I'm a PhD student and I'm working with covariance function. I'm interested to know if exist some packages in R to calculate and plot the bidimensional Autocovariance Function. the input matrix is a matrix that describe a spatial location over a 2-D space and I want to use it in the same way I can use a time serie in the 1-D acf. Thanks, Nicola. ================================================================Dr. Nicola Marchetti Phone: +39 0532 291331 Chemistry Department Fax: +39 0532 240709 University of Ferrara Luigi Borsari, 46 I-44100 Ferrara ITALY -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-announce mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-announce-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Dear Nicola Your mail seems to have gone wrong - it went to R-announce instead of R-help. In the third issue of R-news (see http://cran.r-project.org/doc/Rnews) there a nice article by Roger Bivand on spatial data analysis using R. See also the second issue of R-news, the article by Ripley and the presentation of package geoR. Use a function to calculte the empirical variogram (for instance function variog in package geoR). Using the empirical variogram is more stable than using the empirical covariance function. Cheers Ole nicola marchetti wrote:> > I'm a PhD student and I'm working with covariance function. I'm interested > to know if exist some packages in R to calculate and plot the > bidimensional Autocovariance Function. the input matrix is a matrix that > describe a spatial location over a 2-D space and I want to use it in the > same way I can use a time serie in the 1-D acf. > Thanks, > Nicola. > > ================================================================> Dr. Nicola Marchetti Phone: +39 0532 291331 > Chemistry Department Fax: +39 0532 240709 > University of Ferrara > Luigi Borsari, 46 > I-44100 Ferrara > ITALY > > -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- > r-announce mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html > Send "info", "help", or "[un]subscribe" > (in the "body", not the subject !) To: r-announce-request at stat.math.ethz.ch > _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._-- Ole F. Christensen Department of Mathematics and Statistics Fylde College, Lancaster University Lancaster, LA1 4YF, England -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Hi, I think the functions: correlogram and variogram in package 'spatial' could do the task Antonio ----- Mensaje Original ----- Remitente: nicola marchetti <nicola at chim252.unife.it> Fecha: Jueves, Abril 11, 2002 11:09 am Asunto: new acf package> > I'm a PhD student and I'm working with covariance function. I'm > interestedto know if exist some packages in R to calculate and > plot the > bidimensional Autocovariance Function. the input matrix is a > matrix that > describe a spatial location over a 2-D space and I want to use it > in the > same way I can use a time serie in the 1-D acf. > Thanks, > Nicola. > > > > ================================================================> Dr. Nicola Marchetti Phone: +39 0532 291331 > Chemistry Department Fax: +39 0532 240709 > University of Ferrara > Luigi Borsari, 46 > I-44100 Ferrara > ITALY > > -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- > .-.-.-.-.-.- > r-announce mailing list -- Read > http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html > Send "info", "help", or "[un]subscribe" > (in the "body", not the subject !) To: r-announce- >request at stat.math.ethz.ch_._._._._._._._._._._._._._._._._._._._._._._._ ._._._._._._._._._._._._._._._._>-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
You should better use a variogram for this: have a look at the package "spatial" which by the way also contains a function "correlogram", which is what you asked for. You have also the variogram in the package "sgeostat". Hans nicola marchetti writes: > > I'm a PhD student and I'm working with covariance function. I'm interested > to know if exist some packages in R to calculate and plot the > bidimensional Autocovariance Function. the input matrix is a matrix that > describe a spatial location over a 2-D space and I want to use it in the > same way I can use a time serie in the 1-D acf. > Thanks, > Nicola. > > > > ================================================================ > Dr. Nicola Marchetti Phone: +39 0532 291331 > Chemistry Department Fax: +39 0532 240709 > University of Ferrara > Luigi Borsari, 46 > I-44100 Ferrara > ITALY > -- Hans Wackernagel ___________________________________________________ Centre de G?ostatistique 35, rue Saint Honor? Ecole des Mines de Paris F - 77305 Fontainebleau Phone: +33-1.64.69.47.60 Fax: +33-1.64.69.47.05 http://cg.ensmp.fr/~hans wackernagel at cg.ensmp.fr ___________________________________________________ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._