I used the Vensim demo app, and when I tried to build the rabbit population model, I ran into a problem, as shown below. Can you help me out? Thank you very much.
the level type,used Equations INTEG has errors shown below:
Errors:Unable to understand the right hand side of this equation.
Vensim version: Vensim PLE for Windows Version7.0 Limited Time Evaluation
INTEG:Unable to understand the right hand side of this equation
INTEG:Unable to understand the right hand side of this equation
- Attachments
-
- rabbit_test.mdl
- (2.06 KiB) Downloaded 339 times
-
- Super Administrator
- Posts: 4573
- Joined: Wed Mar 05, 2003 3:10 am
Re: INTEG:Unable to understand the right hand side of this equation
Draw arrows from "births" to "population" and from "deaths" to "population", it should now be ok.
Advice to posters seeking help (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Units are important!
http://www.bbc.co.uk/news/magazine-27509559
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Units are important!
http://www.bbc.co.uk/news/magazine-27509559
Re: INTEG:Unable to understand the right hand side of this equation
Thank you very much.According to your method, the problem of horizontal variables population is solved, but the new problem is that the variable "births" is bad ,it's need population in the formula.
I refer to this site for example :https://www.vensim.com/documentation/Mo ... sample.htm
I refer to this site for example :https://www.vensim.com/documentation/Mo ... sample.htm
-
- Super Administrator
- Posts: 4573
- Joined: Wed Mar 05, 2003 3:10 am
Re: INTEG:Unable to understand the right hand side of this equation
I'm not sure what the problem is, the model I've attached runs fine for me.
Advice to posters seeking help (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Units are important!
http://www.bbc.co.uk/news/magazine-27509559
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Units are important!
http://www.bbc.co.uk/news/magazine-27509559
Re: INTEG:Unable to understand the right hand side of this equation
That's OK, thank you very much.I just got it wrong,thank you.