MathGroup Archive 2000

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Correlation function and data

  • To: mathgroup at
  • Subject: [mg24748] Re: Correlation function and data
  • From: "Deborah Leddon " <Dleddon at>
  • Date: Wed, 9 Aug 2000 02:31:56 -0400 (EDT)
  • Organization: University of North Texas
  • Sender: owner-wri-mathgroup at

 I am trying to construct an autocorrelation function that can be 
applied to a data set as follows;

c[y_]:= Sum[(data[[i]] - Mean[data] )* ( data[[i+y]] - Mean[data])/
		Variance[data], {i,1,n - y}];
corrfunction = Array[c, {n - 1}];

ListPlot[corrfunction, PlotJoined->True]

Problem is , this routine works well for data sets up to a length of 
300 points, but gets unusually long for larger data sets , say 
around 1000-3000 points in length. I've tried  "Map" (using 
anonymous function rules), Table-Evaluate, etc..

Anyone got any ideas? I would much appreciate them!

Deb L.

  • Prev by Date: Re: CleanSlate
  • Next by Date: Re: A Functional Programming Question
  • Previous by thread: Re: postscript
  • Next by thread: Re: Re: Correlation function and data