Ventana software support forum

I want to use the variable value of previous time periods , that is of (t-1) or (t-2) in the equation for time t.How do i do that
I will be very grateful if i could get help on this

I understand about delay fixed function, but it treats variable on left side as level variable.In my case, variable on left side is a auxiliary variable whose value is changing every time period.

Also, I am unable to use GET TIME VALUE function to know the current value of time. Vensim says that this function is not operable with this configuration.What option do I have other than above function to get the current time value.

Just use the time variable.

You just need to delay whatever it is on the right hand side of the equation that you need. But be careful.
http://metasd.com/2017/11/discrete-time-stinks/

Thanks @tomfid