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MathGroup Archive 2005

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Re: sum the elements of a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57500] Re: sum the elements of a list
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at 9online.fr>
  • Date: Sun, 29 May 2005 21:00:20 -0400 (EDT)
  • Organization: New York University
  • References: <qp6me.4907$BR4.3152@news-server.bigpond.net.au>
  • Reply-to: jmg336 at nyu.edu
  • Sender: owner-wri-mathgroup at wolfram.com

morris wrote:
> After I do Divisors[28], I wish to add the elements of the list. How is this 
> possible?
> 
> Thanks
> Morris 
> 
> 
Hi Morris,

To do that, you must replace the head "List" of the list of divisors of 
28 returned by the command Divisors[28] by the head "Plus" (or "Times" 
if you wanted the product of the divisors for example).

In[1]:= Divisors[28]

Out[1]= {1,2,4,7,14,28}

In[2]:= Plus@@%

Out[2]= 56

In[3]:= Plus@@Divisors[28]

Out[3]= 56

In[4]:= Apply[Plus,Divisors[28]]

Out[4]= 56

Best regards,
/J.M.


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