Search found 17 matches
- Mon Oct 17, 2022 2:19 pm
- Forum: Vensim
- Topic: Unit errors
- Replies: 20
- Views: 3085
Re: Unit errors
Hi, I am still trying to run the Nitrogen cycle model, but I am facing some errors. I have a stock which is called "N uptake crop yield" and when I try to check the model it shows me an error saying that this stock is not used in the model. I am not sure how to deal with this pop-up messag...
- Thu Mar 31, 2022 6:38 am
- Forum: Vensim
- Topic: Unit errors
- Replies: 20
- Views: 3085
Re: Unit errors
Thank you very much for your help
Best regards
Best regards
- Wed Mar 30, 2022 3:50 pm
- Forum: Vensim
- Topic: Unit errors
- Replies: 20
- Views: 3085
Re: Unit errors
Thank you very much for your explanation. Actually, Time in the denitrification formula is indeed wrong because I added the Time variable myself in this formula --> "Denitrification = Soil NO3/ Time *(EXP(K den*"f (tem den)"*"f (teta den)"*Time))" to make fewer unit err...
- Tue Mar 29, 2022 2:06 pm
- Forum: Vensim
- Topic: Unit errors
- Replies: 20
- Views: 3085
Re: Unit errors
Dear Tom, I tried to correct unit errors as you suggested last time. Now I have far fewer unit errors than before but still, there are some small unit errors. Now I wanted to run my model, however, it keeps showing me a "Floating point error" message. I checked how to correct this error fr...
- Tue Feb 22, 2022 4:00 pm
- Forum: Vensim
- Topic: Unit errors
- Replies: 20
- Views: 3085
Re: Unit errors
Thank you very much for your help. I will try to fix it as you suggested.
Best regards
Best regards
- Mon Feb 14, 2022 11:41 am
- Forum: Vensim
- Topic: Unit errors
- Replies: 20
- Views: 3085
Re: Unit errors
In the model, I converted mm/day to L/(m*m)/Day by multiplying to 10^(-6)
- Mon Feb 14, 2022 11:25 am
- Forum: Vensim
- Topic: Unit errors
- Replies: 20
- Views: 3085
Re: Unit errors
Thank you for your help. Here I am attaching my model. I tried to work on the model unit consistency but still facing the same error issues. In my model, the stock is mainly soil layers and inputs/outputs are water and fertilizer. I am not sure how can I deal with the error in units. I checked the m...
- Fri Feb 11, 2022 2:06 pm
- Forum: Vensim
- Topic: Unit errors
- Replies: 20
- Views: 3085
Re: Unit errors
Thank you for your reply. You are indeed right, I think if I could correct one or two-unit errors then automatically other unit issues will be solved. However, I still could not figure out how I can do it. For example, I have a problem with units of inflows and outflows which are the inputs and outp...
- Wed Feb 09, 2022 3:32 pm
- Forum: Vensim
- Topic: Unit errors
- Replies: 20
- Views: 3085
Unit errors
Hi,
I am trying to work on errors in the unit but unfortunately, I could not eliminate them. If I solve one of the unit errors, the next one appears. I wanted to ask if I can run the model without specifying the units? Thanks
I am trying to work on errors in the unit but unfortunately, I could not eliminate them. If I solve one of the unit errors, the next one appears. I wanted to ask if I can run the model without specifying the units? Thanks
- Thu Feb 03, 2022 3:07 pm
- Forum: Vensim
- Topic: Model equations
- Replies: 1
- Views: 565
Model equations
Hi, I am going to put functions on my model but I am a bit hesitant if I am doing it correctly. As an example, I am attaching here a very simple model (which is a very small part of my model) and the equation function. So basically I am trying to put my equation function in the model but I am not su...
- Mon Jan 31, 2022 10:08 am
- Forum: Vensim
- Topic: Variables and shadow variables in Vensim
- Replies: 4
- Views: 1098
Re: Variables and shadow variables in Vensim
Thank you very much for your reply. In this model case, authors stated shadow variables as constant variables
- Fri Jan 28, 2022 4:22 pm
- Forum: Vensim
- Topic: Variables and shadow variables in Vensim
- Replies: 4
- Views: 1098
Variables and shadow variables in Vensim
Hi, I am going to replicate one of the existing system dynamics models created using Vensim. When I was reading the model I saw several shadow variables used in the model. To my understanding, shadow variables can be used if that variable was used in the model earlier and saved in the list of variab...
- Thu Jan 27, 2022 4:25 pm
- Forum: Vensim
- Topic: Variables and shadow variables in Vensim
- Replies: 4
- Views: 1098
Variables and shadow variables in Vensim
Hi, I am going to replicate one of the existing system dynamics models created using Vensim. When I was reading the model I saw several shadow variables used in the model. To my understanding, shadow variables can be used if that variable was used in the model earlier and saved in the list of variab...
- Tue Nov 23, 2021 10:33 am
- Forum: Vensim
- Topic: Error in functions and measurement units
- Replies: 8
- Views: 1968
Re: Error in functions and measurement units
Thank you very much for your explanation. I have tried both approaches. For the first approach you have suggested, I had to create a Time variable because otherwise, vensim kept showing me that the Time variable wasn't expected but used. I guess Vensim has a Time variable but it did not allow me to ...
- Mon Nov 22, 2021 4:34 pm
- Forum: Vensim
- Topic: Error in functions and measurement units
- Replies: 8
- Views: 1968
Re: Error in functions and measurement units
Here is my model. I have tried all the options but it still keeps showing me an error. Could you please suggest to me how to eliminate these errors? Thank you beforehand
- Mon Nov 22, 2021 11:25 am
- Forum: Vensim
- Topic: Error in functions and measurement units
- Replies: 8
- Views: 1968
Re: Error in functions and measurement units
Thank you very much for your help. I checked the units and they are in proper order. I would love to show my model but I am not sure how can I upload here my model. Below I am copying and pasting the errors that are appearing units check 1. Error in units for the following equation: #Soil temperatur...
- Fri Nov 19, 2021 3:30 pm
- Forum: Vensim
- Topic: Error in functions and measurement units
- Replies: 8
- Views: 1968
Error in functions and measurement units
Hi, I was trying to model the soil water dynamics. I gave the same measurement unit of cm/month for all the variables and stocks, but when I want to run it, the vensim doesn't run it and it keeps showing an error. When I opened the errors, it is most of the time about the measurement unit mismatch. ...