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MathGroup Archive 2005

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Re: computing cumulative sum for list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54425] Re: computing cumulative sum for list
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Sun, 20 Feb 2005 00:09:38 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 2/19/05 at 2:32 AM, newsgroup at ziegenhagen.info (Uwe Ziegenhagen)
wrote:

>I would like to compute the cumulative sum for a list, but do not
>find the command.

>For

>{1,2,3,4,5}

>I would like to get

>{1,3,4,10,15}

In[1]=
Rest@FoldList[Plus, 0, Range@5]
Out[1]=
{1, 3, 6, 10, 15}

alternatively

In[2]:=
a = Range@5; 
FoldList[Plus, First@a, Rest@a]
Out[3]=
{1, 3, 6, 10, 15}
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