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