to find the first numeric line?

[Peter Haworth]

Here's another tack on this using a regular expression

if matchChunk(theList,"(?m)^(\d)",tStartChar,tEndChar) then
   put the lineIndex of char tStartChar of theList into tLineNumber
else
   put zero into tLineNumber
end if

I tested this out and it works but don't know if it's any faster than
looping through.  Plus I think the lineIndex is a relatively recent
addition so it won;t work with older versions of LC.

Pete
lcSQL Software <http://www.lcsql.com>


On Thu, Jan 31, 2013 at 10:37 AM, <dunbarx at aol.com> wrote:

> Hi.
>
>
> I tried this with a list "temp" of 24,000 lines. Takes about half a second:
>
>
>
>
> on mouseup
>     sort temp numeric
>    put 0 into tCounter
>    repeat for each line tLine in temp
>       add 1 to tCounter
>       if char 1 of tLine is an integer then
>          exit repeat
>       end if
>    end repeat
>    answer tLine && tCounter
> end mouseup
>
>
>
>
>
> Craig
>
>
>
> -----Original Message-----
> From: Tiemo Hollmann TB <toolbook at kestner.de>
> To: 'How to use LiveCode' <use-livecode at lists.runrev.com>
> Sent: Thu, Jan 31, 2013 1:13 pm
> Subject: AW: to find the first numeric line?
>
>
> Its about 20,000 lines.
> I have made it with cutting into halves, which works ok. Perhaps I give it
> a
> timestamp test compared to just looping through.
> Tiemo
>
> > -----Ursprüngliche Nachricht-----
> > Von: use-livecode [mailto:use-livecode-bounces at lists.runrev.com] Im
> Auftrag
> > von dunbarx at aol.com
> > Gesendet: Donnerstag, 31. Januar 2013 18:56
> > An: use-livecode at lists.runrev.com
> > Betreff: Re: to find the first numeric line?
> >
> > Hi.
> >
> >
> > If you sort your alphanumeric list, you will, of course, already know
> that
> > the alphas sort before the digits, so the first digit will be down a bit.
> >
> >
> >
> > But how long is that list? After sorting, if you loop through using the
> > "repeat for each..." variant and exit accordingly, I cannot imagine that
> it
> > would take more than an instant to find the first digital char. Old
> > fashioned but trusty.
> >
> >
> > I have done binary searches, splitting data in halves as you go so that
> you
> > cut down processing time, mainly finding stuff in long HC datasets.
> >
> >
> > Craig Newman
> >
> >
> >
> >
> >
> >
> > -----Original Message-----
> >
> > From: Tiemo Hollmann TB <toolbook at kestner.de>
> > To: 'How to use LiveCode' <use-livecode at lists.runrev.com>
> > Sent: Thu, Jan 31, 2013 11:54 am
> > Subject: to find the first numeric line?
> >
> >
> > Hello,
> >
> > I have a list with alphanumeric and numeric content. After sorting
> numeric
> > I would like to find the first line with a numeric first char. (the non
> > numeric lines before can contain also numeric chars). I would like to
> have
> > a kind of lineoffset(isNumber(first char.),list,), but that's not
> prebuilt.
> >
> > What would be the fastest or most straight forward way to look up such a
> > list? Just looping through? Testing the first char every half of the list
> > in a loop? Or is there a function I don't think of?
> >
> > Thanks for any pointers
> >
> > Tiemo
> >
> >
> >
> >
> >
> >
> >
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