Search found 6 matches

by lookingfor17
Wed Dec 08, 2010 6:00 pm
Forum: Vensim
Topic: simultaneous equations involving?
Replies: 9
Views: 21797

Re: simultaneous equations involving?

I have correct my model and get a satisfied result due to your help.
Thank you very much!

Joy
by lookingfor17
Wed Dec 08, 2010 2:33 pm
Forum: Vensim
Topic: simultaneous equations involving?
Replies: 9
Views: 21797

simultaneous equations involving?

when i was trying to run my model, vensim showed that model has errors and cannot be simulated. The reason is simultaneous equations involving. How to solve this problem?

thank you.
Joy
by lookingfor17
Sun Apr 18, 2010 2:53 pm
Forum: Vensim
Topic: looking for help--why the curves end up in different extremu
Replies: 6
Views: 4681

Ahh~ I see!!!

I shouldn`t have such a hypothesis! And the result of model running is normal!

Thank you very very very much!!!
I really appreciate your help!
Now I can finish my paper.:D

Joy
by lookingfor17
Sat Apr 17, 2010 6:04 pm
Forum: Vensim
Topic: looking for help--why the curves end up in different extremu
Replies: 6
Views: 4681

Thank you for your hints. I will take your advice. But I still cannnot understand how to make a "negative feedback look that ends basically comparing the level to the final value ". I have linked a lookup which slowly goes down. I have thought that it could make this feedback a negative on...
by lookingfor17
Fri Apr 16, 2010 11:25 pm
Forum: Vensim
Topic: looking for help--why the curves end up in different extremu
Replies: 6
Views: 4681

I have uploaded my model. I am sorry that I wrote it in Chinese. This may cause some trouble when you read it. If you think it is better to translate it into English, tell me and I will do it. My problem is: I need to research the curve of 培养水平. When I cha...
by lookingfor17
Fri Apr 16, 2010 7:48 pm
Forum: Vensim
Topic: looking for help--why the curves end up in different extremu
Replies: 6
Views: 4681

looking for help--why the curves end up in different extremu

I am a student in China. And I have learned a little about SD and Vensim. Now I am working for my paper and I want to build a SD model. After I ran my simulation model, I found something wrong. When I changed a rate, the S-shape curve seemed much higher or lower than the baserun. But these S-shape c...