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 ...