Updated version 3.1 of SOM_PAK

[Jari Kangas]

************************************************************************
*                                                                      *
*                              SOM_PAK                                 *
*                                                                      *
*                                The                                   *
*                                                                      *
*                        Self-Organizing Map                           *
*                                                                      *
*                          Program  Package                            *
*                                                                      *
*                    Version 3.1 (April 7, 1995)                       *
*                                                                      *
*                          Prepared by the                             *
*                    SOM Programming Team of the                       *
*                 Helsinki University of Technology                    *
*           Laboratory of Computer and Information Science             *
*                Rakentajanaukio 2 C, SF-02150 Espoo                   *
*                              FINLAND                                 *
*                                                                      *
*                       Copyright (c) 1992-1995                        *
*                                                                      *
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Updated public-domain programs for Self-Organizing Map (SOM) algorithms
are available via anonymous FTP on the Internet. 

A new book on SOM and LVQ (Learning Vector Quantization) has also
recently come out: Teuvo Kohonen. Self-Organizing Maps
(Springer Series in Information Sciences, Vol 30, 1995). 362 pp.
Price (hardcover only) USD 49.50 or DEM 98,-. ISBN 3-540-58600-8.

In short, Self-Organizing Map (SOM) defines a 'nonlinear projection'
of the probability density function of the high-dimensional input data
onto the two-dimensional display. SOM places a number of reference
vectors into an input data space to approximate to its data set in an
ordered fashion, and thus implements a kind of nonparametric,
nonlinear regression.

This package contains all necessary programs for the application
of Self-Organizing Map algorithms in an arbitrary complex data
visualization task.  

This code is distributed without charge on an "as is" basis.
There is no warranty of any kind by the authors or by Helsinki
University of Technology.

In the implementation of the SOM programs we have tried to use as
simple code as possible. Therefore the programs are supposed to
compile in various machines without any specific modifications made on
the code. All programs have been written in ANSI C. The programs are 
available in two archive formats, one for the UNIX-environment, the
other for MS-DOS. Both archives contain exactly the same files. 

These files can be accessed via FTP as follows:

1. Create an FTP connection from wherever you are to machine
   "cochlea.hut.fi". The internet address of this machine is 
   130.233.168.48, for those who need it.

2. Log in as user "anonymous" with your own e-mail address as password.  

3. Change remote directory to "/pub/som_pak". 

4. At this point FTP should be able to get a listing of files in this
   directory with DIR and fetch the ones you want with GET. (The exact 
   FTP commands you use depend on your local FTP program.) Remember 
   to use the binary transfer mode for compressed files.

The som_pak program package includes the following files:

  - Documentation:
      README             short description of the package 
                         and installation instructions
      som_doc.ps         documentation in (c) PostScript format
      som_doc.ps.Z       same as above but compressed
      som_doc.txt        documentation in ASCII format

  - Source file archives:
      som_p3r1.exe       Self-extracting MS-DOS archive file
      som_pak-3.1.tar    UNIX tape archive file
      som_pak-3.1.tar.Z  same as above but compressed


An example of FTP access is given below

unix> ftp cochlea.hut.fi (or 130.233.168.48)
Name: anonymous
Password: <your email address>
ftp> cd /pub/som_pak
ftp> binary
ftp> get som_pak-3.1.tar.Z
ftp> quit
unix> uncompress som_pak-3.1.tar.Z
unix> tar xvfo som_pak-3.1.tar

See file README for further installation instructions.

All comments concerning this package should be
addressed to som at cochlea.hut.fi.

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