NaN return

ruby-talk
1

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

2

Float has a 'nan?' method
(class Float - RDoc Documentation).

···

On 3/31/07, Josselin <josselin@wanadoo.fr> wrote:

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

3

thanks, I got it to test and replace cd : cd = 0.0 if cd.nan?

Float comparison is quite strange :
cd = 0.0
=> 0.0

irb(main):010:0> d = 0.197314075476553
=> 0.197314075476553

irb(main):011:0> (cd <=> d) > 0
=> false

BUT .....

irb(main):006:0> cd = 0.693524996891893
=> 0.693524996891893

irb(main):007:0> d = 0.197314075476553
=> 0.197314075476553

irb(main):008:0> (cd <=> d) > 0
=> true

so 0.693524996891893 seems to be greater than 0.197314075476553 ???

···

On 2007-03-31 16:43:58 +0200, "Luis Parravicini" <lparravi@gmail.com> said:

On 3/31/07, Josselin <josselin@wanadoo.fr> wrote:

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

  Float has a 'nan?' method
(class Float - RDoc Documentation).

4

0.693524996891893 IS greater than 0.197314075476553 !!

···

On 3/31/07, Josselin <josselin@wanadoo.fr> wrote:

so 0.693524996891893 seems to be greater than 0.197314075476553 ???

5

so 0.693524996891893 seems to be greater than 0.197314075476553 ???

becasue 0.6 is greater than 0.1 !

···

On 3/31/07, Josselin <josselin@wanadoo.fr> wrote:

On 2007-03-31 16:43:58 +0200, "Luis Parravicini" <lparravi@gmail.com> said:

> On 3/31/07, Josselin <josselin@wanadoo.fr> wrote:
>> something like..
>> cd = proposal.distance_to(current_city) != NaN ?
>> proposal.distance_to(current_city) : 0.0
>
> Float has a 'nan?' method
> (class Float - RDoc Documentation).

thanks, I got it to test and replace cd : cd = 0.0 if cd.nan?

Float comparison is quite strange :
cd = 0.0
=> 0.0

irb(main):010:0> d = 0.197314075476553
=> 0.197314075476553

irb(main):011:0> (cd <=> d) > 0
=> false

BUT .....

irb(main):006:0> cd = 0.693524996891893
=> 0.693524996891893

irb(main):007:0> d = 0.197314075476553
=> 0.197314075476553

irb(main):008:0> (cd <=> d) > 0
=> true

so 0.693524996891893 seems to be greater than 0.197314075476553 ???

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Husein Choroomi,
CEO, CTO
Yucca Intelligence Development
http://www.YuccaHQ.com

We make the web a better place!

6

As I discover it few times after my post, I spent sometime away in a ruby-church requiring forgiveness for my silly question... I also bought new glasses ;-))) before coming back crawling on the ground and raising my hands on the keyboard

thanks ;-)))

joss

···

On 2007-03-31 17:38:11 +0200, "Luis Parravicini" <lparravi@gmail.com> said:

On 3/31/07, Josselin <josselin@wanadoo.fr> wrote:

so 0.693524996891893 seems to be greater than 0.197314075476553 ???

   0.693524996891893 IS greater than 0.197314075476553 !!