Re: time serie -> sum inside a loop
- To: mathgroup at smc.vnet.net
- Subject: [mg46238] Re: time serie -> sum inside a loop
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 12 Feb 2004 07:16:03 -0500 (EST)
- Organization: Universitaet Leipzig
- References: <bvvneh$j53$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
y[a_List, i_Integer?Positive] :=
With[{mean = Tr[a]/Length[a]}, Tr[Take[a, i] - mean]]
Regards
Jens
paolo wrote:
>
> Given a time serie
> a:= {a[[1]],a[[2]],a[[3]],...,a[[n]]}
>
> how can i solve this loop with mathematica?
>
> -------------
> Y[[i]]:=Sum_(for k=1 to i) [a[[k]]-mu]
> -------------
>
> where mu is the mean of time serie a.
>
> thanks
>
> Paolo Tarpanelli