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MathGroup Archive 2006

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Re: Re: List of user-defined derivatives

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71682] Re: [mg71608] Re: List of user-defined derivatives
  • From: "Chris Chiasson" <chris at chiasson.name>
  • Date: Sun, 26 Nov 2006 03:49:18 -0500 (EST)
  • References: <200611231041.FAA25261@smc.vnet.net> <ek642v$91p$1@smc.vnet.net>

I guess I guessed incorrectly :-]

On 11/25/06, Peter Pein <petsie at dordos.net> wrote:
> Chris Chiasson schrieb:
> > they're probably stored in the DownValues of Derivative
> >
> > On 11/23/06, Andrew Moylan <andrew.j.moylan at gmail.com> wrote:
> >> Hi all,
> >>
> >> When the derivative of a function is specified like this:
> >>   f' = 6 &;
> >> or alternatively like this:
> >>   f'[x_] = 6;
> >> the definitions are not stored in UpValues[f] or DownValues[f]. I
> >> understand this is why Clear[f] doesn't clear definitions for
> >> derivatives. My question is: where are these definitions stored, and
> >> how can one obtain a list of user-defined derivatives such as this one?
> >>
> >> Cheers,
> >> Andrew
> >>
> >>
> >
> >
> They are in SubValues[Derivative] in the form
> HoldPattern[Derivative[1][f][x_]] :> 6
>
> P²
>
>


-- 
http://chris.chiasson.name/


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