NDSolve Encountered non-numerical value for a derivative at t=0

*To*: mathgroup at smc.vnet.net*Subject*: [mg131382] NDSolve Encountered non-numerical value for a derivative at t=0*From*: qiu zhanlong <comoq3c at gmail.com>*Date*: Wed, 17 Jul 2013 01:48:43 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net

hi folks, I have one coupled equations which the NDSolve fails at t=0 t x'[t]== -x[t]+y[t], t y'[t]== -5 t^2/x[t]^2+x[t]-y[t], x[0]=y[0],x[1]=1,{t, 0, 1} from the mathematica help center, there are 2 possible ways to resolve this problem, One possibility is to start at a small \[Epsilon]>0 instead of 0, the other one is Setting SolveDelayed->True will avoid the singularity in the solved form of the equations. But neither of them work for my equation. thanks for help