[Xapian-discuss] PHP set_bias and sorting in general
olly at survex.com
Mon Nov 8 17:03:13 GMT 2004
On Thu, Nov 04, 2004 at 01:22:01AM +0000, Francis Irving wrote:
> 1. I'm playing with set_bias from PHP, and get this error.
> Fatal error: Type error in argument 3 of Enquire_set_bias. Expected
> The line of code is:
> enquire_set_bias($this->enquire, $weight, $halflife);
It appears SWIG doesn't know that it can just pass a number for time_t.
It probably wants a typemap entry, but you could try just changing the
prototype of Enquire::set_bias() in xapian-bindings/xapian.i to use
'unsigned long long' instead of time_t (or whatever the appropriate type
is on your OS).
> 2. While on the subject, any idea when you'll add a proper API for bias?
I'm afraid I don't know. It's on my list, but so are many other things.
> 3. Any advice on selecting the weight for bias? The halflife I can
> guess at, but I'm not sure what scale of weight is sensible.
Something comparable to the weights which the terms get I'd expect. I
didn't get as far as tuning the values to use. It's possible there's
something of a catch 22 here where you really need to run the query to
know what weight makes sense. Perhaps you should actual specify a value
which is scaled by the maximum weight a document could get, or something
like that. Feedback from trying to use this would be very useful.
> 4. I've tried enquire_set_sorting from Perl and PHP and it doesn't seem
> to do anything. I've set values in the documents, and can use those
> values with clustering no problem. They just can't seem to be used to
> influence sorting. Any suggestions? I can provide more info.
There are tests for set_sorting so it looks like it works in C++. Can
you post a simple example?
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