Hi Tom,
Thanks for the prompt reply. After receiving your reply, I ran some tests. It seems that the function Delay 1 only duplicates the behaviour of a first order delay and Delay 1I if Input = 0 at Starttime. My safest option is then to always use Delay1I, and not Delay1.
Thanks
Schalk
Search found 13 matches
- Wed Oct 29, 2014 8:02 am
- Forum: Vensim
- Topic: Delay 1 behaviour
- Replies: 2
- Views: 2529
- Tue Oct 28, 2014 6:05 pm
- Forum: Vensim
- Topic: Delay 1 behaviour
- Replies: 2
- Views: 2529
Delay 1 behaviour
Hi all I run Vensim Professional on Windows OS 7. The behaviour of Delay 1 should be the same as a first-order delay. However, when I use a constant inflow, the outflow equals the inflow, ignoring the Delay 1 function. It does not matter what Time Step I use. I tested it on the attached model, on th...
- Sat Oct 25, 2014 4:23 pm
- Forum: Vensim
- Topic: Unable to complete graph
- Replies: 3
- Views: 2913
Re: Unable to complete graph
Hi Tom,
Thanks for the quick feedback.
I ran the model on another computer, and was also unable to replicate the behaviour. Seems the problem lies with my laptop. However, the IO solution works great - thanks a lot.
Regards
Thanks for the quick feedback.
I ran the model on another computer, and was also unable to replicate the behaviour. Seems the problem lies with my laptop. However, the IO solution works great - thanks a lot.
Regards
- Fri Oct 24, 2014 9:50 am
- Forum: Vensim
- Topic: Unable to complete graph
- Replies: 3
- Views: 2913
Unable to complete graph
Hi, I upgraded to Windows 7. Each time I create a custom graph, it runs fine first time. However, thereafter I get an error message "unable to complete graph", for both the custom graph and any of the other graph functions. I attach a sample model, duplicated from Vensim Help, User Guide, ...
- Wed Jan 08, 2014 8:56 am
- Forum: Vensim
- Topic: Problem with reading Data variable
- Replies: 6
- Views: 4621
Re: Problem with reading Data variable
Hi Tony, Thanks a lot, your first solution addressed my problem. Just as a matter of interest, I am experimenting with Kim Warren's (Strategy Management Dynamics) approach of reflecting historical, feared and preferred (modelled) outcomes in Vensim. For historical I use a data variable, feared = ref...
- Tue Jan 07, 2014 10:26 am
- Forum: Vensim
- Topic: Problem with reading Data variable
- Replies: 6
- Views: 4621
Re: Problem with reading Data variable
Hi Tony, Thanks for the prompt reply - you obviously know how frustrating it can be to find an error in a model :D I've learned something new - it is the variable in the spreadsheet / CSV / tab delimited file that must have the same name as the variable in the Vensim model, not the filename that mus...
- Mon Jan 06, 2014 9:15 am
- Forum: Vensim
- Topic: Problem with reading Data variable
- Replies: 6
- Views: 4621
Problem with reading Data variable
Hi, I use Vensim Pro 6.2, running Windows 7. My model does not read the data, returns error message: WARNING: No data found for -CO2 level history- in the exogenous data files. WARNING: No data found for -emissions history- in the exogenous data files. . I have tried Model Import Dataset from xls fi...
- Mon Aug 12, 2013 6:57 am
- Forum: Vensim
- Topic: model check - variable not defined
- Replies: 4
- Views: 4352
Re: model check - variable not defined
Thanks Tom,
This helps a lot.
Thanks for your patience and clear answers. By the way, I enjoyed and benefitted from your videopresentation on lookup tables (picked up the reference from one of the posts)
Regards
schalk
This helps a lot.
Thanks for your patience and clear answers. By the way, I enjoyed and benefitted from your videopresentation on lookup tables (picked up the reference from one of the posts)
Regards
schalk
- Sun Aug 11, 2013 8:03 am
- Forum: Vensim
- Topic: increasing model speed
- Replies: 6
- Views: 7597
Re: increasing model speed
Thanks for the tip JJ. Great to learn something like this early in one's modelling career.
Regards
Schalk
Regards
Schalk
- Fri Aug 09, 2013 8:10 pm
- Forum: Vensim
- Topic: model check - variable not defined
- Replies: 4
- Views: 4352
Re: model check - variable not defined
Hello Tom, Thanks for the quick reply and excellent advice. I really feel the fool now - did not expect of you to pick up my errors. And I felt so good using the Find function to fix all my errors :oops: But the model seems fine now, except for three variables apparently not used in the model. Must ...
- Fri Aug 09, 2013 8:34 am
- Forum: Vensim
- Topic: model check - variable not defined
- Replies: 4
- Views: 4352
model check - variable not defined
Hi all, I am a novice modeller in Vensim, and are rebuilding models I find in articles and books to learn how to model. I have Vensim 6.1C Professional, and run it on Windows 7 Professional and Windows 7 Home. I used the Text Editor to enter a model developed by Nicole Zimmerman in her book Dynamics...
- Sat Aug 03, 2013 9:53 am
- Forum: Vensim
- Topic: Error Message -[variable name] - is not used in the model
- Replies: 5
- Views: 6885
Re: Error Message -[variable name] - is not used in the mode
Thank you very much. As a matter of interest, I changed one of the delay functions, which then solved all those errors. Haven't yet foolowed the path to see why. Regarding the unit errors, I used exactly the same units as per the original model. However, I take your point, and am working through of ...
- Fri Aug 02, 2013 6:58 pm
- Forum: Vensim
- Topic: Error Message -[variable name] - is not used in the model
- Replies: 5
- Views: 6885
Re: Error Message -[variable name] - is not used in the mode
Elementary start-up model.mdl I got the same error message. I replicated the model in "An elementary dynamic model of a small start up firm" by Prof. Dr. Rainer Schwarz and Dipl.-Ing. Frank Schoneborn. Model check gives two error messages: "Customer acquisition not used in the model&...