[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: A new Sudoku xslt implementation (Was: Re:

Subject: Re: A new Sudoku xslt implementation (Was: Re: Sudoku - A solution in XSLT 2)
From: "Dimitre Novatchev" <dnovatchev@xxxxxxxxx>
Date: Sat, 11 Mar 2006 21:29:27 +1100
xslt sudoku
Hi Andrew,

> Hi Dimitre,
> I have made a couple of improvements to the version you used there - I
> found if you tackle the center cells first, followed by the top-middle
> group the time can be greatly reduced.
> I've also improved the test boards to be genuinely hard (taken from
> the newspaper :)
> Use this function instead of the old one to get a better result:

That's good news!

I tested your new stylesheet on the following "fiendish" board, and it
performs almost 5 times better than the previous one:


The results:

  AW1                                AW2

113016    14.8MB        24407    35MB

My results on this board are:

   6688    10MB

The fiendish board can be found here:


It's great you've started a blog!  Can you publish there some of the
most interesting and hardest board configuarations you're dealing


> <xsl:function name="fn:solveSudoku" as="xs:integer+">
>  <xsl:param name="startBoard" as="xs:integer+"/>
>  <!-- First process the center cells, then the top, then the rest of the
>      This should give better performance than starting top-left and
> working from there. -->
>  <xsl:variable name="theRest" select="for $x in 1 to 81 return
> $x[not($x = $center)][not($x = $topGroup)]" as="xs:integer+"/>
>  <xsl:variable name="emptyCells" select="for $x in ($center,
> $topGroup, $theRest) return if ($startBoard[$x] = 0) then $x else ()"
> as="xs:integer*"/>
>  <xsl:variable name="endBoard" select="fn:populateValues($startBoard,
> $emptyCells)" as="xs:integer*"/>
>  <xsl:choose>
>  <xsl:when test="empty($endBoard)">
>   <xsl:message>! Invalid board - The starting board is not
> correct</xsl:message>
>   <xsl:sequence select="$startBoard"/>
>  </xsl:when>
>  <xsl:otherwise>
>   <xsl:sequence select="$endBoard"/>
>  </xsl:otherwise>
>  </xsl:choose>
> </xsl:function>
> The entire stylesheet can be found at the blog I've started (yesterday):
> http://www.ajwelch.blogspot.com/
> cheers
> andrew

Dimitre Novatchev
A writer is a person for whom writing is more difficult than it is for
other people.

Current Thread


Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
First Name
Last Name
Subscribe in XML format
RSS 2.0
Atom 0.3
Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.