i started learing SD just some weeks ago, so i have many questions about it.
so , what is the meaning of "integ"funtion in the vensim?
what is the meaning of "integ"
bathtub volume of water = INTEG( net flow into tub , inital tub volume of water)
If the tub is empty at start then initial level = 0 , if faucet is shut and drain plug is in; net flow = 0. Open faucet and tub fills at net flow rate, open the drain at the same time and the net flow into tub = inflow from faucet and outflow from open drain plug. Take a course in calculus to learn the underlying math. There are more analytic details that a course in numerical methods will bring to light as well. The Vensim manual explains all this well.
[Edited on 4-27-2009 by mike]
If the tub is empty at start then initial level = 0 , if faucet is shut and drain plug is in; net flow = 0. Open faucet and tub fills at net flow rate, open the drain at the same time and the net flow into tub = inflow from faucet and outflow from open drain plug. Take a course in calculus to learn the underlying math. There are more analytic details that a course in numerical methods will bring to light as well. The Vensim manual explains all this well.
[Edited on 4-27-2009 by mike]