Ventana software support forum

I think you'll find some error logs in
C:\Users\yourname\AppData\Roaming\Vensim (shorthand %AppData%\Vensim )

You've found a glitch that will be fixed in the upcoming release. You can't literally write, Price[sector,sector] = blabla but you can define subscript equivalents, fromSector <-> sector toSector <-> sector and then write, Price[ fromSector, toSector ] = blabla However, the equation editor glitch cu...

IF THEN ELSE(fluid=1, fluid1 lookup(input), fluid2 lookup(input))

X IF MISSING is also more convenient if you have multiple data inputs in the equation.

The other option is to package the model as a vpmx along with the compiled .dll.

I don't recall if xlsx is supported, but CSV and tab-delimited are. Model>Export Dataset...

CSV opens into Excel by default.

I think you are certainly safe to extend and adapt World3 however you wish. Obviously it would be a courtesy to cite the original authors, whether or not it's strictly a legal obligation - which I'm sure you would. The Vensim license only applies to Vensim and ancillary components - anything you cre...

It still computes the payoff; fortunately that works because it uses the LogGamma function as a continuous generalization of factorial. Should be harmless, though perhaps we should suppress excessive warnings.

You're right ... as of at least 10.1.5 (Win) it was possible. So, regression ...

I'm not sure it was possible, but obviously it should be. In the old gui, it was possible to right-click (ctl-click) the table tool to change the default width. Also, the runname should be in its own column. Ticketing for improvement ...

These _should_ replicate an fp error. We'll take a look at the model. You might try turning on the payoff report, if it isn't already on, to reproduce.

Not if you're using the File method. But every time you run an mcmc, it now generates a vsc that runs the sample with that box checked.

For other methods (multivariate, latin hypercube) you can add NOISE SEED=VECTOR(...) to the list as an alternative.

The output should be the same. We'll have to take a look. Do you have a test case?

One way to assess what's going on is to look at the _distrib file that gets generated. If you filter out the final sample and plot a parameter against iteration, you can see how the distribution evolves.

No. There are three initialization methods: overdisperse, underdisperse, and hybrid (set by the MCINIT parameter). - over draws in the same way Powell multistart works, from a very broad powerlaw distribution (or uniform if both bounds are set); in the future, I'd like to modify this to draw from yo...

I'm puzzled by your statement that "defining simultaneous flows in two directions unintentionally inflates total demand. For example, demand moves from Brand B to Brand A, and then flows back to Brand B." In your example, demand is conserved. If demand shifts from A to B, the demand for B ...

Here's a possible workaround: Edit the equation for the destination variable. Add the source variable to the expression. When you exit, accept the request to add the source connection to the diagram. At this point, you'll have a straight arrow from source->destination. Navigate to the midpoint and c...

I think it's possible - use the flow tool to click on the valve, then click on the target (whitespace for a cloud, or another stock). You may have an unwanted arrowhead at this point, which you can turn off with a right-click.

Maybe this?
glucose in = infusion + endogenous
endogenous = STEP( endogenous rate, endogenous start time )
endogenous start time = 2
infusion = STEP( infusion rate, endogenous start time + infusion delay )
infusion delay = 4

There are also some video courses here https://vensim.com/video/

Great. Another place this comes up a lot is in tracking bonds and mortgages. There's usually a mix of terms, which makes the simpler first-order version attractive for strategic models, as in your case.

Something like this: In queuing theory there's also the concept of "balking" where arrivals decline to joint the queue, because they immediately perceive that the line is too long.

I think the best option is to disaggregate the capacity stock into incentivized and older components. For example: capacity credit stock disagg.png There are two versions here. The top copy uses a standard first-order outflow on the stock of new incentive-eligible capacity. That may be appropriate f...

Reposting a question from metasd.com: How do I add a variable that tracks the “age of a stock”? I am looking at an energy system dynamics model where tax incentives are offered for the first 10 years of an installed capacity operation. I have stock representing the installed capacity but need to set...

On the Advanced tab of the sens2all setup dialog, you can specify a savelist that excludes nuisance parameters: