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NDSolve problem with switching equations

• To: mathgroup at smc.vnet.net
• Subject: [mg106163] NDSolve problem with switching equations
• From: Haibo Min <haibo.min at gmail.com>
• Date: Sun, 3 Jan 2010 03:42:43 -0500 (EST)

Hello, everyone.

I am trying to solve a switching ND problem using NDSolve. Specifically,
suppose the system equation is

y1'[t]==y2;
y2'[t]==1000(1-y1^2)y2-y1;

y1(0)==0;y2(0)==1;

Then every half a second (0.5s), the system equation transforms to

 y1'[t]==y2;
y2'[t]==1000(1+y1^2)y2;

and then, after 0.5s, it transforms back again.

How to address this problem?

Thank you!

haibo

• Follow-Ups:
  • Re: Re: NDSolve problem with switching
    • From: DrMajorBob <btreat1@austin.rr.com>
  • Re: NDSolve problem with switching equations
    • From: Haibo Min <haibo.min@gmail.com>
  • Re: NDSolve problem with switching equations
    • From: DrMajorBob <btreat1@austin.rr.com>