Ventana software support forum

There isn't any document, or interoperability, yet. We will create a translator for Vensim models to Ventity, most likely via XMILE. Simple models and components should translate ~100%. We don't expect full two-way translation of models to be practical. Coming from Vensim, it doesn't make sense to m...

I just downloaded, installed and ran PLE 5.11 on a Win8.1 x64 machine, and it worked fine. Perhaps your downloaded file really is corrupted. Try the download again?

"Arcane" may not be the best word. However, in my experience, there are often a few points in a model, usually where the dimensionality is changing, that do require very complex and opaque subscripting. Now that I've been using Ventity for a little while, I'm also finding it annoying to ha...

No harm done; seems like a worthy experiment.

Hotel construction 2.mdl Here are two general strategies - changes highlighted. Option A is to charge the construction with the flow when it occurs. Option B is to detect changes in the stock, using DELAY FIXED to keep track of the previous value, and charge accordingly. I think A is the preferred ...

Yes, I think a little more information about the problem statement would help here.

Filtering the 0s would be more complicated, but I think it's doable. I can't cook up an answer on the fly though. Here's a stab at the simple way - not sure it's really responsive to your situation, but code is the best way to find out: objects : (o1-o60)~~| objects1 : (o1-o20) -> objects2, objects3...

OK, I think I get it. It seems like an inevitable consequence is that if any subarea has >20 objects, you have a problem fitting them all in with the offsets? With that restriction, I think there's a simple solution. Do you need to pack the vector to get rid of 0s, i.e. 3,17,21,0,19 -> 3,17,21,19 ?

Also ... not sure I follow the problem statement. If each of 3 subareas contains up to 60 objects, wouldn't you need a vector of up to 180 elements to store the consolidated positions?

How many objects and areas will there be eventually? It might be easier to just use brute force and track every object/area location, rather than trying to reuse IDs.

That's odd ... Delete -> Remove from this view but do not change model structure is what you should be using. I do it all the time. Can you post/send a model saved before/after such an operation? What OS are you on?

Great. I'm sure we'll have more teething problems, but it's good to have the basics working!

I think the problem is that your adoption from advertising is too high. You have: adoption from advertising 0 = "effectiveness of advertising & promotion"*potential users 0*marketing investment So "effectiveness of advertising & promotion"*marketing investment is effectiv...

There's a new build 457 that fixes the help system issues, plus some bug fixes and feature upgrades. Get it at http://vensim.com/ventity.html

We found it on Windows 8.1. It went away after I rolled back updates to about June 15. The problem is, the update process queues changes that don't take effect until a reboot, which makes it very tough to determine which KB item is the culprit. No one has seen the problem on Win7, and no one has tri...

It seems like there ought to be an analytic solution, but I don't know it off the top of my head. You can separate the processing of the FIND ZERO subscripts by writing the equation to solve one element at a time (as in IRRGCC), but that would be a pain. A better approach, I think, is to detect the ...

MODEL 1 b.mdl model 2 b.mdl In model 2, you're missing the outflow of process losses, so the losses "pile up" in the stock of WIP. I've modified to rectify that. In both models, there's an unaddressed question of whether managers know about the losses and adjust production to offset them....

Is there a reason for not using the INTERNAL RATE OF RETURN function here?

However, there is no way to selectively turn off a set of subscripts at runtime without changing model structure. Why do you need this? Maybe there's another way.

We haven't posted it widely yet, but I'll PM it to you. You should have received a link in an email from ventity.biz - I'll check to be sure you're on the list.

We'll fix the paths and release a new build as soon as everyone's back from the conference.

FIND ZERO dispatch.mdl The above setup might work. It needs demand/supply curves and parameters, but hopefully you can guess the intent from the units & names. The purpose of the "unserved" item is to permit convergence even in extreme conditions (low supply and inelastic high demand)...

I think the issue is that Difference Quantity isn't a vector. The first four arguments all need to have the same dimension. It should be possible to reformulate this problem to work, perhaps by computing a single shadow price and deriving exports from that. I'll have to think about it.

Good that it works. We'll get a new build with the help link issue resolved as soon as we're back from the SD conference. I'll email an announcement to users and post here.

I'm happy to look at it after the SD conference.