Search found 3808 matches
- Fri May 26, 2023 5:11 pm
- Forum: Vensim
- Topic: Integrating Vensim DSS with Python
- Replies: 2
- Views: 982
- Tue May 23, 2023 9:25 pm
- Forum: Vensim
- Topic: Delay of random pulses
- Replies: 7
- Views: 1432
Re: Delay of random pulses
Ah, that makes sense. Pretty sure my example would work. If the entirety of the stock always flows out, then there's a simpler way.
- Tue May 23, 2023 8:14 pm
- Forum: Vensim
- Topic: Delay of random pulses
- Replies: 7
- Views: 1432
Re: Delay of random pulses
Try this?
- Tue May 23, 2023 8:03 pm
- Forum: Vensim
- Topic: Delay of random pulses
- Replies: 7
- Views: 1432
Re: Delay of random pulses
What's the purpose of this? If we knew, there might be some easier alternative.
You could certainly use SAMPLE IF TRUE, or the equivalent stock formulation, to store the height of the previous pulse, until needed when the next one occurs.
You could certainly use SAMPLE IF TRUE, or the equivalent stock formulation, to store the height of the previous pulse, until needed when the next one occurs.
- Sat May 20, 2023 1:03 am
- Forum: Vensim
- Topic: Showing maximum Slope
- Replies: 5
- Views: 1098
Re: Showing maximum Slope
You can use SAMPLE IF TRUE if you're trying to capture the maximum over time.
- Mon May 15, 2023 2:55 pm
- Forum: Vensim
- Topic: Seeking Guidance on Using Tabbed Array Function in Vensim Pro
- Replies: 3
- Views: 959
Re: Seeking Guidance on Using Tabbed Array Function in Vensim Pro
I just noticed that the equation in your screenshots doesn't have any subscripts. That's why it's not working - you're supplying multiple values for a single variable.
Click the "subscripts" button in the equation editor and add some dimensions to the variable.
Click the "subscripts" button in the equation editor and add some dimensions to the variable.
- Sat May 13, 2023 2:04 pm
- Forum: Vensim
- Topic: Seeking Guidance on Using Tabbed Array Function in Vensim Pro
- Replies: 3
- Views: 959
Re: Seeking Guidance on Using Tabbed Array Function in Vensim Pro
There's a sample model in the Help system.
https://www.vensim.com/documentation/fn ... array.html
Unless the array is large and needs to be pasted in from a spreadsheet, I find normal punctuation easier. You can define
The order is rows=a, columns=b.
https://www.vensim.com/documentation/fn ... array.html
Unless the array is large and needs to be pasted in from a spreadsheet, I find normal punctuation easier. You can define
Code: Select all
x[a,b]=
1,2,3;
4,5,6;
- Thu May 11, 2023 2:43 am
- Forum: Vensim
- Topic: "Blocked for this application" error
- Replies: 15
- Views: 2339
Re: "Blocked for this application" error
Works for me too ... but there are a lot of models. Is the problem in a particular one?
- Tue May 09, 2023 4:09 pm
- Forum: Vensim
- Topic: Connecting with data
- Replies: 8
- Views: 1509
Re: Connecting with data
In the example, 'data' is a variable name. There are a lot of possible layouts, including Tidy an relational, but typically something like this is easiest: 2023-05-09_10-07-17.png In the import dialog, you'll specify the "sub" columns as subscripts. The range names in the first row don't m...
- Tue May 09, 2023 4:01 pm
- Forum: Vensim
- Topic: Connecting with data
- Replies: 8
- Views: 1509
Re: Connecting with data
I think the issue you raise in #4 may be avoidable if you put cell addresses in an arrayed string function, but direct import from .csv or .tab is likely to be cleaner.
- Tue May 09, 2023 3:57 pm
- Forum: Vensim
- Topic: Connecting with data
- Replies: 8
- Views: 1509
Re: Connecting with data
If the Age x Operation x Health Trust matrix has a lot of empty elements, Ventity might be a good alternative. For example, a while ago I prototyped a model of consumer products, with detail like Market (country) x Flavor x Size. Not every flavor x size is offered in every country, so the full matri...
- Tue May 09, 2023 3:49 pm
- Forum: Vensim
- Topic: Connecting with data
- Replies: 8
- Views: 1509
Re: Connecting with data
There's a chapter in the User Guide, https://www.vensim.com/documentation/21160.html
Last year's conference workshop is online https://vensim.com/conference/#using-data-in-vensim
Last year's conference workshop is online https://vensim.com/conference/#using-data-in-vensim
- Mon May 08, 2023 3:15 am
- Forum: Vensim
- Topic: read_ini file
- Replies: 12
- Views: 1956
Re: read_ini file
If you let us know what functionality you're missing, it's likely that we can implement it in the new GUI more quickly than we can fix the old.
- Fri May 05, 2023 2:49 pm
- Forum: Ventity
- Topic: Interesting model - Sterman/Wittenberg Kuhnian Scientific Revolutions
- Replies: 0
- Views: 26266
- Fri May 05, 2023 12:39 pm
- Forum: Vensim
- Topic: Unit Check Error
- Replies: 7
- Views: 1468
Re: Unit Check Error
This is not a known issue, and therefore hard to diagnose without a sample.
- Tue May 02, 2023 1:24 pm
- Forum: Vensim
- Topic: Data import from excel question
- Replies: 2
- Views: 1212
Re: Data import from excel question
We would need a more specific question or example to work with.
Have you checked the User Guide in the help system?
https://www.vensim.com/documentation/usr16.html
Also:
https://vensim.com/conference/#using-data-in-vensim
Have you checked the User Guide in the help system?
https://www.vensim.com/documentation/usr16.html
Also:
https://vensim.com/conference/#using-data-in-vensim
- Fri Apr 28, 2023 12:58 am
- Forum: Vensim
- Topic: Step pattern
- Replies: 6
- Views: 1444
Re: Step pattern
Consider the following setup: p = PULSE TRAIN( ... ) v = INTEG( p, 0 ) The discrete integration via Euler's method takes steps like: v(time+time step) = v(time) + time step*p This makes it easy to see why the steps are small when TIME STEP is small. If instead you integrate: v = INTEG( p/TIME STEP, ...
- Wed Apr 26, 2023 9:45 pm
- Forum: Vensim
- Topic: Step pattern
- Replies: 6
- Views: 1444
Re: Step pattern
In other words, use a level to integrate a PULSE TRAIN.
Another option would be to use the ramp, and feed it to the QUANTUM function to make steps. QUANTUM is like INTEGER but with an arbitrary step size.
Another option would be to use the ramp, and feed it to the QUANTUM function to make steps. QUANTUM is like INTEGER but with an arbitrary step size.
- Tue Apr 25, 2023 11:02 pm
- Forum: Vensim
- Topic: Calculating demand
- Replies: 1
- Views: 1097
Re: Calculating demand
It's hard to say what's going wrong without an example model. However, one possibility is that what you're suggesting is not possible. If clothes last 7 years, then at most 1/7th can go to the landfill per year. In any case, your decision rule for buying new clothes must: - replace clothes discarded...
- Tue Apr 25, 2023 4:44 pm
- Forum: Vensim
- Topic: "Blocked for this application" error
- Replies: 15
- Views: 2339
Re: "Blocked for this application" error
You can google the same via "site:www.ventanasystems.co.uk resource file" - but it won't help because there's evidently an installer bug - I can replicate your experience. We'll get it fixed ASAP.
- Sat Apr 22, 2023 12:07 pm
- Forum: Vensim
- Topic: "Blocked for this application" error
- Replies: 15
- Views: 2339
Re: "Blocked for this application" error
One possibility is that it uses subscripts, which won't work in PLE. You could try opening it with the free Model Reader instead.
- Fri Apr 21, 2023 11:44 pm
- Forum: Vensim
- Topic: Vensim works according to a mathematic equations? Anyone can help me, please?!
- Replies: 7
- Views: 1800
Re: Vensim works according to a mathematic equations? Anyone can help me, please?!
There isn't really an easy, general way to do this, but you could do something like the following. You have 3 stocks, but since they're conserved, there are really only 2 degrees of freedom. So you could parameterize the initial values of the stocks as something like: neutral = population * frac neu...
- Fri Apr 21, 2023 1:11 pm
- Forum: Vensim
- Topic: Screen display
- Replies: 4
- Views: 1340
Re: Screen display
Setting the zoom to a fixed level should solve this.
Also, you may want to hide variables rather than deleting them. That way you can do everything in one model, and even one view.
Also, you may want to hide variables rather than deleting them. That way you can do everything in one model, and even one view.
- Thu Apr 20, 2023 4:31 pm
- Forum: Vensim
- Topic: No Mail received for PLE-download
- Replies: 4
- Views: 1178
Re: No Mail received for PLE-download
I just made some changes to our mail configuration that *might* help with web.de in the future. Some hosts are just really aggressive at filtering and therefore create some false positives unfortunately.
- Thu Apr 20, 2023 2:13 pm
- Forum: Ventity
- Topic: Documentation bug?
- Replies: 2
- Views: 2806
Re: Documentation bug?
Ticketed for improvement.