Diff. Equations with "Changeable" Parameters

*To*: mathgroup at smc.vnet.net*Subject*: [mg51667] Diff. Equations with "Changeable" Parameters*From*: "Krunom Ilicevic" <krunom at hotmail.com>*Date*: Wed, 27 Oct 2004 23:44:48 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

I have solved diff. equations in this kind of a way: NDSolve[{x'[t]=y[t],y[0]=0}, {y'[t]=x+Sin[t]+c*y[t]},{x,y},{t,0,2Pi}] and parameter c was 1, but how to write this algorithm if c is: c=0, if y<=-1 c=1, if -1<y<1 c=2, if y>=1 How to include this variable parameter c in my NDSolve method? Thanks.

**Follow-Ups**:**Re: Diff. Equations with "Changeable" Parameters***From:*DrBob <drbob@bigfoot.com>