Ventana software support forum

My guess is that there is some issue with XP. As far as I know we have only tested on Win7 and Win8/8.1.

See http://www.ventanasystems.co.uk/forum/v ... =48&t=6002

If you click on the slider arrow, you get a dialog that permits selecting a different element, but there's no way to show all at once. It's a feature we'd like too.

Sorry about the thread - it should be open now. We've never seen this issue, but will pursue it. What operating system version are you running?

We've discovered that the first download includes the incorrect build of the Help files. We'll post a new installer as soon as possible.

Earlier this week, we identified an issue with a recent Windows Update that degrades performance substantially - not debilitating, but enough to make the GUI feel sluggish. We haven't yet identified the specific culprit, but be aware that this could happen. (After a few experiences with bad updates,...

I think we deleted it in the v6 dialog upgrade, because it was seldom used. You can just type the keyword instead.

I think you'll find that 6.3d x64 solves file problems and works, though there will be an e release soon that addresses an error that only occurs on Linux. Unfortunately x64 conversion of c code is extremely complex, especially across platforms. Otherwise we'd have been done a lot sooner.

This forum is for support and discussion of the Ventity beta. Ventity is new simulation software for complex systems. Ventity has been through internal alpha testing, and will be released in a limited beta test, concurrent with the 2015 System Dynamics Conference. Very shortly, we'll be providing a ...

I can't really tell what's going on without informative variable names, but your "tcur increases" which is (tcur ij[i,J,ToD]/"tcur ij t-1"[i,J,ToD]) is strongly suggestive of a stock adjustment process. I think if you reformulate that as tcur = INTEG( change in tcur, initial tcur...

bed filling{beds/hour}=IF THEN ELSE (desired bed filling{beds}<=spare bed{beds}, desired bed filling{beds}/time to fill beds{hour},spare bed{beds}/time to fill beds{hour})

This seems OK - I suspect that the results would be equivalent.

The problem is not the function, it's a conceptual error in the equation (mixing stocks and flows). See http://www.ventanasystems.co.uk/forum/v ... 130#p21130

I haven't had a chance to look at the models, but note that there's a conceptual issue in the initial question, which would be revealed by considering units. Paraphrasing the original: spare beds{beds} = capacity{beds} - occupied beds{beds} + vacating beds{beds/hour} The problem is that the outflow ...

Using random multistart is generally a good way to test/improve the solution quality.

The upper limit depends on your model - nonlinearity of parameter interactions determines the number of iterations needed, and model size determines the speed of a given number of iterations. Getting solutions that are at the limits is usually an issue with the model's payoff surface, not the algori...

This is possible if you want to compare behavior over time input->output by using the custom graph to create a scatter plot. If you want to plot the relationship across multiple runs with different input values, you'd have to export the data, I think. You could automate that with the .dll, if you ha...

VECTOR ELM MAP is a more efficient way to implement this, though the difference will only matter in a large model.

A vdf is a dataset from a run or just raw data. You need a .vmf or .mdl file to see the model.

For ongoing free commercial use, and viewing features not supported in PLE, you can use the Model Reader (download same place as PLE).

Strange. GET XLS should require that the spreadsheet opens, and grab inputs "live". GET DIRECT should read from the file without having it open (and Excel will generally lock out other apps if it is open). Is this an xls or xlsx?

Is there a reason you can't just use the sums 1, 3, 6 ... directly? It's still not clear to me what we're trying to do here. Some context would help. In general, when something repeats like this, it makes sense to use a lookup, with the input given by MODULO(time,repeat period) or something like that.

So for the example given, would the output be 1, 3, 6, ... ?

You haven't specified whether the blanks are 0s, or what happens after 7.

I'd recommend posting a spreadsheet (or screenshot of one) showing exactly what you want.

Here's one option: http://www.ventanasystems.co.uk/forum/v ... f=2&t=5930

Your pic is ambiguous - if you indicate the desired output as well as input, it would help.

The general rule at work here is that Vensim has to know how the right side of the equation maps to the left, which usually includes the requirement that the number of elements on each side match: These are all OK: y = x y[range] = x[range] y = x[single element] y = SUM( x[range!] ) y[another range]...

When you refer to single elements, you don't need the SUM and !, so you could just write scots and welsh = inhabitants[wales] + inhabitants[scotland] Another possibility would be to define another subrange listing the two regions, and SUM that, like scotland and wales : scotland, wales scots and wel...

Also, it's often helpful to work in reverse, starting at the bottom of the hierarchy, like:

countries : (c1-c5)
regions : (r1-r4)

then

places : countries, regions