Ventana software support forum

Hi dear Vensim users,

I would like to calculate the sum over time. For example: I have a variable that states the amount of money spent on a project per time unit (year), sometimes more than initial, sometimes less (depending on the model). Now i would like to add each investments for each time to get the total amount spent on time x. Could anybody help me with a function for this? The function "Sum" is used with subscripts, but is that possible with "time"?

Thank you a lot.

All you need to sum over time is a level. The flow in is the amount of money spent.