NDSolve

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg388] NDSolve*From*: fink at acf4.NYU.EDU*Date*: Fri, 6 Jan 1995 15:19:44 -0500 (EST)

I've found a problem that NDSolve will resolve in Version 2.1, but returns error messages in 2.2. This involved equations of the form y'[x] == Exp[ (a+x)^2]. NDSolve[ { y'[x] == 9.212*10^-12 Exp[ -0.00692042 (x-20)^2] - c1 y[x] - 1 1 .004 Exp[ -0.00692042 ((x-20))^2] y[x], z'[x] == 1 1 .004 Exp[ -0.00692042 (x-20)^2] y[x] - 1 z[x], y[0] == 0, z[0] == 0 }, {y[x],z[x]}, {x,0,10000} ]/.{c1->.1} returned Power::infy: Infinite expression 1/0 encountered. twice. This worked in 2.1. Any idea why? Howard Fink