Re: NDSolve Question

*To*: mathgroup at smc.vnet.net*Subject*: [mg86357] Re: NDSolve Question*From*: Jerry <Jer75811 at yahoo.com>*Date*: Sun, 9 Mar 2008 05:03:12 -0500 (EST)*References*: <fqtqmp$d82$1@smc.vnet.net>

Sir, I tried this and I only get plot axes, no graph. f[q_?NumberQ] := q sol = NDSolve[{x'[t] == f[x[t]], x[0] == 0}, {x}, {t, 0, 1}] Plot[x[t] /. sol, {t, 0, 1}] In place of {x} in sol I tried x and x[t] with no change. In Plot I tried x instead of x[t], no help. Can you give me a successful example? Thanks. David Park wrote: > I found the answer, which is to use: > > f[q_?NumberQ]:= ... > > which prevents an initial evaluation. >