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Re: NDSolve Question

• To: mathgroup at smc.vnet.net
• Subject: [mg86351] Re: NDSolve Question
• From: Szabolcs Horvát <szhorvat at gmail.com>
• Date: Sun, 9 Mar 2008 05:01:44 -0500 (EST)
• Organization: University of Bergen
• References: <fqtqmp$d82$1@smc.vnet.net>

David Park wrote:
> I found the answer, which is to use:
> 
> f[q_?NumberQ]:= ...
> 
> which prevents an initial evaluation.
> 

This should be

f[q_?NumericQ] := ...

because Pi or Sqrt[3] are not atomic numbers, but they are numerical 
quantities.  Of course if f[q] is *only* used with NDSolve, then it 
doesn't matter ...