Hi all,
I'm new in using Vensim, and I have a problem with the pulse.
If I want to set one randomly demand every 24 hours, how should I do?
Random Pulse
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bob@vensim.com
- Senior Member
- Posts: 1107
- Joined: Wed Mar 12, 2003 2:46 pm
If you want a random demand quantity every 24 hours use
IF THEN ELSE(MODULO(Time,Time Units Per Day) < Time Step/2,random demand quantity,0)
If you want a random demand with an average time between demands of 24 hours use
demand = RANDOM POISSON(0,1e9,mean demand rate,0,1,0)
mean demand rate=1/24 ~ Part/Hour
this assumes the model is in hours - note RANDOM POISSON only makes sense for difference equations.
IF THEN ELSE(MODULO(Time,Time Units Per Day) < Time Step/2,random demand quantity,0)
If you want a random demand with an average time between demands of 24 hours use
demand = RANDOM POISSON(0,1e9,mean demand rate,0,1,0)
mean demand rate=1/24 ~ Part/Hour
this assumes the model is in hours - note RANDOM POISSON only makes sense for difference equations.