If you open them in the same application instance, this works. (If you open the files by double-clicking from the finder/explorer, you have two application instances, and it won't work.)
In pro/DSS, general settings, you can enable opening multiple models simultaneously.
Search found 3816 matches
- Mon Jan 29, 2024 6:30 pm
- Forum: Vensim
- Topic: Copy & Paste between models
- Replies: 4
- Views: 2652
- Thu Jan 25, 2024 5:35 pm
- Forum: Vensim
- Topic: Max file size
- Replies: 5
- Views: 1590
Re: Max file size
I think the 3221226505 return code may be a variable type mismatch - this has been reported in other contexts.
- Sun Jan 14, 2024 11:19 pm
- Forum: Vensim
- Topic: Finding MAX of simulation variable
- Replies: 2
- Views: 1726
Re: Finding MAX of simulation variable
If you can make the calculation at FINAL TIME, you can use SAMPLE IF TRUE to hold the max value over the simulation - there's an example in the help system.
- Wed Jan 10, 2024 5:44 pm
- Forum: Vensim
- Topic: Get data xls with multiple subscripts
- Replies: 4
- Views: 7944
Re: Get data xls with multiple subscripts
In a case like this, importing the data to vdf would be less error-prone.
- Wed Jan 10, 2024 5:42 pm
- Forum: Vensim
- Topic: Get data xls with multiple subscripts
- Replies: 4
- Views: 7944
Re: Get data xls with multiple subscripts
The GET DATA calls are basically 1-dimensional because the spreadsheet is 2D, and one is taken by time.
One possible way to semi-automate a GET call with more dimensions is to put the sheet names or first-cell references in a string variable with the appropriate subscripting.
One possible way to semi-automate a GET call with more dimensions is to put the sheet names or first-cell references in a string variable with the appropriate subscripting.
- Sat Jan 06, 2024 5:33 pm
- Forum: Vensim
- Topic: Vensim not correctly calculating stock from flows
- Replies: 4
- Views: 11755
Re: Vensim not correctly calculating stock from flows
Right. Personally I find it hard to remember the beginning/ending balance sequencing. It would be nice if we could update the table tool to make it easy to toggle display of stocks as start/end of period, though that might be tricky for some variables using functions like SAMPLE IF TRUE. It would al...
- Sat Jan 06, 2024 3:23 pm
- Forum: Vensim
- Topic: Vensim not correctly calculating stock from flows
- Replies: 4
- Views: 11755
Re: Vensim not correctly calculating stock from flows
I think that the computation is actually correct. The Euler update in your spreadsheet is: stock(t + dt) = stock(t) + flows This is fine if the TIME STEP (dt) = 1, but in this model it's 0.25. The correct Euler update is: stock(t + dt) = stock(t) + flows*dt In this case, the value 1618 in cell F37 i...
- Tue Jan 02, 2024 10:46 pm
- Forum: Vensim
- Topic: Solving for implicit functions before starting time
- Replies: 7
- Views: 16480
Re: Solving for implicit functions before starting time
I agree. The drawback of a lookup is that it might not be totally general (i.e. you'd have to recompute the values if some assumption changed). My guess is that the speed penalty for FIND ZERO is small. Unfortunately, you can't wrap FIND ZERO in an INITIAL statement, but you could set the error vect...
- Fri Dec 29, 2023 4:02 pm
- Forum: Vensim
- Topic: Solving for implicit functions before starting time
- Replies: 7
- Views: 16480
Re: Solving for implicit functions before starting time
Another option would be to put a table of solutions (Moody diagram) into a lookup or fitted function.
- Fri Dec 22, 2023 3:14 pm
- Forum: Vensim
- Topic: Can't view model as sketch
- Replies: 13
- Views: 17008
Re: Can't view model as sketch
This means there are syntax errors in the equations. Use Check Model <ctl><T> to see the error window.
- Fri Dec 22, 2023 3:13 pm
- Forum: Vensim
- Topic: download stel2ven.zip and/or stel2ven.exe
- Replies: 2
- Views: 5979
Re: download stel2ven.zip and/or stel2ven.exe
Newer Stella models are in XMILE, which you can import via the File menu.
- Fri Dec 22, 2023 3:12 pm
- Forum: Vensim
- Topic: Erased variables
- Replies: 2
- Views: 3903
Re: Erased variables
Whether variables remain in the model depends on user choice - when you delete a variable with the delete key, a dialog asks whether to remove them from the model or only the current view. You can find these variables by opening the Control Panel > Variables tab, and selecting the "orphans"...
- Sat Dec 16, 2023 10:52 pm
- Forum: Ventity
- Topic: Very strange behavior when I edit auxiliary names
- Replies: 1
- Views: 10884
Re: Very strange behavior when I edit auxiliary names
I can replicate this. Ticketed for the devs to take a look.
- Sat Dec 16, 2023 10:47 pm
- Forum: Ventity
- Topic: Ventity download
- Replies: 1
- Views: 7430
Re: Ventity download
It's working right now. There was an intermittent issue that seems to be resolved with our last web site update. Sorry for the issue.
- Fri Dec 15, 2023 4:58 pm
- Forum: Vensim
- Topic: Sub-Subscripts?
- Replies: 3
- Views: 4414
Re: Sub-Subscripts?
Notice here that the COUNTRIES range is built up hierarchically by first defining euro and non-euro subranges. That's not necessary however - you can mix & match ranges and elements. City : Boston, Las Vegas, Denver, San Diego, Seattle, New York East Coast : Boston, New York West Coast : San Die...
- Tue Dec 12, 2023 2:11 pm
- Forum: Vensim
- Topic: Level initial series
- Replies: 4
- Views: 5347
Re: Level initial series
It sounds like you want a population stock that's moving approximately alongside the data from 1995-2023, then reset the population stock to precisely match the data at 2023, then have the population evolve into the future by endogenous forces? If so, there are several ways to do this. The general i...
Re: Percent
If the endpoint is fixed, you can use the approach of creating a variable.
If the endpoint is uncertain, specifically, not known at the start of the run, there isn't really a way to do this, except by postprocessing the output in some other tool (Excel, R, Python ...)
If the endpoint is uncertain, specifically, not known at the start of the run, there isn't really a way to do this, except by postprocessing the output in some other tool (Excel, R, Python ...)
- Wed Dec 06, 2023 3:35 pm
- Forum: Vensim
- Topic: Uniform data
- Replies: 2
- Views: 4832
Re: Uniform data
You can use these distributions either in equations, or via the sensitivity (Monte Carlo) tool.
- Tue Dec 05, 2023 4:36 pm
- Forum: Vensim
- Topic: older interface PLE 10.1.3
- Replies: 2
- Views: 4811
Re: older interface PLE 10.1.3
Is there something specific that you need from the older interface?
- Tue Dec 05, 2023 2:32 pm
- Forum: Vensim
- Topic: time schedule
- Replies: 4
- Views: 5424
Re: time schedule
There isn't a way to link to a spreadsheet in PLE.
- Wed Nov 29, 2023 3:34 pm
- Forum: Vensim
- Topic: Output File
- Replies: 6
- Views: 6761
Re: Output File
Or perhaps what you're looking for is an export of the dataset to Excel? Use Model>Export Dataset.
- Thu Nov 16, 2023 5:13 pm
- Forum: Ventity
- Topic: Function: choose
- Replies: 4
- Views: 7640
Re: Function: choose
I think there's an efficiency issue here. Because the 'identify' and 'update' triggers are in the Region entity, they're executing multiple times - i.e. every region is identifying the best region. I can think of a couple alternatives. - Move the trigger to a singleton entity like the Model. Putting...
Re: Lifecycle
1 - the PULSE TRAIN function might work
2 - you can solve this, but it may not be the best choice - https://metasd.com/2017/01/forrester-on ... ous-flows/
2 - you can solve this, but it may not be the best choice - https://metasd.com/2017/01/forrester-on ... ous-flows/
Re: Lifecycle
For inspiration, you might look to
C:\Users\Public\Vensim\Models\Sample\EXTRA\COMMOD.MDL
which installs with Vensim.
C:\Users\Public\Vensim\Models\Sample\EXTRA\COMMOD.MDL
which installs with Vensim.
Re: Lifecycle
I think your first step should be to adopt standard stock-flow notation in your diagram. Currently you have no flows, so your are integrating earlier age categories directly into later age categories, like Bull= INTEG ( -Bull+"Bullock 12-18", 0) Units: number ******************************...