Search found 2797 matches

by tomfid
Tue Nov 05, 2019 3:18 pm
Forum: Vensim
Topic: Allocation by Priority and Demand Values
Replies: 20
Views: 517

Re: Allocation by Priority and Demand Values

We'll need the data file to run it.
by tomfid
Tue Nov 05, 2019 3:15 pm
Forum: Ventity
Topic: "The configuration is read only" error
Replies: 13
Views: 491

Re: "The configuration is read only" error

The problem is typically with %appdata%/Local/VentityConfig.xml.

I'll check with the programming team for other ideas.
by tomfid
Mon Nov 04, 2019 9:53 pm
Forum: Vensim
Topic: Allocation by Priority and Demand Values
Replies: 20
Views: 517

Re: Allocation by Priority and Demand Values

What is the problem symptom?
by tomfid
Mon Nov 04, 2019 3:13 pm
Forum: Vensim
Topic: Allocation by Priority and Demand Values
Replies: 20
Views: 517

Re: Allocation by Priority and Demand Values

Or email us.

What are the symptoms of not working quite right? This has been tested and used extensively, so a bug is possible but unlikely.
by tomfid
Sun Nov 03, 2019 4:32 pm
Forum: Vensim
Topic: Allocation by Priority and Demand Values
Replies: 20
Views: 517

Re: Allocation by Priority and Demand Values

You might compare your version to the sample model in the Help system.

I think we can't diagnose this without more information - a model, or at least the relevant subscripts and related equations.
by tomfid
Tue Oct 29, 2019 9:31 pm
Forum: Vensim
Topic: Allocation by Priority and Demand Values
Replies: 20
Views: 517

Re: Allocation by Priority and Demand Values

OK, nice work!
by tomfid
Tue Oct 29, 2019 8:41 pm
Forum: Vensim
Topic: sensitivity analysis (vensim)
Replies: 35
Views: 1724

Re: sensitivity analysis (vensim)

Actually, I see that the error happens on sim 1. Looking at the code, the counter for writing sensitivity result blocks is an integer, which will impose a 2 gigabyte limit per simulation. Any chance you're near that?
by tomfid
Tue Oct 29, 2019 7:09 pm
Forum: Vensim
Topic: sensitivity analysis (vensim)
Replies: 35
Views: 1724

Re: sensitivity analysis (vensim)

Are you using 32 or 64 bit Vensim? If you do a run with only 1 sensitivity instance (if you can), how big is the file size increment over a non-sensitivity vdf file?
by tomfid
Tue Oct 29, 2019 3:05 pm
Forum: Ventity
Topic: "The configuration is read only" error
Replies: 13
Views: 491

Re: "The configuration is read only" error

Sorry - 3.0.2 (3.0.3 is internal).
by tomfid
Tue Oct 29, 2019 2:27 pm
Forum: Ventity
Topic: "The configuration is read only" error
Replies: 13
Views: 491

Re: "The configuration is read only" error

This could be an operating system lockdown of the config file. Are you running the latest 3.0.3?
by tomfid
Tue Oct 29, 2019 2:26 pm
Forum: Vensim
Topic: Publish model in VPM format from Vensim 8.04
Replies: 8
Views: 252

Re: Publish model in VPM format from Vensim 8.04

Ah ... the v8 publication will contain a vmfx, which won't run in v7. We can rebuild the MC library for the new format if needed.
by tomfid
Mon Oct 28, 2019 10:50 pm
Forum: Vensim
Topic: Publish model in VPM format from Vensim 8.04
Replies: 8
Views: 252

Re: Publish model in VPM format from Vensim 8.04

If the model was moved to Vensim v7 in mdl format, published in v7, and run with the v7 dll, then it's hard to see how the v8 changes could be involved. Maybe a change in the scripting or data?
by tomfid
Mon Oct 28, 2019 10:48 pm
Forum: Vensim
Topic: How to deal with the warnings in Vensim
Replies: 5
Views: 3131

Re: How to deal with the warnings in Vensim

Yes - it's on the Tools>Options>Settings menu/dialog.
by tomfid
Mon Oct 28, 2019 8:00 pm
Forum: Vensim
Topic: Error in "GET XLS DATA" when I run a model that previously worked fine
Replies: 6
Views: 241

Re: Error in "GET XLS DATA" when I run a model that previously worked fine

This is fixed in 8.0.6. The problem appears to be Microsoft changes for OneDrive/Sharepoint integration.
by tomfid
Mon Oct 28, 2019 7:57 pm
Forum: Vensim
Topic: Subscript Subrange
Replies: 5
Views: 234

Re: Subscript Subrange

I should mention that this kind of situation is potentially a good candidate for Ventity as well.
by tomfid
Mon Oct 28, 2019 7:56 pm
Forum: Vensim
Topic: BUG: Vensim Manuals inaccessible in Mac 8.0.3
Replies: 10
Views: 351

Re: BUG: Vensim Manuals inaccessible in Mac 8.0.3

Great! We also fixed Help system file links on the Windows side.
by tomfid
Mon Oct 28, 2019 5:44 pm
Forum: Vensim
Topic: sensitivity analysis (vensim)
Replies: 35
Views: 1724

Re: sensitivity analysis (vensim)

Any chance that the disk really is full (or would be, after writing the results)?
by tomfid
Wed Oct 23, 2019 2:51 pm
Forum: Vensim
Topic: Automatizing optimization
Replies: 5
Views: 259

Re: Automatizing optimization

Convergence is a difficult notion for random multistart - it's more like "failure to improve." You could simply limit the number of restarts - there's a parameter for that in the voc.
by tomfid
Wed Oct 23, 2019 2:07 pm
Forum: Vensim
Topic: Automatizing optimization
Replies: 5
Views: 259

Re: Automatizing optimization

The weights can be model variables, so you wouldn't have to mess around with editing the vpd - you could just change the weights via SETVAL.
by tomfid
Tue Oct 22, 2019 11:29 pm
Forum: Vensim
Topic: Modeling an asymmetric effect
Replies: 2
Views: 161

Re: Modeling an asymmetric effect

I'd be interested to know what effects are omitted in the literature, because obviously there should be a supply response to higher prices, all else equal. Presumably the problem is land and legal constraints, or labor costs rising with prices, or something like that. A simple formulation would be s...
by tomfid
Mon Oct 21, 2019 2:07 pm
Forum: Vensim
Topic: Data variables
Replies: 2
Views: 154

Re: Data variables

You're probably seeing the data because the vdf containing it is loaded. You just can't run with it.

There is one workaround, which is to put the data in a lookup.
by tomfid
Fri Oct 18, 2019 4:00 pm
Forum: Vensim
Topic: synthesim (sim setup) in Vensim reader vs PLE vs DSS
Replies: 1
Views: 119

Re: synthesim (sim setup) in Vensim reader vs PLE vs DSS

The reader and DSS provide some additional features, like overrides and .cin file handling.

https://vensim.com/running-models-with- ... el-reader/
by tomfid
Fri Oct 18, 2019 3:57 pm
Forum: Vensim
Topic: Forecast or What?
Replies: 2
Views: 148

Re: Forecast or What?

The FORECAST function is just trend-extrapolation, which is sometimes useful but often pretty dumb. A more sophisticated approach would be to build a model that captures the driving forces for production, and fit the model to this data (by hand or by optimization). Then the model generates the forec...
by tomfid
Thu Oct 17, 2019 5:50 pm
Forum: Vensim
Topic: Subscript Subrange
Replies: 5
Views: 234

Re: Subscript Subrange

You can definitely use subranges for this. https://www.vensim.com/documentation/22100.htm I find it easiest to build them up hierarchically. For example: single : (single1-single50) twin : (twin1-twin50) aircraft : single, twin Then you can write distinct equations for maintenance[single] and mainte...
by tomfid
Thu Oct 17, 2019 4:49 pm
Forum: Vensim
Topic: Error in "GET XLS DATA" when I run a model that previously worked fine
Replies: 6
Views: 241

Re: Error in "GET XLS DATA" when I run a model that previously worked fine

You can switch to text view (View>As Text) and use the search & replace (Edit>Replace String). Or, save the model to mdl and use your favorite text editor (Notepad++ is good and free).