Search found 4568 matches

by Administrator
Wed Mar 27, 2024 1:36 pm
Forum: Vensim
Topic: double-click selection
Replies: 5
Views: 107

Re: double-click selection

aliakhavan89 wrote: Mon Mar 25, 2024 9:28 pmDid you have something else in mind?
No, there are hundreds of places in Vensim where you can select text, that's why I asked for more info.
by Administrator
Tue Mar 26, 2024 1:06 pm
Forum: System Dynamics Discussion
Topic: Cumulative flow does not match stock
Replies: 2
Views: 76

Re: Cumulative flow does not match stock

1. Does your model pass the units test?

2. Have you selected an appropriate time step? https://www.vensim.com/documentation/ref_time_step.html

It's impossible to comment further without the model.
by Administrator
Mon Mar 25, 2024 9:09 pm
Forum: Vensim
Topic: double-click selection
Replies: 5
Views: 107

Re: double-click selection

Can you provide more detail please? Where are you clicking things? Can you give an example?
by Administrator
Mon Mar 25, 2024 6:58 pm
Forum: Vensim
Topic: Lables on Flows
Replies: 1
Views: 23

Re: Lables on Flows

We'll get this fixed as soon as possible.
by Administrator
Sat Mar 23, 2024 8:55 pm
Forum: Vensim
Topic: Vensim 8.0.0 download
Replies: 3
Views: 119

Re: Vensim 8.0.0 download

8.0.0 does not even run on modern Macs, you are best off using the latest version.
by Administrator
Sat Mar 23, 2024 6:27 pm
Forum: Vensim
Topic: Floating Point Error
Replies: 3
Views: 72

Re: Floating Point Error

To give you a little more help, try this burning of coal = min ( available coal resources / time step , base burning rate ) This equation burns the "base burning rate" until all the "available coal resources" are used up. This equation takes "base burning rate" from the...
by Administrator
Sat Mar 23, 2024 6:24 pm
Forum: Vensim
Topic: Floating Point Error
Replies: 3
Views: 72

Re: Floating Point Error

You do have units errors in your model.

Start with "base burning rate". That should not be measured in 1/year, I'm pretty certain it will be tonnes/year. Same for "base discovery rate". Correct the units for these, and you'll see where the error is.
by Administrator
Sat Mar 23, 2024 7:41 am
Forum: Vensim
Topic: it is frustrating!
Replies: 25
Views: 562

Re: it is frustrating!

All I did was put the graph onto the sketch using the IO tool.
by Administrator
Thu Mar 21, 2024 9:17 am
Forum: Vensim
Topic: it is frustrating!
Replies: 25
Views: 562

Re: it is frustrating!

Try the attached.
by Administrator
Wed Mar 20, 2024 2:51 pm
Forum: Vensim
Topic: Vensim 8.0.0 download
Replies: 3
Views: 119

Re: Vensim 8.0.0 download

All you can use is the latest version.
by Administrator
Tue Mar 19, 2024 12:01 pm
Forum: Vensim
Topic: it is frustrating!
Replies: 25
Views: 562

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...
by Administrator
Mon Mar 18, 2024 8:42 am
Forum: Vensim
Topic: publishing a model independently from its directory
Replies: 3
Views: 103

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.
by Administrator
Mon Mar 18, 2024 8:41 am
Forum: System Dynamics Discussion
Topic: Request of SD advice - Ph.D Thesis results
Replies: 5
Views: 227

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 ...
by Administrator
Mon Mar 18, 2024 8:37 am
Forum: Vensim
Topic: it is frustrating!
Replies: 25
Views: 562

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.
by Administrator
Wed Mar 13, 2024 4:22 pm
Forum: Vensim
Topic: Copy & Paste between models
Replies: 4
Views: 496

Re: Copy & Paste between models

Nub_User wrote: Wed Mar 13, 2024 3:04 pm :shock: I mean I can´t open two or more models in the same instance. :shock:
You can only do this in Vensim Pro/DSS.
by Administrator
Wed Mar 13, 2024 7:20 am
Forum: Vensim
Topic: Problems with MCMC and optimize payoff
Replies: 1
Views: 56

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.
by Administrator
Tue Mar 12, 2024 3:13 pm
Forum: Vensim
Topic: Sensitivity simulation - changing the file output format
Replies: 1
Views: 44

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...
by Administrator
Tue Mar 12, 2024 2:42 pm
Forum: Vensim
Topic: Help with PULSE TRAIN and random variable
Replies: 6
Views: 134

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.
by Administrator
Sat Mar 09, 2024 3:51 pm
Forum: Vensim
Topic: it is frustrating!
Replies: 25
Views: 562

Re: it is frustrating!

EWUK wrote: Sat Mar 09, 2024 1:32 pm One adding question to the last:

Why do the 4 curves in the graph not react to the slider variation of "interest rate"?
Greetings
U. Küppers
It's impossible to say as you haven't uploaded the model.
by Administrator
Sat Mar 09, 2024 1:23 pm
Forum: Vensim
Topic: it is frustrating!
Replies: 25
Views: 562

Re: it is frustrating!

Click the Options menu on the graph, then "Number lines".
by Administrator
Sat Mar 09, 2024 1:01 pm
Forum: System Dynamics Discussion
Topic: Vensim Models from Book
Replies: 4
Views: 152

Re: Vensim Models from Book

Are these copyrighted or do they need permission to share? If yes, they should not have been uploaded to the forum.
by Administrator
Sat Mar 09, 2024 8:28 am
Forum: Vensim
Topic: Optimization with wrong subscripts error
Replies: 4
Views: 106

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...
by Administrator
Fri Mar 08, 2024 3:45 pm
Forum: Vensim
Topic: Feature request: make loop polarity direction indicator vector graphics
Replies: 4
Views: 449

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.
by Administrator
Fri Mar 08, 2024 2:08 pm
Forum: Vensim
Topic: Explicit Stock-Flow Structure of the Pink Noise
Replies: 1
Views: 47

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...