waveforms

[ETNC(SS)]

I am using Vensim PLE and am wondering about the best approach to modeling various waveform inputs to a model, such as a square wave, sawtooth wave, sine wave. I admit I am new to Vensim, but so far I have not had any success trying multiple STEP functions or IF THEN ELSE logic.

Any and all advice is more than welcome....

Thanks in advance!

[bob@vensim.com]

For a sinusoid use SIN(Time/period*6.28) (you will need to add Time to the view as a shadow variable and connect it to your variable). For a square wave use something like PULSE TRAIN(0,10,20,100). For a sawtooth you probably need something like

var = MODULO(Time,Period)*amplitude/period

[ETNC(SS)]

Bob,

Thank you very much for the suggestions, and I will experiment with them.

I seem to have few problems modeling fluid systems, but electrical systems have proven more difficult!

Cheers,

ETNC(SS)