Search found 4678 matches

by Administrator
Tue Nov 05, 2024 11:52 am
Forum: Vensim
Topic: Simple way to invert polarity of all links to and from a variable?
Replies: 1
Views: 47

Re: Simple way to invert polarity of all links to and from a variable?

It will need to be a manual process, there is no way to invert the polarities.

But it is relatively quick. Make sure the sketch is unlocked, select the arrows, then press either + or -. The polarity will be applied to all selected arrows.
by Administrator
Mon Nov 04, 2024 9:32 am
Forum: Vensim
Topic: units for %
Replies: 10
Views: 182

Re: units for %

Use DMNL (dimensionless).
by Administrator
Sat Nov 02, 2024 9:10 pm
Forum: Vensim
Topic: Reiterating Data
Replies: 14
Views: 284

Re: Reiterating Data

Get data at time could possibly be used. You can use the modulo function to work out the time at which to get the data.
by Administrator
Mon Oct 28, 2024 1:01 pm
Forum: Vensim
Topic: BUG: Zoom text field not accept numbers when blank
Replies: 1
Views: 115

Re: BUG: Zoom text field not accept numbers when blank

That is hard coded so it will only accept something between 6 and 500. So if you type "1" (in order to enter 100), it fails as "1" is invalid.

I'll change the code so it checks when you click OK instead.
by Administrator
Mon Oct 28, 2024 8:44 am
Forum: System Dynamics Discussion
Topic: Apply measures to Lookup
Replies: 3
Views: 389

Re: Apply measures to Lookup

You can use something like
value at 2025 = initial ( Lookup table(2025) )
by Administrator
Mon Oct 28, 2024 8:43 am
Forum: Vensim
Topic: Function Examples
Replies: 1
Views: 183

Re: Function Examples

The intention is that you find the sample models via their help page. For example, the following page has the link to the sample model. https://www.vensim.com/documentation/fn_allocate_by_priority.html I've created a temporary html file in the function examples folder that lists them all. I'll need ...
by Administrator
Fri Oct 25, 2024 12:38 pm
Forum: System Dynamics Discussion
Topic: Apply measures to Lookup
Replies: 3
Views: 389

Re: Apply measures to Lookup

This is just a guess as you haven't provided much to go on. CONSTANT POPULATION GROWTH RATE = 30? CONSTANT POPULATION GROWTH RATE START TIME = 2040 {year} CONSTANT POPULATION GROWTH RATE END TIME = 2070 {year} IF THEN ELSE ( time > CONSTANT POPULATION GROWTH RATE START TIME :and: time < CONSTANT POP...
by Administrator
Fri Oct 25, 2024 10:50 am
Forum: Vensim
Topic: Symbols for avalanche & scale (Loop identifier pictures) please as vector graphic
Replies: 1
Views: 222

Re: Symbols for avalanche & scale (Loop identifier pictures) please as vector graphic

Can you share an example?

The internal clipart is all SVG now, but they do render to a bitmap for drawing. I can look at embedding SVG images instead, not sure how that might work though.
by Administrator
Thu Oct 24, 2024 6:17 pm
Forum: Vensim
Topic: Error OE2132B?
Replies: 1
Views: 212

Re: Error OE2132B?

I don't ever recall seeing that. It's an internal Vensim error related to the error log.

Are you using the new or old GUI?
by Administrator
Thu Oct 24, 2024 7:23 am
Forum: Vensim
Topic: SDEverywhere vs. reality checks
Replies: 5
Views: 494

Re: SDEverywhere vs. reality checks

I cannot comment on SDEverywhere (I totally failed to make it work the one time I tried, but that was quite a while back). I believe the SDEverywhere checks are more geared towards checking that it is working correctly rather than checking a model is doing what it should. A really useful check I alw...
by Administrator
Mon Oct 21, 2024 12:43 pm
Forum: Vensim
Topic: Improving equation
Replies: 2
Views: 367

Re: Improving equation

I'd make a couple of small changes first. Putting numbers into equations is generally considered bad practice as anyone looking at the model will have no idea what they are. MAX MOTORIZATION RATE = 850 (Units:car/kperson) GROWTH RATE WHEN MAX MOTORIZATION ACTIVE = 0.01 (Units:DMNL) IF THEN ELSE(&quo...
by Administrator
Thu Oct 10, 2024 7:35 am
Forum: Vensim
Topic: "No runs are loaded. Please load runs."
Replies: 8
Views: 970

Re: "No runs are loaded. Please load runs."

Have you run the model yet? If you are trying to use any output tools, you first need to run the model to generate results.
by Administrator
Mon Oct 07, 2024 2:44 pm
Forum: System Dynamics Discussion
Topic: Logistic Model from Data
Replies: 2
Views: 765

Re: Logistic Model from Data

I cannot see why not. You would need PLE+/Pro/DSS to bring data into Vensim.
by Administrator
Fri Oct 04, 2024 7:43 pm
Forum: Vensim
Topic: The error report was sent to us.
Replies: 3
Views: 717

Re: The error report was sent to us.

I've seen this on the Mac, and I'm not sure why it doesn't wait (it should).

An email address would be great, if it's a problem we haven't seen before, I can then get in touch.
by Administrator
Fri Oct 04, 2024 7:41 pm
Forum: Vensim
Topic: Saving files
Replies: 6
Views: 1696

Re: Saving files

Almost certainly a permissions issue. You'll need to search the web for how to allow an application on MacOS access folders.
by Administrator
Fri Oct 04, 2024 7:40 pm
Forum: Vensim
Topic: loading of data
Replies: 5
Views: 940

Re: loading of data

Your only option is to load it into a lookup table. Vensim PLE does not support external data.
by Administrator
Wed Oct 02, 2024 3:58 pm
Forum: Vensim
Topic: Converting Stella model to Vensim
Replies: 3
Views: 676

Re: Converting Stella model to Vensim

If you can email the model to us, we may be able to get it to load.
by Administrator
Mon Sep 30, 2024 7:02 am
Forum: Vensim
Topic: Finding unique feedback loops
Replies: 3
Views: 767

Re: Finding unique feedback loops

No. Even for small models, the number of loops can run into millions.
by Administrator
Wed Sep 25, 2024 4:21 pm
Forum: Vensim
Topic: Issue with Python Integration of Vensim Model (Reinstall Vensim Error 977)
Replies: 4
Views: 939

Re: Issue with Python Integration of Vensim Model (Reinstall Vensim Error 977)

melistugrul wrote: Tue Sep 24, 2024 6:28 pm Hi, I have the same problem too. When I reinstall Vensim, dll file is automatically downloaded to "c:\program files (x86)\vensim" file. What can I do in that situation?
Your profile says you are a PLE user, the DLL does not come with PLE.

Or did you get the DLL from somewhere else?
by Administrator
Fri Sep 20, 2024 10:34 am
Forum: Vensim
Topic: Issue with Python Integration of Vensim Model (Reinstall Vensim Error 977)
Replies: 4
Views: 939

Re: Issue with Python Integration of Vensim Model (Reinstall Vensim Error 977)

Your path to the DLL is wrong. Why did you move the DLL to "c:\program files (x86)\vensim"?
by Administrator
Fri Sep 20, 2024 9:08 am
Forum: Vensim
Topic: Delay Fixed
Replies: 5
Views: 1026

Re: Delay Fixed

I think the sample model is a poor demonstration of the function. I'll replace it in the near future.
by Administrator
Fri Sep 20, 2024 8:59 am
Forum: Vensim
Topic: Print-Every table bug?
Replies: 1
Views: 507

Re: Print-Every table bug?

It's a bug, and will be fixed in the next release.
by Administrator
Thu Sep 19, 2024 7:30 am
Forum: Vensim
Topic: Switch to Light mode
Replies: 4
Views: 851

Re: Switch to Light mode

Yes, we'll get this fixed.
by Administrator
Wed Sep 18, 2024 3:33 pm
Forum: Vensim
Topic: Switch to Light mode
Replies: 4
Views: 851

Re: Switch to Light mode

No, you cannot switch the app itself into light mode. You can switch the sketch though (under the view menu).