From: Josselin <josselin@...>
Date: 2007-03-31T23:35:10+09:00
Subject: NaN return

I am using a method 'distance_to'  from a lib returning a distance in 
Float type based on latitude/longitude

    @ proposals.each  do | proposal |
        cd = proposal.distance_to(current_city)
        @d = cd  if (@d <=> cd) > 0
      end

a problem arise when the proposal latitude/longitude are equivalent to 
current_city latitude/longitude
in this case it returns NaN (and not 0.0.. don't know why....)
if I don't modify the lib script, how I can get bypass this results 
(obviously I don't care about 0.0 distance)

something like..
cd = proposal.distance_to(current_city) != NaN ? 
proposal.distance_to(current_city) : 0.0