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MathGroup Archive 2006

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Re: List of user-defined derivatives

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71608] Re: List of user-defined derivatives
  • From: Peter Pein <petsie at dordos.net>
  • Date: Sat, 25 Nov 2006 05:36:45 -0500 (EST)
  • References: <200611231041.FAA25261@smc.vnet.net> <ek642v$91p$1@smc.vnet.net>

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


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