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MathGroup Archive 2004

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RE : Sum of list elements

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49316] RE : [mg49313] Sum of list elements
  • From: "Florian Jaccard" <florian.jaccard at eiaj.ch>
  • Date: Tue, 13 Jul 2004 05:54:06 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Is this what you want ?

In[193]:=
liste={2,2,1};

In[195]:=
Plus@@liste

Out[195]=
5

In[196]:=
1/Plus@@liste*liste

Out[196]=
{2/5, 2/5, 1/5}

Meilleures salutations
 
F.Jaccard

-----Message d'origine-----
De : Per Rønne [mailto:spam at husumtoften.invalid] 
Envoyé : mardi, 13. juillet 2004 10:33
À : mathgroup at smc.vnet.net
Objet : [mg49313] Sum of list elements

I'm trying to find a function [possibly a way to make a function] which
calculate the sum of the elements of a list.

Right now, the purpose is to find the relative distribution of the
elements of a list. That is, I need a way to get out that the
distribution of:

{2, 2, 1}

is

{2/5, 2/5, 1/5}.

Had I been able to get the sum of the list elements in this way:

Sum[{2, 2, 1}]

it could had been done with:

l = {2, 2, 1}
l / Sum[l]

-- 
Per Erik Rønne




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