[XSL-LIST Mailing List Archive Home] [By Thread] [By Date]

Re: [xsl] Creating new, distinct groups of ranges from an aggregation of individual ranges


Subject: Re: [xsl] Creating new, distinct groups of ranges from an aggregation of individual ranges
From: "Paul Tyson phtyson@xxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 18 Nov 2014 14:07:57 -0000

A fascinating problem, for which I've coded various partial solutions in 3 or
4 languages over the years.

As you've suggested, a simple workable approach is to make a list of end
points, put them in order, and pair them off to form new ranges. (I've never
thought of this as a "grouping" problem.)

I've also implemented it as a segment tree (see in Wikipedia). This is
particularly elegant and can solve problems that are very difficult otherwise
(e.g. Is there a configuration where all components are like X?)

There are other approaches but typing on phone is tedious so if you are
interested let me know.

Regards,
--Paul

> On Nov 17, 2014, at 23:07, Michael Friedman sumarimike@xxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Greetings,
>
> I'm trying to use XSLT 2.0 to create a new set of grouped ranges based on
the overlap of an aggregation of a set of non-contiguous individual ranges.
Example:
>
> Given a range of numbers as an individual set:
> 1. <range>150-202</range>
> 2. <range>201-225</range>
> 3. <range>201-204</range>
> 4. <range>205-234</range>
> 5. <range>226-234, 250-260</range>
>
> I'm trying to produce a new grouping based on the way the groups overlap:
> 150-200 (this is where <range> 1 starts and overlaps to 2 & 3)
> 201-202 (this is where 1 & 2 overlap, and group 1 ends)
> 203-204 (this is where 2 & 3 overlap and 3 ends)
> 205-225 (this is where 4 starts and begins to overlap with 5)
> 226-234 (this is where 4 & 5 overlap and end for the first part of 5)
> 250-260 (this is where the second range in 5 exists)
>
> The start and end point of the individual source ranges form the
boundaries.
>
> I expect to end up with a string or variable structure like:
> <finalrange>
> <range>150-200</range>
> <range>201-202</range>
> etc
> </finalrange>
> or:
> <range start="150" end="200"/>
> <range start="201" end="202"/>
> etc
>
> Ultimately I have to format some content in XSLFO based on the XML's
participation in the "new" given range grouping. If you know aircraft
effectivity, this is what I am trying to group.
>
> I've been using <xsl:sequence> to find all the numbers of a single range, so
I can do compares against individual numbers in the entire range, if
necessary. But, it seems like it may be easier to just work with the
boundaries: the start and end points and see if a value falls within it,
somehow, rather than iterating repetitively through enumerations of
sequences.
>
> I've been searching the archives for a while and have found some evocative
possibilities from Dimitre Novatchev and Michael Kay, but I can't quite find a
way to work with the overlapping. I'm continuing to study their
ranging/grouping examples, but help would be appreciated!
>
> Thanks,
> Michael Friedman
> XSL-List info and archive
> EasyUnsubscribe (by email)


Current Thread
Keywords