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Re: NDSolve Question

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  • Subject: [mg86357] Re: NDSolve Question
  • From: Jerry <Jer75811 at>
  • Date: Sun, 9 Mar 2008 05:03:12 -0500 (EST)
  • References: <fqtqmp$d82$>

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.

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