🚀 go-pugleaf

Announcing...

***	WAVELET TRANSFORMS AND THRESHOLDING IN 1 AND 2 DIMENSIONS FOR S   ***
			Version 2.2

WHAT:	S software to compute the 1- and 2-dimensional wavelet transform
	using Mallat's pyramidal algorithm with Daubechies compactly supported
	orthonormal wavelets and incorporating an implementation of the
	thresholding ideas of Donoho and Johnstone.

	Package consists of:

		* S functions that compute the 1- and 2-dimensional
		  discrete wavelet transform, and inverse. (Uses
		  dynamically loaded C code)

		* S functions to perform thresholding

		* S functions to plot and interpret sets of wavelet coefficients

		* Full on-line S help

NEW IN RELEASE 2.2

		* extra method of boundary handling, periodic functions

                * new family of wavelets added, Daubechies' least-asymmetric
        
                * new function "draw" that produces nice pictures of 
                  one- and two dimensional wavelets

                * new class iwmdc added and facilities to automatically
                  compress thresholded image wavelet decomp. objects

                * improvements to Makefile and automatic dynamic loading.

	(Thanks to Peter Clifford, Howard Grubb, and Martin Maechler for
        providing suggestions and improvements for wavethresh 2.2)


WHERE:	Obtain via anonymous FTP from

		gdr.bath.ac.uk

	Userid "anonymous" and your email address as the password.
	Software is in directory /pub/masgpn as the file "wavethresh2.2.Z"
	The transfer should be done using the BINARY transfer mode of ftp
	and then the files should be uncompressed using the UNIX command
	"uncompress". The software can then be unpacked by typing
	(on a UNIX machine)

		% sh wavethresh2.2

	Extra draft documentation is in "dws.ps.Z" - a compressed PostScript
	file (for Release 2.1).

***>	FOR RELEASE 2.2 documentation contact Guy Nason directly at the
	address below.

	ALSO available from the statlib archive (ftp: lib.stat.cmu.edu)
	userid "statlib", your email address as password. The software
	is in the "S" directory as "wavethresh". 

CONTACT:	gpn@maths.bath.ac.uk for further information
---------------------------------------------------------------------

After Release 2.1 I received many questions along the lines of "what is S?".
The following information is culled from the S frequently asked questions
list and from the s-news digest.

WHAT ARE S & SPlus?
+++++++++++++++++++

From the Frequently asked questions (FAQ) list:

4)   What is S? What can S be used for?

     S is a very high level language and  an  environment  for  data
     analysis  and  graphics.  S was written by Richard A. Becker, 
     John M. Chambers, and Allan R. Wilks of AT&T Bell Laboratories
     Statistics Research Department.  More recently, other Bell Labs
     researchers have made major contributions to a new modeling
     capability in S.
  
     The S language is the form in which S users express their 
     computations.  The environment provides facilities  for data
     management, support for many graphics devices, etc.
   
     S is useful for computation in a wide  range  of  applications.
     It's  a  very  general  tool, so that applications are not res-
     tricted to any particular subject area.  One way to think of it
     is  to  imagine the wide range of applications that can be han-
     dled by a spreadsheet program - but think of  an  even  broader
     range  of applications because S is much more flexible for com-
     plex computations.  As examples, S has been used for  computing
     in business, finance, experimental science, etc.

     The authors of S prefer that you not call S a statistics package.  
     Most of  the  people who  use  S have no attachment to statistics,
     and most of the S applications involve basic quantitative 
     computations and graphics.   ``Package'' really doesn't apply well 
     to S, either.  The word ``package'' often connotes a collection
     of unrelated tools put  together under one name; this is unlike S,
     where all functions are tightly integrated and controlled by the 
     S language.

6)   What is S-PLUS?  What does it have that S doesn't?

     S-PLUS is a cleverly-named version of S sold by  Statisti-
     cal  Sciences,  Inc.  It contains various extensions to S added
     by StatSci, is supported, and has a large installed  base.   It
     tends  to  track  the latest AT&T release, but it is not ``more
     recent'' than S itself.  StatSci was founded by Douglas Martin.
     One can use S-PLUS to do all that one does in S.

     The major areas in which S-PLUS extends S are time-series, survival
     analysis, `modern regression' (including LMS regression and
     projection pursuit regression), classical statistical tests, 
     graphical device drivers and dynamic loading.

From the s-news digest (8 Jun 1993; digest107):

	...Information about the S Language Software and S-PLUS can be obtained
from StatSci sales, 1700 Westlake Avenue North, Suite 500, Seattle, Washington
98109, by telephoning 1-800-569-0123 (North America), or 1-206-283-8802;
FAXING 1-206-283-8691; or by using Internet Email at mktg@statsci.com.
StatSci also offers a free instructional video explaining advanced, modern
data analysis using S-PLUS Software...
-- 
Guy Nason
Statistics Group
School of Mathematical Sciences
University of Bath