Ventana software support forum

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 ...

The Vensim DSS publication to webassembly doesn't require any software after the initial publication. Your application runs in the client browser as pure html/javascript/wasm.

You could use SAMPLE IF TRUE to freeze the value at each interval.

The mapping lets you write stuff like:

sales[fruit] = preference[fruitType]*supply[fruit]

Your second equation has 6 elements on the left, and 2 instances of 3 elements on the right, so it can't work. You could do something like the following: oranges : mandarins, satsumas, easy peelers apples : granny smith, red delicious, pink lady fruit : oranges, apples ~ build the master list hierar...

Nice interpretation!

A variable name can be pretty much anything you want - they can be long, but there's nothing to stop you from using x, y, p1, p2, etc.

This looks like an interesting problem, but I think we'd need a little more info about the stock/flow structure to solve it.