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.