[Snowball-discuss] Another Porter2 question: "able" sample seems wrong

[Martin Holmes]

Forgive me, my logic was backwards. It's to be deleted if NOT preceded 
by a short syllable.

I have it working perfectly now.

Sorry for the distraction.

Cheers,
Martin

On 2019-06-30 10:07 a.m., Martin Holmes wrote:
> Hi Martin,
> 
> I've hit another issue with exactly this point in the algorithm. The 
> word "knife" (to take one example) survives unchanged as far as Step 5. 
> Then we have the instruction:
> 
> e  :  delete if in R2, or in R1 and not preceded by a short syllable
> 
> R1 for knife is position 5 (e), and R2 is position 6 (empty).
> 
> So:
> 
>   - the final e is not in R2; but
> 
>   - The final e is in R1, so the second condition applies:
> 
> If e is preceded by a short syllable, then it should be deleted.
> 
> What precedes the e is "knif". This seems to me to match the definition 
> of a short syllable:
> 
> "Define a short syllable in a word as either (a) a vowel followed by a 
> non-vowel other than w, x or Y and preceded by a non-vowel, or * (b) a 
> vowel at the beginning of the word followed by a non-vowel."
> 
> Definition a) seems to apply: a vowel (i) followed by a non-vowel other 
> than w, x or Y (f) and preceded by a non-vowel (n).
> 
> Therefore the e should be deleted. But in the test data it isn't.
> 
> What am I missing?
> 
> All help appreciated,
> Martin
> 
> 
> On 2019-06-04 12:36 p.m., Martin Porter wrote:
>> yes, I think your last point is effectively the right way of looking
>> at it. 'e' is in R1, but 'e' itself is preceded by (immediately
>> preceded by) 'abl', which is not a short syllable.
>>
>> The idea of all this is to distinguish (for example), ap and ape, so
>> ap and aps stem to ap, and ape, apes, aping, aped stem to ape. It is a
>> distinction for the "short syllable" case.
>>
>> (Incidentally, I am somewhat quoting from memory here, not having
>> access to my Linux machine, but I think I've got this right.)
>>
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> 
> 
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