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