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..