Re: Plot to Plot3D problem
- To: mathgroup at smc.vnet.net
- Subject: [mg83481] Re: Plot to Plot3D problem
- From: Peter Pein <petsie at dordos.net>
- Date: Wed, 21 Nov 2007 02:57:12 -0500 (EST)
- References: <fhp603$3bm$1@smc.vnet.net> <fhrr1t$535$1@smc.vnet.net> <fhu8bt$7lf$1@smc.vnet.net>
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.
Peter