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Re: D attributes

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27752] Re: D attributes
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 14 Mar 2001 04:06:50 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <98knl3$pnd@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

perhaps it has somwhere the definition

D[l_List,arg_]:=D[#,arg] & /@ l

??

Listable can't provide a definition:
"Listable with respect to the first argument."

or 
  "Listable with respect to the 22th argument."

Regards
  Jens

Arturas Acus wrote:
> 
> Dear Group,
> 
> This is very simple question.
> What is the D function mechanism which let it
> to go inside lists. See example
> 
> In[1]:=
> $Version
> Out[1]=
> "4.0 for Linux (April 21, 1999)"
> 
> In[2]:=
> Attributes[D]
> Out[2]=
> {Protected, ReadProtected}
> 
> In[3]:=
> D[{x, y, {x}}, x]
> Out[3]=
> {1, 0, {1}}
> 
> Why it goes inside lists if there is no Listable
> attribute? The same test is true for 4.1 also.
> 
> Sincerely, Arturas
> 
> 
> Dr. Arturas Acus
> Institute of Theoretical
> Physics and Astronomy
> Gostauto 12, 2600,Vilnius
> Lithuania
> 
> E-mail: acus at itpa.lt
>    Fax: 370-2-225361
>    Tel: 370-2-612906


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