On Fri, Jul 22, 2011 at 4:11 PM, Brian Lamb <brian.l...@journalexperts.com> wrote: > I've noticed some peculiar scoring issues going on in my application. For > example, I have a field that is multivalued and has several records that > have the same value. For example, > > <arr name="references"> > <str>National Society of Animal Lovers</str> > <str>Nat. Soc. of Ani. Lov.</str> > </arr> > > I have about 300 records with that exact value. > > Now, when I do a search for references:(national society animal lovers), I > get the following results: > > <id>252</id> > <id>159</id> > <id>82</id> > <id>452</id> > <id>105</id> > > When I do a search for references:(nat soc ani lov), I get the results > ordered differently: > > <id>510</id> > <id>122</id> > <id>501</id> > <id>82</id> > <id>252</id> > > When I load all the records that match, I notice that at some point, the > scores aren't the same but differ by only a little: > > 1.471928 in one and the one before it was 1.471929
32 bit floats only have 7 decimal digits of precision, and in floating point land (a+b+c) can be slightly different than (c+b+a) -Yonik http://www.lucidimagination.com
