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[Bug-apl] ¯4 ⎕DLX


From: Juergen Sauermann
Subject: [Bug-apl] ¯4 ⎕DLX
Date: Sat, 24 Dec 2016 17:57:06 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

Hi,

I have added ¯4 ⎕DLX B. It simplifies the presetting of values for a given constraints matrix B.
This can be useful, for example, for Sudokus to place the given digits into the contraints
matrix of an empty Sudoku.

The solving of Sudokus is now down to  around 5 lines of APL code (not counting comments,
formatting etc). See:

http://www.gnu.org/software/apl/Bits_and_Pieces/sudoku_DLX.html

/// Jürgen


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