On Wed, 18 May 2005 13:45:30 -0700, Don <[EMAIL PROTECTED]>
wrote:
>http://www.personal.psu.edu/staff/i/u/iua1/python/apse/
The above is broken, not meeting one of the elementary conditions for
a distance metric:
distance(a, b) == distance(b, a)
Quoting from its docs:
| Note: The definition of the goodness of an approximate match is
the
| number of steps required to bring the string pattern to a form
that is
| entirely contained in the string to which it is being matched.
Note: "entirely contained in", rather than "equal to". Now read on:
| The mathing
| is not commutative. The pattern that you instantiate the class
with will be
| matched against the input. For example the word "funky" can be
made to
| match the word "funnybone" with an edit distance of one. However,
using
| "funnybone" as a pattern that will be matched to "funky" the
distance
| will become five.
|
| Example:
|
| >>> from Apse import Approx
| >>> a = Approx("funky")
| >>> a.dist("funnybone")
| 1
| >>> a = Approx("funnybone")
| >>> a.dist("funky")
| 5
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