Ventana software support forum

There isn't ... but I'll create something after the SD conference.

You can use the DSS trial key on the conference page if you'd like to experiment.

https://vensim.com/conference/

Well I must be dumb too, because I hadn't figured it out yet either!

I generally prefer the array version over the conveyor function. It's more flexible, because you can have multiple outflows (separate decay and uptake, for example), or nonlinear uptake.

I can't immediately think of a reason. My OS versions (13.1 and 10.something) bracket yours, and PLE works fine on both. The only thing I can think of is an expired evaluation license, but normally the application declines to start rather than freezing. Solution would be to reinstall using the educa...

In this case, I think you can forget about my rigid and elastic pipe variants, and just use the classic aging chain. There are two options for this: - If the loss function is a simple fractional rate (uptake, or radioactive decay), you can use the DELAY CONVEYOR with leakage. There's an example inst...

I think this thread viewtopic.php?t=8116 established that the error is caused by a missing : at the beginning of a macro.

Rather than defining these in the code, you probably want to define them in the preprocessor, via /D "DBLPREC". In Visual Studio this is in project properties>C/C++>Preprocessor.

The warning arises because the random draw differs between the initialization step and the first dynamic time step. However, since this is not an ACTIVE INITIAL variable, I don't think it should be reporting this. I think the trigger is, as Admin suggests, that there's too much nesting in: Ingresos ...

The precision of the dll has to match the precision of the Vensim version in use. All Vensim versions are now double precision.

There have been problems with cloud services locking files in the past, but I don't think OneDrive is likely to be the cause. I use it all the time without issues.

A question: is the intestine really like a plug flow reactor? As I understand it, those take off material only at the end. What little I know about the intestine suggests that there's a lot of material exchange along the way. Also, it's elastic and has active transport, right? Anyway, here are some...

Because the intestine might have complex dynamics for each segment, and it's central to the model, I'm going to suggest that you use arrays rather than delays. I'll post an example. A question: is the intestine really like a plug flow reactor? As I understand it, those take off material only at the ...

For customers, your INTEG expression is, IF THEN ELSE((Number of Customers-Previous Customer)>=0, Customer Retention-Customer Turnover-Previous Customer*Customer Units,0) since previous customer = number of customers, this simplifies to just Customer Retention-Customer Turnover-Previous Customer*Cus...

There are two nonstandard uses of stocks here: the "previous" inputs to customer satisfaction and number of customers. I think you should revert to standard notation, where the only things affecting the integrations in stocks are flows (plus the initial state). For customer satisfaction, y...

There are a couple other ways to solve this problem, closely related to VECTOR LOOKUP: https://metasd.com/2018/02/polynomials-interpolating-functions-decision-rules/ The reason you don't see this done much is that decision rules that are based on a vector of time points are not very general. They so...

Problem: When running the simulation, everything seems neat in "Year 0" based on the above values. However, when looking at "Year 1", it appears that Vensim carries over the initial value (here, "5000") to the next year and incorporates it into the result. I do not wan...

This looks like a discrete oscillation from having processes in the model that are faster than TIME STEP. A quick fix might simply be to make TIME STEP smaller. Also, check your units, if you haven't already. That may reveal a conceptual issue.

Maybe the VECTOR LOOKUP function? https://www.vensim.com/documentation/fn ... ookup.html

I don't think you want to comment them out. You just want to change the right hand side of the equation to a number or a variable input of your choosing. Or, get rid of the GAME() functions in Vensim before you translate the model.

The GAME function is for user input when running in gaming mode within Vensim. You don't need it for normal simulations. I'd simply edit the code by hand, either in Vensim or the translation.

Have you tried the SD conference archives?
https://metasd.com/2022/03/finding-sd-c ... ce-papers/

There isn't anything special about subranges that should cause an :NA: value to occur. However, if the dimensions of your imported dataset aren't completely populated, there will be :NA: values in the model that you can't see in the source data. For example, if you have sub : a,b,c and the data defi...

Sight unseen, the only obvious cause for this would be that the end time is set < FINAL TIME.

You might check the sample model in the Help system.

There are two ways to get an :NA: value: - the data series has a missing point, and the interpolation type is :RAW: - the data is completely absent for the variable/element Since the first is not the default, the problem likely arises from the second. If you have a data model doing preprocessing, yo...

PySD isn't our masterpiece - it was created by James Houghton at MIT. https://github.com/SDXorg/pysd PySD can translate many models, and there are many test cases demonstrating fidelity. I don't know for sure, but I think it's likely that there are some unsupported functions, or functions for which ...