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Date: Sat, 10 Sep 2011 18:50:52 +0200
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From: goran kent <gorankent@gmail.com>
To: lucy-user@incubator.apache.org
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Subject: Re: [lucy-user] Lucy questions wrt production, ranking, etc

On Sat, Sep 10, 2011 at 4:25 AM, Marvin Humphrey <marvin@rectangular.com> w=
rote:
> You must stringify during indexing.
>
> Here's example indexing code where both the "date" and "rainfall" fields =
are
> prepared using sprintf() so that they will sort in the desired order:
>
> =A0 =A0my %doc =3D (
> =A0 =A0 =A0 =A0location =3D> $location,
> =A0 =A0 =A0 =A0date =A0 =A0 =3D> sprintf("%0.4d-%0.2d-%0.2d", $year, $mon=
th, $day),
> =A0 =A0 =A0 =A0rainfall =3D> sprintf("%07.4f", $cm_rainfall), # e.g. 01.1=
482
> =A0 =A0);
> =A0 =A0$indexer->add_doc(\%doc);
>
> Of course you have to choose an adequate precision so you don't overflow =
and
> screw up the sort order. :)

Hmm, my sort floats are typically like this:

min:     0.1254619125
max:    3117.88289166118
typical: 0.231372871201865  (15 dec places max)

sprintf("%0.15f") in Perl produces:

0.125461912500000  ok
3117.882891661180111 screw up (should be 3117.882891661180000)
0.231372871201865 ok

I imagine the large value 3117 with the added "0111" won't present a
problem when sorting -- but I have a feeling I'm wrong, right?