example? Thanks again!

I could run it. Thank you so much!!

Hi. What is the equivalent of this action in the command script? FYI, I want to run MCMC with the values obtained from Powell. Thanks so much in advance!

Thank you, Tom! I think I got confused thinking all chains start from the same point and MCINIT controls the level of "added noise" for sampling. But noise is clearly controlled by other parameters, so not sure why I got confused. Thanks a lot for the clarification!

I couldn't find the explicit definition in the tutorial, so I'm posting my question here: When running a standalone MCMC with multiple chains per each parameter, do all chains start from the same starting point?

Such a great graphical visualization for simultaneous equations! Very cool feature!

Yes, they also show up in the equations.

I'm not sure how it would look like on other machines, but on macOS, you can use emojis instead of regular characters.

Thank you so much! 10.3.0 works perfectly now! Lot's of great features!

And it now appears in the default resolution. I guess for the very first time it was outside of the display area (all displays). it's all set now. Thank you!

When the equation editor was open (and it was not showing up), I changed the resolution and it suddenly appeared!

Of course, I had done that. I only had two monitors connected and was suspecting the extra displays are acting up. They did not. Just a FYI, I have a 14-inch Mac. I can restart it to see what happens. Is it possible that some interface settings from the previous version in the shared folder are inte...

Equation editor seems to get activated but nothing shows up