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Re: Variant of inner Product ...

• To: mathgroup at smc.vnet.net
• Subject: [mg56735] Re: Variant of inner Product ...
• From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
• Date: Thu, 5 May 2005 06:01:18 -0400 (EDT)
• Organization: Uni Leipzig
• References: <d59jtg$69m$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

Inner[f, A, g @@@ B] /. g -> List

Regards

  Jens

"Detlef Müller" <=?ISO-8859-1?Q?Detlef_M=FCller?=> 
schrieb im Newsbeitrag 
news:d59jtg$69m$1 at smc.vnet.net...
> Hello,
>
> I have the following to do:
>
> Given
>
> In[1]:= A={1,2,3}; B={{a,b},{c,d},{r,s}};
>
> And a Function f, I like to have
>
> Out[2] = 
> {f[1,a],f[1,b]}+{f[2,c],f[2,d]}+{f[3,r],f[3,s]}
>
> The trial
>
> In[8]:=A={1,2,3}; B={{a,b},{c,d,e},{r,s}};
> In[9]:= Inner[f,A,B]
> Out[9]= f[1,{a,b}]+f[2,{c,d,e}]+f[3,{r,s}]
>
> looks promising,
> but if the Lists in B have the same length, 
> "Inner"
> makes something different:
>
> In[15]:=
> A={1,2,3}; B={{a,b},{c,d},{r,s}}; Inner[f,A,B]
>
> Out[16]= 
> {f[1,a]+f[2,c]+f[3,r],f[1,b]+f[2,d]+f[3,s]}
>
> So for now I have an ugly Table-Construction 
> doing the job,
> but I can't imagine there is no elegant and 
> clear solution
> for this ... any suggestions?
>
> Greetings,
>   Detlef
>