help for time series basic operations

*To*: mathgroup at smc.vnet.net*Subject*: [mg46046] help for time series basic operations*From*: "paolo" <tarpanelli at libero.it>*Date*: Tue, 3 Feb 2004 18:20:50 -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] Thanks Paolo Tarpanelli

**Follow-Ups**:**Re: help for time series basic operations***From:*János Löbb <janos.lobb@yale.edu>

**Re: help for time series basic operations***From:*Yasvir Tesiram <tesiramy@omrf.ouhsc.edu>