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MathGroup Archive 2004

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Re: simple problem with Map?!?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49503] Re: simple problem with Map?!?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 22 Jul 2004 02:45:24 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <cdljfp$867$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

your lar operation fail because

a/(Plus @@ a) is  a/a for a atom

you mean

pppp = N[#/(Plus @@ #)] &[d0]

Regards
  Jens

Relishguy wrote:
> 
> I do not understand why the last evaluation ends up screwed:
> 
> In[1]:= d0 = {30,60,180,60,30};
> 
> In[2]:= tt = Plus @@ d0
> Out[2]= 360
> 
> In[3]:= 
> Out[3]= {0.0833333,0.166667,0.5,0.166667,0.0833333}
> 
> In[4]:= ppp = N[d0 / (Plus @@ d0)]
> Out[4]= {0.0833333,0.166667,0.5,0.166667,0.0833333}
> 
> In[5]:= pppp = N[# / (Plus @@ #)]& /@ d0
> Out[5]= {1.,1.,1.,1.,1.}
> 
> Can anyone explain this simply? Do I need Hold[] or Evaluate[] somewhere?
> 
> TIA.
> 
> Regards..


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