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G P Nason (masgpn@sunlab1.bath.ac.uk) wrote:
: 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