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From "O. Olson" <olson_...@yahoo.it>
Subject Re: Is there a problem with -Infinity as boost?
Date Tue, 21 Oct 2014 14:31:49 GMT
Thank you Walter. I liked your solution! This is what I was looking for i.e.

&boost=log(sum(1,qty))

O. O.


Walter Underwood wrote
> The usual fix for this is log(1+qty). If you might have negative values,
> you can use log(max(1,qty)).
> 
> wunder
> Walter Underwood

> wunder@

> http://observer.wunderwood.org/
> 
> On Oct 20, 2014, at 3:04 PM, O. Olson &lt;

> olson_ord@

> &gt; wrote:
> 
>> I am considering using a boost as follows: 
>> 
>> &boost=log(qty)
>> 
>> Where qty is the quantity in stock of a given product i.e. qty could be
>> 0,
>> 1, 2, 3, … etc. The problem I see is that log(0) is -Infinity. Would this
>> be
>> a problem for Solr? For me it is not a problem because 
>> log(0) < log(1) < log(2) etc. 
>> 
>> I'd be grateful for any thoughts. One alternative is to use max e.g.
>> &boost=max(log(qty), -1) 
>> 
>> But still this would cause Solr to compute the -Infinity and then discard
>> it.  So can I use an expression for boost that would result in –Infinity? 
>> 
>> Thank you
>> O. O.
>>





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