This is an R port of Trevor Hastie's principal.curve package which can
be found in the statlib archive.

Changes from original:

	replaced missing ylim.scale by own function

	changes in "periodic.lowess" and changes in the call of
	"periodic.lowess" in the subroutine "bias.correct.curve" 

	All changes are marked by a comment starting with AW. 

The latest version of this package can always be downloaded from any
CRAN mirror. The CRAN master site can be found at

        http://www.ci.tuwien.ac.at/R
        ftp://ftp.ci.tuwien.ac.at/pub/R


************************************************************************
*                          Andreas Weingessel                          *
************************************************************************
* Institut fr Statistik      *               Tel: (+43 1) 58801 10716 *
* Technische Universitt Wien *               Fax: (+43 1) 58801 10798 *
* Wiedner Hauptstr. 8-10/1071 *     Andreas.Weingessel@ci.tuwien.ac.at *
* A-1040 Wien, Austria        * http://www.ci.tuwien.ac.at/~weingessel *
************************************************************************

The address of Trevor Hastie is (according to the information provided
in the statlib package):

Trevor Hastie           trevor@research.att.com
1-908-582-5647          (FAX) 1-908-582-3340
rm 2C-261 AT&T Bell Labs, Murray Hill, NJ 07974

