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MathGroup Archive 2006

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Re: List of user-defined derivatives

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71665] Re: List of user-defined derivatives
  • From: "dimitris" <dimmechan at yahoo.com>
  • Date: Sun, 26 Nov 2006 03:48:47 -0500 (EST)
  • References: <200611231041.FAA25261@smc.vnet.net><ek97bg$fuk$1@smc.vnet.net>

Information["SubValues", LongForm -> True]

"SubValues[f] gives a list of transformation rules corresponding to all
subvalues (values for f[x,..][..], etc.) defined for \
the symbol f."

Attributes[SubValues] = {HoldAll, Protected}

Options[SubValues] = {Sort -> True}




Andrew Moylan wrote:
> Hi all,
>
> Since posting my message I discovered that these definitions are found
> in SubValues[Derivative]. As a side note, does anyone know why
> SubValues is largely undocumented, whereas UpValues and DownValues are
> documented?
>
> Cheers,
> Andrew
>
>
> On Nov 24, 5:39 pm, "Chris Chiasson" <c... at chiasson.name> wrote:
> > they're probably stored in the DownValues of Derivative
> >
> > On 11/23/06, Andrew Moylan <andrew.j.moy... 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--http://chris.chiasson.name/


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