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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: [mg46067] Re: [mg46046] help for time series basic operations
  • From: "Ravinder Kumar B." <ravi at crest.ernet.in>
  • Date: Wed, 4 Feb 2004 02:29:36 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

> 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]

Just try the following:

 b = RotateLeft[a,1] - a;

I am sure there are many more ways to aceive it!

--
    Regards,                                   Feb 4
    Ravi


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