Re: sum the elements of a list
- To: mathgroup at smc.vnet.net
- Subject: [mg57664] Re: sum the elements of a list
- From: "Drago Ganic" <drago.ganic at in2.hr>
- Date: Fri, 3 Jun 2005 05:34:08 -0400 (EDT)
- References: <qp6me.4907$BR4.3152@news-server.bigpond.net.au> <d7dp5o$qbl$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi Morris, you can also use Total[ Divisors[28] ] ---> 56. Best regards, Drago Ganic "Jean-Marc Gulliet" <jeanmarc.gulliet at 9online.fr> wrote in message news:d7dp5o$qbl$1 at smc.vnet.net... > 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. >