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Re: Plot to Plot3D problem

  • To: mathgroup at
  • Subject: [mg83481] Re: Plot to Plot3D problem
  • From: Peter Pein <petsie at>
  • Date: Wed, 21 Nov 2007 02:57:12 -0500 (EST)
  • References: <fhp603$3bm$> <fhrr1t$535$> <fhu8bt$7lf$>

Jerry schrieb:
> One more question please: I see you use the expression
> (vo /. sol[10^lrf])[t] in Plot3D
> I've seen something like this before but I have no clue what 
> that extra [t] means. If I remove the [t] I get the same 
> error messages and a plot frame but with no plot in it. So 
> apparently it's something special for Plot3D? It's not 
> needed at all in Plot. I've never found any useful 
> explanation of [] in the Help.
> Peter Pein wrote:

>> sol[rf_] := First@NDSolve[eqs /. Rf -> rf, vo, {t, -10, 5}]

Well, NDSolve solves for the _function_ vo, not for the _value_ vo[t].
Thus vo/.sol[..] gives a function and (vo/.sol[])[t] is this function applied
to t.


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