Ventana software support forum

Hello, Question 1 I just wanted to verify something about the excel data that we input in the vensim model. If the excel column from which the model reads data, has about 400 rows worth of data, which values does the model show in the graph? does it take an average? for that particular month? Questi...

Thank you. I checked the equation and i think there was a syntax error.

the variable is "notification window" and its equation is made of "# days to deadline" and "client response"

Hi,

Can someone please tell me what the error "Character not valid for a variable name or number" mean?

I would really appreciate it.

Thanks.

Hi,

I wanted to know if there was a limit on the size of the equations to be written for a variable in vensim. I am using Vensim DSS. If I copy the equation and paste it in a word document, the equation comes up to be 3 pages long in a 10 point font. Please advice.

Thank you.

I will try and play with the equation to fix the error.

I tried and I still get an error. I am attaching a file with the equation. Could you please take a look at it and let me know what the problem is?

Is it possible to use the (:AND:) and/or (:OR:) in the 'IF' partof an IF THEN ELSE statement? I am getting errors. Please let me know. I cannot find much in the vensim manuals.

Thanks.

Hi, In the model that I am making, one of the variables has to read data from excel (constants). In the equation I have added the GET XLS CONSTANTS'filename.xls','sheetname', 'column name'), but when I try to run the simulation or partial simulation, I get an error saying "Unable to get constan...

Thanks Lee,

I figured out what to do, to get the values that i need.

Thank you for your help. If that is the case with stocks and flows, is it possible or is there a way so as not to include the previous value of the stock to the current one and just have the difference of the flows?

Hi,

Thanks Bob for the previous reply. It versions started showing the same results all by themselves. if i ever do have a problem again, I will post the model.

Bob, I am having problems with the results that Vensim shows for the stocks. for some reason instead of simply subtracting the outflow from mthe inflow to give the values for the stock, the results i get are that it adds up the inflow, outflow and the stcock value for the previous month and shows it...

Hello everyone, I have been trying to run a simulation, but i get different graphs/results in PLE and DSS. What is seen as a proper graph to the equations in PLE is seen as a straight line in DSS. Is it possible for this to happen? If so, how can I make the DSS version display the right graph. I hav...

Thank you.

Hello,

I wanted to know if there is a formula or equation or a way where the equation of a variable in vensim is such that it will take the value from a table in an excel spreadsheet?

I would really appreciate any help.

Thanks

For a particular variable, I have an equation. According to that equation the value of the variable becomes negative over time. How do I specify in the equation editor that it should show 0 for any values less than 0?

Thank you Bob. I also had a question about linking the different pages. I have read more of the DSS reference supplement, accordingly I have created windows for the main menu, model structure, scenario set-up. these Venapp pages run well on their own, but I don't know how to link these pages togethe...

Thank you Bob. I also had a question about linking the different pages. I have read more of the DSS reference supplement, accordingly I have created windows for the main menu, model structure, scenario set-up. these Venapp pages run well on their own, but I don't know how to link these pages togethe...

I'm trying to create windows in Venapp and I came across this command for a button. Can someone tell me what the "Ss" and "" stand for in the command shown below? or which part of the control definition window do they belong? BUTTON,"Scenario based on model constants",5...

Is it possible to show multiple graphs ( selected graphs important in the presentation) in a same window, something like a dashboard, where all the changes that you make in the model will in-turn be seen in these graphs in the window?

Thank you . it worked.

I used the step function to show an increment of 620 every month, but it seems to just show me a value of 620 every month and not an increment. in the function i've used an initial value of 3800 and then a step funtion of STEP(620, 1)... is there a way to show an increment of 620 and not just 620 ev...

i created a model in vensim and ran the simulation. it then gives me a .vdf file. how do i view it? if i try to open the file, it asks me to select appropriate program from list. and if i open it in vensim then it gives me a blank screen.

[Edited on 1-25-2006 by LBD]