[Snowball-discuss] misleading directive in definition of Porter2 stemmer

[Martin Porter]

Sam,

Thanks fot that suggestion, and I've improved the wording (actually to
"delete if the preceding word part contains a vowel, and after the deletion:")

Martin



At 17:47 04/09/2008 -0400, Sam Pilato wrote:
>Hi, Martin,
> 
>In your definition of the English (Porter2) stemming algorithm
(http://snowball.tartarus.org/algorithms/english/stemmer.html), in
>Step 1b, for the second set of suffixes, you have:
> 
>  "delete if the preceding word part contains a vowel, and then [...]"
> 
>I think you mean to test the disjuncts that follow only if the deletion
succeeded. (Otherwise, the stemmer with the last disjunct
>stems "beds", "sheds", and "shreds" to "bede", "shede", and "shrede".) That
could be made more explicit by changing the wording to:
> 
>  "if the preceding word part contains a vowel, delete the suffix and then
[...]"
> 
>Regards,
>Sam