Search found 4659 matches
- Thu Mar 21, 2024 9:17 am
- Forum: Vensim
- Topic: it is frustrating!
- Replies: 25
- Views: 8741
Re: it is frustrating!
Try the attached.
- Wed Mar 20, 2024 2:51 pm
- Forum: Vensim
- Topic: Vensim 8.0.0 download
- Replies: 3
- Views: 2666
Re: Vensim 8.0.0 download
All you can use is the latest version.
- Tue Mar 19, 2024 12:01 pm
- Forum: Vensim
- Topic: it is frustrating!
- Replies: 25
- Views: 8741
Re: it is frustrating!
1. there is a problem with the function under "plant growth", I can´t solve. You used "[" and "]" for brackets, you cannot do that unless working with subscripts. Change the equation to growth rate*consumption level*Environmental pollution*(1-(consumption level*Environ...
- Mon Mar 18, 2024 8:42 am
- Forum: Vensim
- Topic: publishing a model independently from its directory
- Replies: 3
- Views: 2923
Re: publishing a model independently from its directory
It should be independent of the folder. But it's impossible to help further without a published model to look at. If you have hard coded the path to a spreadsheet in the model, then that would cause this problem.
- Mon Mar 18, 2024 8:41 am
- Forum: System Dynamics Discussion
- Topic: Request of SD advice - Ph.D Thesis results
- Replies: 5
- Views: 5796
Re: Request of SD advice - Ph.D Thesis results
There are two things I do not like to see when reading papers. 1. Models that have unit errors or missing units. I immediately assume the model is full of errors. If the model cannot past this basic check, then it suggests to me that the author has not taken the time to make sure things are correct ...
- Mon Mar 18, 2024 8:37 am
- Forum: Vensim
- Topic: it is frustrating!
- Replies: 25
- Views: 8741
Re: it is frustrating!
Same answer as before, it's impossible to say anything as you haven't uploaded the model. We cannot possibly know why the lines are not moving without seeing the model.
- Wed Mar 13, 2024 4:22 pm
- Forum: Vensim
- Topic: Copy & Paste between models
- Replies: 4
- Views: 3563
- Wed Mar 13, 2024 7:20 am
- Forum: Vensim
- Topic: Problems with MCMC and optimize payoff
- Replies: 1
- Views: 2076
Re: Problems with MCMC and optimize payoff
We would need the model and VPD file to offer any help. There is clearly an error in that file.
- Tue Mar 12, 2024 3:13 pm
- Forum: Vensim
- Topic: Sensitivity simulation - changing the file output format
- Replies: 1
- Views: 1871
Re: Sensitivity simulation - changing the file output format
1/Is it possible to obtain a "*_sens_trace" file with variables in columns? Not any more. You can easily do what you need in Excel though. 3/About the .cin file, I suppose it is an error log, but what type of errors are highlighted? I only see variables equal to a specific value, but I do...
- Tue Mar 12, 2024 2:42 pm
- Forum: Vensim
- Topic: Help with PULSE TRAIN and random variable
- Replies: 6
- Views: 3517
Re: Help with PULSE TRAIN and random variable
SAMPLE IF TRUE will hold a value until something is "true". So create a variable that equals 1 every 365 days, and use that in the call to SAMPLE IF TRUE.
- Sat Mar 09, 2024 3:51 pm
- Forum: Vensim
- Topic: it is frustrating!
- Replies: 25
- Views: 8741
- Sat Mar 09, 2024 1:23 pm
- Forum: Vensim
- Topic: it is frustrating!
- Replies: 25
- Views: 8741
Re: it is frustrating!
Click the Options menu on the graph, then "Number lines".
- Sat Mar 09, 2024 8:28 am
- Forum: Vensim
- Topic: Help with PULSE TRAIN and random variable
- Replies: 6
- Views: 3517
- Sat Mar 09, 2024 8:28 am
- Forum: Vensim
- Topic: Optimization with wrong subscripts error
- Replies: 4
- Views: 2471
Re: Optimization with wrong subscripts error
I'll see if I can improve the error reporting. Maybe if I just change ERROR: Cannot find constant in model To one of the following depending on what is in the optimization control file. ERROR: Constant not found in model, cannot continue. or ERROR: Constant found in model, but no subscripts in optim...
- Fri Mar 08, 2024 3:45 pm
- Forum: Vensim
- Topic: Feature request: make loop polarity direction indicator vector graphics
- Replies: 4
- Views: 2487
Re: Feature request: make loop polarity direction indicator vector graphics
The old GUI is no longer supported. The new GUI already does quite a lot more than the old (such as vector graphics).
You can also find a SVG of the image you want, save it to the model folder and use that as an image.
You can also find a SVG of the image you want, save it to the model folder and use that as an image.
- Fri Mar 08, 2024 2:08 pm
- Forum: Vensim
- Topic: Explicit Stock-Flow Structure of the Pink Noise
- Replies: 1
- Views: 1664
Re: Explicit Stock-Flow Structure of the Pink Noise
It comes from Tom's blog, but I think there was a slight modification before we put it directly into Vensim. https://metasd.com/2010/03/pink-noise/ :MACRO: RANDOM PINK NOISE(mean, std deviation, correlation time, seed) RANDOM PINK NOISE = INTEG(updating pink noise,mean+std deviation*RANDOM NORMAL(-6...
- Fri Mar 08, 2024 8:15 am
- Forum: Vensim
- Topic: Optimization with wrong subscripts error
- Replies: 4
- Views: 2471
Re: Optimization with wrong subscripts error
Do you have an example you can provide? I can probably make changes very quickly.
- Fri Mar 08, 2024 8:14 am
- Forum: Vensim
- Topic: Issue with the name run
- Replies: 1
- Views: 1565
Re: Issue with the name run
I'll raise this as a problem. You could try "Ratio of scrapped car = 0.5.vdfx". Traditionally in Vensim, you don't need to specify the filename extension when running a simulation. For example, you can enter "run 01" and Vensim will create "run 01.vdfx". Vensim searches...
- Thu Mar 07, 2024 11:51 am
- Forum: Vensim
- Topic: it is frustrating!
- Replies: 25
- Views: 8741
Re: it is frustrating!
You need a custom graph. Open the control panel (button near right of the top toolbar), one of the tabs allows you to create a custom graph with more than one variable.
- Tue Mar 05, 2024 3:37 pm
- Forum: System Dynamics Discussion
- Topic: Unit errors with LOOKUP
- Replies: 1
- Views: 4189
Re: Unit errors with LOOKUP
Those are actually warnings that you have passed a variable to a lookup that has a unit.
Traditionally, lookups are supposed to have a dimensionless X axis.
The following help entry details what you can do.
https://www.vensim.com/documentation/22280.html
Traditionally, lookups are supposed to have a dimensionless X axis.
The following help entry details what you can do.
https://www.vensim.com/documentation/22280.html
- Tue Mar 05, 2024 1:32 pm
- Forum: Vensim
- Topic: it is frustrating!
- Replies: 25
- Views: 8741
Re: it is frustrating!
The graphic tools are "at a point in time", they will not update during SyntheSim.
But you can add a graph to the sketch, that will update during SyntheSim.
But you can add a graph to the sketch, that will update during SyntheSim.
- Mon Mar 04, 2024 3:08 pm
- Forum: Vensim
- Topic: Trouble Opening .vdf File in v10.1.3
- Replies: 1
- Views: 1453
Re: Trouble Opening .vdf File in v10.1.3
Can you upload the file? How large is it?
- Mon Mar 04, 2024 1:00 pm
- Forum: Vensim
- Topic: publishing a model on a web server
- Replies: 3
- Views: 2078
- Mon Mar 04, 2024 11:31 am
- Forum: Vensim
- Topic: it is frustrating!
- Replies: 25
- Views: 8741
- Mon Mar 04, 2024 8:32 am
- Forum: Vensim
- Topic: publishing a model on a web server
- Replies: 3
- Views: 2078
Re: publishing a model on a web server
Ther are some limitations to publish a model on the web. It is sais in the documentation that: At present, only the active model view is published. What is the active model view? This is the sketch you are looking at when you click File->Publish to web. Does it mean that if you have ma model with m...