From: Lennart Borgman <lennart.borgman@gmail.com>
To: "René Kyllingstad" <listmailemacs@kyllingstad.com>
Cc: Stephen Berman <stephen.berman@gmx.net>,
Stefan Monnier <monnier@iro.umontreal.ca>,
emacs-devel@gnu.org
Subject: Re: uniq
Date: Sun, 5 Dec 2010 20:15:33 +0100 [thread overview]
Message-ID: <AANLkTi=E_kz-K7cQJucGJREbiiNWxdcsMZu4aTCpHGqY@mail.gmail.com> (raw)
In-Reply-To: <AANLkTini=5wivATDL4VRu5ZcFP1qbriMFD9Vik6k2u-Q@mail.gmail.com>
2010/12/5 René Kyllingstad <listmailemacs@kyllingstad.com>:
> On Sat, Dec 4, 2010 at 3:09 PM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>>> Would it be faster to avoid nested while-loops?
>>
>> Not sure if `member' is faster than `re-search-forward', but if you
>> replace re-search-forward with just search-forward (which requires
>> a bit more care since you need to manually check that matches are
>> anchored at bol and eol) I'm pretty sure that'll be even faster since it
>> will then use a more efficient search algorithm that gets faster the
>> longer the line of text you're looking for.
>
> Even better, use a hash table to keep the already seen lines. Maybe
> call it delete-duplicate-lines, similar to delete-matching-lines.
Or maybe using a schwarzian transform to sort only line numbers and
then from this list just delete duplicates (moving backwards).
prev parent reply other threads:[~2010-12-05 19:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-04 2:41 uniq Tak Ota
2010-12-04 12:08 ` uniq Stephen Berman
2010-12-04 14:09 ` uniq Stefan Monnier
2010-12-05 18:54 ` uniq René Kyllingstad
2010-12-05 19:15 ` Lennart Borgman [this message]
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