Search found 3811 matches
- Thu Nov 02, 2023 2:47 pm
- Forum: Vensim
- Topic: Vensim Equation Auditing?
- Replies: 5
- Views: 2640
Re: Vensim Equation Auditing?
There isn't (but probably should be). Here's a trick I've used for this. Run the model, and export the run to a .tab file with time across and subscripts in their own columns. Deselecting units keeps things simple. Open the result in Excel. You can now count the output. Anything with a value in just...
- Thu Nov 02, 2023 2:39 pm
- Forum: Vensim
- Topic: inserting picture to comment failed due to permissions problem
- Replies: 4
- Views: 2233
Re: inserting picture to comment failed due to permissions problem
The permission issue seems weird, given the path. Presumably that's your own doc folder, and you have permission. I'm guessing that the message is misleading, and something else is causing it. Did you deliberately try to access these three folders, or was Vensim apparently on some kind of fishing ex...
- Thu Nov 02, 2023 2:33 pm
- Forum: Vensim
- Topic: insert picture into Aux / Stock variable?
- Replies: 1
- Views: 580
Re: insert picture into Aux / Stock variable?
It's not currently possible, but I agree that it would be nice. I'll ticket the feature request.
- Wed Nov 01, 2023 2:17 pm
- Forum: Vensim
- Topic: Bug: Very precise time settings for model
- Replies: 7
- Views: 8126
Re: Bug: Very precise time settings for model
I think we can have our cake and eat it too here.
- Mon Oct 30, 2023 9:13 pm
- Forum: Vensim
- Topic: Suppress simulation information window
- Replies: 3
- Views: 3869
Re: Suppress simulation information window
I think it's a bug - there are a few instances of warnings that ignore the settings check.
- Mon Oct 30, 2023 9:12 pm
- Forum: Vensim
- Topic: Vensim 10.1.1 macOS GUI Bug
- Replies: 8
- Views: 5851
Re: Vensim 10.1.1 macOS GUI Bug
I think this is an instance of one we're working on ... seems to be random breakage of the GUI library. Are you using Sonoma or Ventura or another OS version?
- Mon Oct 30, 2023 9:09 pm
- Forum: Vensim
- Topic: Random number generator; any tips to replicate?
- Replies: 15
- Views: 16386
- Mon Oct 30, 2023 9:07 pm
- Forum: Vensim
- Topic: Random number generator; any tips to replicate?
- Replies: 15
- Views: 16386
Re: Random number generator; any tips to replicate?
Restating what I stated above for clarity: If a modeler wanted every RANDOM-based function in a model to be independent of all of the others (not drawing from the same pool), then the functions should be called with different STREAM_IDS (https://www.vensim.com/documentation/stream_id.html). Someone...
- Mon Oct 30, 2023 9:03 pm
- Forum: Vensim
- Topic: Random number generator; any tips to replicate?
- Replies: 15
- Views: 16386
Re: Random number generator; any tips to replicate?
For instance, a model has RANDOM_UNIFORM and RANDOM_NORMAL, and is run to generate output1.vdfx. If a user then deletes the UNIFORM() function in one portion of the model and adds a UNIFORM() function in a different part of the model, will the functions be called in the same order? Will the random ...
- Mon Oct 30, 2023 8:56 pm
- Forum: Vensim
- Topic: Vensim DSS Crashing on Save When Viewing As Sketch
- Replies: 5
- Views: 1039
Re: Vensim DSS Crashing on Save When Viewing As Sketch
This has a lot of undefined variables that appear as A FUNCTION OF() in the text listing. Was the last operation before the crash a huge paste/replicate or something? There's some other strange stuff, like the string STX{...} in one equation. Do you have a previous edition of the model for compariso...
- Fri Oct 27, 2023 7:57 pm
- Forum: Vensim
- Topic: BUG? Control-<number> not select analysis tool
- Replies: 4
- Views: 3288
Re: BUG? Control-<number> not select analysis tool
Sounds like a bug, because it's still working on Win10 (assuming you're using a Mac).
- Fri Oct 27, 2023 1:10 pm
- Forum: Vensim
- Topic: When will the tool replacing Venapp available?
- Replies: 11
- Views: 1471
Re: When will the tool replacing Venapp available?
Are you looking for screen layout tools, or scripting/automating a set of actions to support interactive gaming or similar?
- Thu Oct 26, 2023 2:34 pm
- Forum: Vensim
- Topic: Cannot access Run configuration manager
- Replies: 3
- Views: 721
Re: Cannot access Run configuration manager
You might be using the old GUI. Tools>Switch to New GUI
Does that do it?
Does that do it?
- Thu Oct 26, 2023 2:23 pm
- Forum: Vensim
- Topic: Random number generator; any tips to replicate?
- Replies: 15
- Views: 16386
Re: Random number generator; any tips to replicate?
The version we're using is a little older, but same thing. It was very easy to implement - nothing special needed, but we did do extensive verification using the NIST suite and DieHard to be sure it was working. I think the goal of replication with random functions may be elusive, because order and ...
- Thu Oct 26, 2023 1:04 pm
- Forum: Ventity
- Topic: Function: choose
- Replies: 4
- Views: 7267
Re: Function: choose
Generically, I'd say the HH decides to migrate, then runs a Process List action to evaluate possible target regions. These are sorted by GSP or some more general measure of attractiveness. You limit processing to one iteration, and the HH changes its location attribute to match the leading candidate...
- Wed Oct 25, 2023 7:41 pm
- Forum: Vensim
- Topic: When will the tool replacing Venapp available?
- Replies: 11
- Views: 1471
Re: When will the tool replacing Venapp available?
Two other things are also available now:
- SDEverywhere https://sdeverywhere.org/
- Vensim publishing to WebAssembly https://www.vensim.com/documentation/pu ... -inte.html
- SDEverywhere https://sdeverywhere.org/
- Vensim publishing to WebAssembly https://www.vensim.com/documentation/pu ... -inte.html
- Tue Oct 24, 2023 5:42 pm
- Forum: Vensim
- Topic: What can be done to speed up model calibrations and MCMC?
- Replies: 4
- Views: 686
Re: What can be done to speed up model calibrations and MCMC?
Memory is generally not a constraint, and GPU acceleration is not supported. In the multicore version, speed is basically just cores x clock speed. If you have BIOS access to the machine, there may be some advantage to turning off hyperthreading, but this is a relatively small factor.
- Tue Oct 24, 2023 5:39 pm
- Forum: Vensim
- Topic: Error Message
- Replies: 6
- Views: 961
Re: Error Message
The subscript on QPD0 on the left side is vcd, and on the right side it's vc'd or vcd'. I'm not sure if the ' (prime) refers to differentiation or something else, but it's possible that the left and right side expressions are distinct things.
- Tue Oct 24, 2023 5:35 pm
- Forum: Vensim
- Topic: What can be done to speed up model calibrations and MCMC?
- Replies: 4
- Views: 686
Re: What can be done to speed up model calibrations and MCMC?
Are you running the latest multicore v10 version?
With Powell you need to select the XPARALLEL multistart option.
With MCMC you don't need to change anything. Initialization is not multithreaded, so you may want to switch to the "Underdisperse" method to get things going faster.
With Powell you need to select the XPARALLEL multistart option.
With MCMC you don't need to change anything. Initialization is not multithreaded, so you may want to switch to the "Underdisperse" method to get things going faster.
- Tue Oct 17, 2023 2:36 pm
- Forum: Vensim
- Topic: Find a shadow variable
- Replies: 2
- Views: 541
Re: Find a shadow variable
In v10+, select the variable on the diagram, making it the workbench var.
Hit F4, or menu Edit>Find Workbench. This will find the next instance of that variable.
If that's not the source node, hit F3, or menu Edit>Find Again.
Hit F4, or menu Edit>Find Workbench. This will find the next instance of that variable.
If that's not the source node, hit F3, or menu Edit>Find Again.
- Mon Oct 16, 2023 3:41 pm
- Forum: Vensim
- Topic: Multivariable data lookup and interpolation
- Replies: 1
- Views: 974
Re: Multivariable data lookup and interpolation
You have a syntax problem - '1' is not a valid cell reference. https://www.vensim.com/documentation/fn_get_xls_constants.html Not sure what you have in mind for interpolation. You have 4 inputs, but since they have to sum to 100%, it looks like a 3D space. I'm not sure there's a general procedure fo...
- Sun Oct 08, 2023 8:07 pm
- Forum: Vensim
- Topic: If then else function
- Replies: 1
- Views: 505
Re: If then else function
Ugh. The general framework will be something like: QFP1 = IF THEN ELSE( tfp>0 , IF THEN ELSE( expression beginning with pp>0 ,expression beginning with sum over QH ,expression beginning with sum over QH*fraction with pp in numerator ) , 0 ) It's pretty confusing subscripting though - I would strongl...
- Fri Oct 06, 2023 2:50 pm
- Forum: Vensim
- Topic: Subscript for time based variabel
- Replies: 4
- Views: 464
Re: Subscript for time based variabel
It's not really a comprehensive project model, but it does show how to set up the subscripting. Unless you do some really arcane stuff, you won't really be doing CPM in Vensim (or any other SD tool). But that's kind of the point: CPM ignores the cross-stage rework cycle, partial concurrency, and oth...
- Fri Oct 06, 2023 2:12 pm
- Forum: Vensim
- Topic: Subscript for time based variabel
- Replies: 4
- Views: 464
Re: Subscript for time based variabel
There's a subscripted project model in the User Guide:
https://www.vensim.com/documentation/21195.html
https://www.vensim.com/documentation/21195.html
- Tue Oct 03, 2023 8:42 pm
- Forum: Vensim
- Topic: Error opening older SD models in published works (Macintosh vmf files)
- Replies: 2
- Views: 1190
Re: Error opening older SD models in published works (Macintosh vmf files)
This must predate Apple reversing its approach to big/little endian byte order. I was able to open it in 6.4, but it runs with an error. In the meantime, my similar replication is here: https://metasd.com/2010/03/behavioral-analysis-of-learning-curve-strategy/ This copy is from an earlier version of...