Revision history for Algorithm-Combinatorics

0.26 Jan 28 2011

• Fixes a memory leak in subsets(), thanks to Oliver Seeliger. [closes RT#65207]
• Updates Copyright.
• README documents now the module itself, better for GitHub.

0.25 Nov 30 2007

• Improved speed of subsets() copying the algorithm in List::PowerSet.

0.24 Jul 14 2007

• Added subsets().

0.23 May 19 2007

• We do not longer assume indices com to XS as IVs, that broke partitions() in 5.6.2.
• Small touches to the code.
• Added a few tests.

0.22 May 15 2007

• The previous release was built with Apple's version of tar, which adds some custom extra files that prevent building the module in some systems. I built this one with GNU tar.

0.21 May 14 2007

• Added a directory with some benchmarks.
• A maintenance release to indicate the module is maintained.

0.20 June 6 2006

• Jumped version to 0.2x.
• Added pointer to Sloane's encyclopedia for the sequence of numbers of circular permutations
• Added complete_permutations().
• Simplified explanation of circular permutations.

0.16 June 5 2006

• Added circular_permutations().
• Added some pointers to The On-Line Encyclopedia of Integer Sequences
• Added a few more tests for partitions().

0.15 May 23 2006

• Added partitions().
• Added some comments.

0.14 December 19 2005

• Small rewordings in POD.
• Added TAOCP Vol 4, Fasc 3 to REFERENCES.
• Added tuples as alias to variations to add the nomenclature in Knuth's, Mathematica, etc. to the interface.
• Code cleanup.

0.13 November 20 2005

• Added derangements(), code, tests, and docs.
• Benchmarked permutations() against permutations() with loop variables declared as registers. No measurable difference.
• Removed "install" from the cpan(1) example in README.

0.12 November 13 2005

• DESCRIPTION was reworded.
• Refactored as regular XS-based module.

0.11 November 8 2005

• CPAN.pm does not resolve the dependency with Inline before Makefile.PL is executed, and it fails to generate the Makefile because the module Inline::MakeMaker is not found. Due to this ExtUtils::MakeMaker is back.

0.10 November 6 2005

• permutations() has been edited to match Algorithm L from [1]
• Added REFERENCES to POD
• Added a workaround to Makefile.PL for "No rule to make target ... needed by `pure_all'" so that the Makefile generated by Inline::MakeMaker's WriteInlineMakefile() works, and thus the C part behaves like a plain XS extension instead of generating caches on the user machine

0.08 November 6 2005

• Changed hyphens in test filenames with underscores
• The module is known to run under 5.6.2, so the corresponding use VERSION has been added
• variations(\@data, $k) is delegated to permutations(\@data) for @data == $k, since permutations() is more efficient
• Changed AV in signatures to SV plus a cast (SV*) SvRV(array) due to problems reported regarding AVPtrs. I copied the trick from the Changes of Digest::SHA. (Thanks to Aaron Dalton for reporting the problem.)
• variations() is much better, almost twice as fast and does not create SVs

0.07 November 5 2005

• Documented the corresponding formulas
• Slicing is done now in Perl. The code is much more clear and in my benchmarks no significant difference is measured
• The iterator now may receive an initial arrayref (this is private implementation), which simplifies the set up of the iterator when the first tuple is known

0.06 November 5 2005

• permutations() is about 3-4 times faster

0.05 November 4 2005

• Rewrote the test suite, and relevant documentation
• Added the helper module t/Tester.pm to factor out a common test code pattern
• If k is "out of natural range"" the empty set is returned and a warning is issued
• The iterators return an arrayref, and the implementation was revised accordingly to be mathematically correct in edge-cases and more forgiving
• I can't stand that DIAGNOSTICS::Errors section, so many croaks on boundary conditions are so unperlish! The module has just a couple of days so I am on time to fix this

0.02 November 3 2005

• README revised
• DEPENDENCIES added to POD
• DIAGNOSTICS added to POD
• VERSION added to POD
• Added some code documentation
• Minor tweaks on the XS code

0.01 November 2 2005

• First version, released on an unsuspecting world.