StoppingTest Constraints in NDSolve

*To*: mathgroup at smc.vnet.net*Subject*: [mg72845] StoppingTest Constraints in NDSolve*From*: Cham <martin465 at sympatico.ca>*Date*: Mon, 22 Jan 2007 03:55:09 -0500 (EST)

Hi, I'm using the NDSolve operation in Mathematica, and I need to add several constraints in the StoppingTest option. How should I do this ? More specifically, I want the iteration to stop if : (x[t] - 1)^2 + y[t]^2 + z[t]^2 < 0.5 and (x[t] + 2)^2 + y[t]^2 + z[t]^2 < 0.5 How to tell this in the StoppingTest option ?