Xapian discuss - Jul 2007 - Stemming problem

Does anyone know if xapian stemming support suffix -er? I tried -s and -ing 
both work, but not -er.

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On Wed, Jul 04, 2007 at 05:54:32PM +0800, Yan Hao wrote:
> Does anyone know if xapian stemming support suffix -er? I tried -s
> and -ing both work, but not -er.
Do you have an example word where -er should be removed in stemming?

J

-- 
/--------------------------------------------------------------------------\
  James Aylett                                                  xapian.org
  james@tartarus.org                               uncertaintydivision.org

On Wed, Jul 04, 2007 at 05:54:32PM +0800, Yan Hao wrote:
> Does anyone know if xapian stemming support suffix -er? I tried -s and -ing
> both work, but not -er.
Yes, suffix -er is removed in step 4:

http://snowball.tartarus.org/algorithms/english/stemmer.html

And "computer" stems to "comput" (as do "compute",
"computation", etc).

There are rules about when steps are applied, so short words like
"infer"
and "over" don't have -er removed.  Certainly in these two cases,
removing
-er wouldn't be beneficial.

Cheers,
    Olly

I created sample files with test, tester, testing, tests. A query of
"test"
could find all of them except "tester".

>From: James Aylett <james-xapian@tartarus.org>
>To: xapian-discuss@lists.xapian.org
>Subject: Re: [Xapian-discuss] Stemming problem
>Date: Wed, 4 Jul 2007 11:23:16 +0100
>
>On Wed, Jul 04, 2007 at 05:54:32PM +0800, Yan Hao wrote:
>
> > Does anyone know if xapian stemming support suffix -er? I tried -s
> > and -ing both work, but not -er.
>
>Do you have an example word where -er should be removed in stemming?
>
>J
>
>--
>/--------------------------------------------------------------------------\
>   James Aylett                                                  
xapian.org
>   james@tartarus.org                               
uncertaintydivision.org
>
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