Integration over a time-invariant variable
Posted: Wed Oct 10, 2018 4:47 pm
Hi,
Is there any way to do integration over a variable that is not related to TIME STEP, i.e. time-invariant? For example, P(mu) is a probability density function of mu where mu is the time-invariant variable which has a predefined range, say, 1 to 10. Now I want to integrate variable A over the distribution of mu, in order to get variable B. Variable A is a function of mu and other variables.
Variable B = INTEG Variable A * P(mu) d mu
I guess the first step is to normalize P(mu), and then do the integration.
How to realize this in Vensim? I checked LOOKUP AREA example but it appears somewhere in the model setup the TIME has to be involved. Maybe subscript is the way out?
Many thanks.
Is there any way to do integration over a variable that is not related to TIME STEP, i.e. time-invariant? For example, P(mu) is a probability density function of mu where mu is the time-invariant variable which has a predefined range, say, 1 to 10. Now I want to integrate variable A over the distribution of mu, in order to get variable B. Variable A is a function of mu and other variables.
Variable B = INTEG Variable A * P(mu) d mu
I guess the first step is to normalize P(mu), and then do the integration.
How to realize this in Vensim? I checked LOOKUP AREA example but it appears somewhere in the model setup the TIME has to be involved. Maybe subscript is the way out?
Many thanks.