Math::MatrixReal v1.4 http://leto.net/code/Math-MatrixReal/ Contents of this file: ---------------------- - Legal stuff - Requirements - What does it do - Preliminary steps for use with Perl prior to version 5.002 - How to install it - Version history - Credits - Final note Legal stuff: ------------ Copyright (c) 1996, 1997 by Steffen Beyer. 1999 by Rodolphe Ortalo. 2001 by Jonathan Leto. All rights reserved. This package is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Requirements: ------------- Perl version 5.000 or higher capable of "overloading" (overload.pm). What does it do: ---------------- Math::MatrixReal - Matrix of Reals Implements the data type "matrix of reals" (and consequently also "vector of reals") which can be used almost like any other basic Perl type thanks to OPERATOR OVERLOADING, i.e., $product = $matrix1 * $matrix2; does what you would like it to do (a matrix multiplication). Also features many important operations and methods: matrix norm, matrix transposition, matrix inverse, determinant of a matrix, order and numerical condition of a matrix, scalar product of vectors, vector product of vectors, vector length, projection of row and column vectors, a comfortable way for reading in a matrix from a file, the keyboard or your code, and many more. Allows to solve linear equation systems using an efficient algorithm known as "L-R-decomposition" and several approximative (iterative) methods. Features an implementation of Kleene's algorithm to compute the minimal costs for all paths in a graph with weighted edges (the "weights" being the costs associated with each edge). Allows to solve the eigensystem of a real symmetric matrix, using Householder transformation and QL decomposition. Preliminary steps for use with Perl prior to version 5.002: ----------------------------------------------------------- Edit the "Makefile.PL" file in this package and change the line 'VERSION_FROM' => 'MatrixReal.pm', to 'VERSION' => '1.5', How to install it: ------------------ Please unpack and build this package OUTSIDE the Perl source and distribution tree!! 1) Change directory to the directory that has been created by unpacking this package ("Math-MatrixReal-1.3/"). 2) Type "perl Makefile.PL". (Or whatever the name and path of your Perl 5 binary is) Alternatively you can type, e.g., "perl Makefile.PL PREFIX=/home/doe" to install the module in the home directory, e.g. John Doe... 3) Type "make". 3.5) Optionally, type "make test" to test the build and/or benchmark your system a little. 4) Type "make install". Version history: ---------------- Version 1.0 was the initial release. Version 1.1 fixed a bug in the "kleene()" method. Version 1.2 changed the "new()" and "new_from_string()" methods so that they don't fail anymore if an empty class name is given to them (instead, "Math::MatrixReal" is used as the default). The documentation of the "new_from_string()" method was also slightly changed because it had proven to be incomplete and misleading. Version 1.3 included the eigenvalues/eigenvectors computation methods, added by Rodolphe Ortalo. Some test/bench programs were added also, especially for these methods. Please see the CHANGES file for newer version history. Credits: -------- As always, many thanks to Andreas Koenig for his relentless support and efforts as upload manager of the CPAN! Also many thanks to Stu Smith for raising the questions concerning the "new_from_string()" method (whose documentation was mis- leading and incomplete)! Many thanks to Steffen Beyer himself for being very open to third-party additions. (Of course, this acknowledgment is due to Rodolphe. :-) Final note: ----------- Please send all comments/bugs/patches to Jonathan Leto , as I have taken over module maintainer-ship as of version 1.4. Original Final note: If you need any assistance or have any comments, problems, suggestions, findings, complaints, questions, insights, compliments or donations to give ;-) then please don't hesitate to send me a mail: sb@engelschall.com (Steffen Beyer) You can also contact me if you think it's relevant (e.g. especially for compliments or donations ;-)): ortalo@laas.fr (Rodolphe Ortalo) In fact I'd be glad if you could drop me an e-mail when you are using this package, so I can see how much interest exists in it and how much time is reasonable to spend on its further development. Therefore, I would also be glad to know what you liked and what you disliked about this package! And I would also be very interested to know what your application is in which you found this package to be useful, just to get an idea what can all be done with it and in which direction it should be developed further. Many thanks in advance!!