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MathGroup Archive 1998

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Re:Help please: Summing a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13515] Re:[mg13480] Help please: Summing a list
  • From: Tomas Gargz <tgarza at mail.internet.com.mx>
  • Date: Fri, 31 Jul 1998 04:33:29 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

robpeterson at iname.com wrote:

>I make a list of numbers, eg:

>P=Table[6,{x,0,110}]; (I have a more interesting list to use later if I
>get this working)

>Now I want to make another list PP in which each entry PP[[i]] is the
>sum of P's first i entries.  I try

>PP[[i]]:=Sum[P[[n]],{n,0,i}];

Rob:

Try FoldList[Plus, 0, P]

Alternatively, the Standard AddOn Statistics DataManipulation has a
function CumulativeSums.

Good luck

Tomas Garza
Mexico City


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