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MathGroup Archive 2004

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Re: help for time series basic operations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg46075] Re: help for time series basic operations
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 5 Feb 2004 04:02:54 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <bvpaq9$scp$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

ser = Table[a[i], {i, 1, 8}];

ListConvolve[{1, -1}, ser]

or

Subtract @@@ Reverse /@ Partition[ser, 2, 1]


Regards
  Jens

paolo wrote:
> 
> I am a quantitative analyst and for the first time i am using Mathematica. So, I
> am sorry if my question seem "very easy (almost stupid)" but i need some helps
> to begin to understand Mathematica
> 
> I have a time series
> a:=[a_1,a_2,a_3,a_4,...a_n]
> how can i do to subtract each element for the previous one?:
> 
> b:=[a_2 - a_1, a_3 - a_2, a_4 - a_3,.....,a_n - a_n-1]
> 
> Thanks
> 
> Paolo Tarpanelli


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