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MathGroup Archive 2006

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Re: trivial question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69804] Re: trivial question
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sat, 23 Sep 2006 06:14:46 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <ef2tn1$mnf$1@smc.vnet.net>

dimmechan at yahoo.com wrote:
> Hi.
> 
> I think this is rather trivial, but I can think something right now.
> 
> Why the commands below result in different output?
> 
> (HoldForm[+##1]&)@@list
> 1+2+3
> 
> HoldForm[Plus]@@list
> Plus[1,2,3]
> 
> Thanks in advance.
> 

In[1]:=
list={1,2,3};

In[2]:=
(HoldForm[+##1]&)@@list//Trace

Out[2]=
{{list,{1,2,3}},(+##1&)@@{1,2,3},(+##1&)[1,2,3],1+2+3}

In[3]:=
HoldForm[Plus]@@list//Trace

Out[3]=
{{list,{1,2,3}},Plus@@{1,2,3},Plus[1,2,3]}

Regards,
Jean-Marc


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