On Wed, Apr 28, 2010 at 7:17 PM, Markus Flatscher
<markus(_dot_)flatscher(_at_)virginia(_dot_)edu> wrote:
Dear David,
Can you quickly point me to somewhere (just a list thread or something)
where your pet peeve about using xsl:variable with content is explained? At
my current learning stage, that would be very helpful to me, especially
since I do what I'm not supposed to do a lot, and I'd like to learn how to
do it better. Also, other than reading (and understanding) the specs, is
there any recommended reading you have for intermediate users of
XPath/XQuery/XSLT2? Or should we just keep re-reading Mr. Michael Kay?
Re: the 2nd part of this question:
Here is a link to a SO question I answered recently:
http://stackoverflow.com/questions/1858345/xsltwhich-is-the-best-tutorial-you-would-like-to-recommend/1926466#1926466
--
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
Thanks!
Markus
David Carlisle wrote:
On 28/04/2010 23:20, Florent Georges wrote:
David Carlisle wrote:
Hi,
You are making it pretty inefficient in any case by using
value-of (or relying on your xslt engine to optimise this away)
by using value-of you are asking for a document node with a
text node child
I didn't follow the whole discussion in details, so I probably
missed something, but why do you say "by using value-of you are
asking for a document node"? I thought it just created one text
node.
Regards,
er because it was the middle of the night and I'm so used to moaning at
people for using xsl:variable with content rather than a select attribute
that "document node with text node child" just slipped off my fingers,
sorry. (If you look at the saxon list you'll see that I hadn't woken up
enough this morning to notice my error:-)
but the main point is that it's really too hard to expect automatic
conversions from O(n^2) algorithms to O(log n). My own attempt was the
following which I'd hoped would beat dimitre's for speed, but it doesn't
consistently, and his has the advantage of using exact integer arithmetic (I
didn't do the analysis to see at what the point the following will succumb
to rounding error)
<xsl:function name="ex:pow" as="xs:decimal">
<xsl:param name="a" as="xs:decimal"/>
<xsl:param name="n" as="xs:integer"/>
<xsl:choose>
<xsl:when test="$n=0">
<xsl:sequence select="1"/>
</xsl:when>
<xsl:when test="$n=1">
<xsl:sequence select="$a"/>
</xsl:when>
<xsl:when test="$n mod 2 = 0">
<xsl:sequence select="for $z in ex:pow($a,$n idiv 2) return $z*$z"/>
</xsl:when>
<xsl:otherwise>
<xsl:sequence select="for $z in ex:pow($a,$n idiv 2) return
$z*$z*$a"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
<xsl:variable name="phi"
select="1.618033988749894848204586834365638117720"/>
<xsl:variable name="r5"
select="2.2360679774997896964091736687312762354406"/>
<xsl:function name="ex:fibclosed" as="xs:integer">
<xsl:param name="n" as="xs:integer"/>
<xsl:sequence select="xs:integer(floor(ex:pow($phi,$n) div $r5 + 0.5))"/>
</xsl:function>
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