Subject: Re: [xsl] Increasing sequence ? From: "Wolfgang Laun wolfgang.laun@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Thu, 26 Mar 2015 05:45:20 -0000 |
Isn't it reasonable to assume that a sequence implementation has the number of items "ready to use"? Perhaps someone with insight into implementations can answer that? -W On 26 March 2015 at 03:42, Dimitre Novatchev dnovatchev@xxxxxxxxx < xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > On Wed, Mar 25, 2015 at 11:51 AM, Wolfgang Laun > wolfgang.laun@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> > wrote: > >> not($seq[2]) or $seq[1] lt $seq[2] and increasing(subsequence($seq, > 2)) > > > > > > It would appear that this makes -1,0,2,1 an ascending sequence. I dislike > > this "empty-is-false trick" - once in a while you get bitten. > > > > count($seq) < 2 or ... > > Yes, good to remind that we are dealing with items -- not just nodes. > > > count($seq) < 2 or ... > > No, the idea is to avoid count, as this may add the time for one > unnecessary pass over the sequence. And the solution can be adjusted > naturally: > > <xsl:function name="my:increasing" as="xs:boolean"> > <xsl:param name="pSeq" as="item()*"/> > > <xsl:sequence select= > "empty($pSeq[2]) > or > $pSeq[1] lt $pSeq[2] and my:increasing(subsequence($pSeq, 2))"/> > </xsl:function> > > > > > -- > 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 > ------------------------------------- > To avoid situations in which you might make mistakes may be the > biggest mistake of all > ------------------------------------ > Quality means doing it right when no one is looking. > ------------------------------------- > You've achieved success in your field when you don't know whether what > you're doing is work or play > ------------------------------------- > To achieve the impossible dream, try going to sleep. > ------------------------------------- > Facts do not cease to exist because they are ignored. > ------------------------------------- > Typing monkeys will write all Shakespeare's works in 200yrs.Will they > write all patents, too? :) > ------------------------------------- > I finally figured out the only reason to be alive is to enjoy it.
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