NDSolve Question

*To*: mathgroup at smc.vnet.net*Subject*: [mg86328] NDSolve Question*From*: "David Park" <djmpark at comcast.net>*Date*: Sat, 8 Mar 2008 05:44:14 -0500 (EST)

Suppose I have a system like the following: f[q_]= some function with side affects NDSolve[{x'[t]==f[x[t]], x[0]==0},{x},{t, 0, 1}] My problem is that f[x[t]] seems to be evaluated before NDSolve starts solving the equations and hence the routines always use the initially evaluated form. I would like to have f[x[t]] to not be initially evaluated. Is that possible with NDSolve? Is there any particular Method or Option that can control the initial evaluation? -- David Park djmpark at comcast.net http://home.comcast.net/~djmpark/