Ventana software support forum

Hi there! Thank you for spending time on this. The model here states that it is missing a vdf file and therefore I cannot simulate it. http://www.vensim.com/documentation/index.html?fn_cumulate.htm Essentially, the model I am using is this one attached. I doubt that there could be an error in it, as...

Here is the file I am using as input, and its output with a 0.25 timestep. There are two stocks accumulating equally so the result should be the input divided by two. As you can see from the closer screen shot the result is wrong. If timestep is set to 1 then the output is as it should.

Hi!

Thank you for relying. In the end, I believe it is a timestep issue. The model was accumulating in one stock based on time that was written in decimal form whereas for the other time didn't contain decimal points (e.g., 2010 for one stock, 2010.5 for the other stock).

Hello! I have a stock which is accumulating data. When this data is constant, the stock is normally showing the data accumulation per year. However, when I read some non-constant data per year from a csv file, the accumulation is not accurate. Could it be an integration function issue? Any ideas? Th...

Hi!

For the networke model of chapter 10, in this part that is shown in the attachment, how can I add an additional variable, named "Product 3 Share of Installed Base" for example, with a pre-specified share of the installed base for each time step?

Thanks!

Hey there! Thank you for your replies. I am on a Mac, however... What I was doing so far was selecting and copying the model with the model with command-A, command-C, pasting it to Preview, and exporting to pdf from there. But it seems that the resolution could be somehow better... Could it? Any fur...

Hey there!

I was wondering, does it seem reasonable to have a model containing only reinforcing loops?

Is a balancing loop always necessary? And if not, why?

Thanks!

Hey there!

What would be the best way to export the models to pdf?

Or, to state it better, what would be the recommended way to turn the models in .eps images for optimal resolution?

Thanks!

To be more specific, in the NETWORKE.mdl model of Chapter 10 that can be found in the VENSIMMO.zip here: http://www.mhhe.com/business/opsci/sterman/models.mhtml the Total Demand variable is a constant number. I would like to give specific values for each time step as described. I change the Type of ...

I am trying a lookup, but then I receive an error for the variables that it points to: "... is a special type and cannot be used as a normal variable".

So what I need is to output one value from the lookup for each time iteration as far as I understand.

Thanks for the reply!

They are not saved in a file. I would just like to add them manually.

Hello!

Newbie question perhaps: How can I set specific values in a variable for each time step?

So let's say 10 specific values, for an initial time of 1, final time of 10, and time step of 1.

Thank you in advance!