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MathGroup Archive 2005

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Re: Variant of inner Product ...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56721] Re: [mg56683] Variant of inner Product ...
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Thu, 5 May 2005 06:01:07 -0400 (EDT)
  • References: <200505040432.AAA06099@smc.vnet.net>
  • Reply-to: Chris Chiasson <chris.chiasson at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

A = {1, 2, 3}; B = {{a, b}, {c, d}, {r, s}};
MapThread[f, {A, B}]

On 5/4/05, =?ISO-8859-1?Q?Detlef_M=FCller?= at smc.vnet.net
<=?ISO-8859-1?Q?Detlef_M=FCller?= at smc.vnet.net> wrote:
> 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
> 
> 


-- 
Chris Chiasson
http://chrischiasson.com/
1 (810) 265-3161


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