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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