# NaN return **URL:** \ **Category:** Ruby\ **Created:** [March 31, 2007, 4:35pm UTC](https://www.ruby-forum.com/t/nan-return/90734 "2007-03-31T16:35:29Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [March 31, 2007, 4:35pm UTC](https://www.ruby-forum.com/t/nan-return/90734/1 "2007-03-31T16:35:29Z")
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 ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [March 31, 2007, 4:44pm UTC](https://www.ruby-forum.com/t/nan-return/90734/2 "2007-03-31T16:44:30Z")
On 3/31/07, Josselin [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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](http://www.ruby-doc.org/core/classes/Float.html#M000244)). ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [March 31, 2007, 5:15pm UTC](https://www.ruby-forum.com/t/nan-return/90734/3 "2007-03-31T17:15:38Z")
On 2007-03-31 16:43:58 +0200, “Luis P.” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) said: > On 3/31/07, Josselin [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) 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](http://www.ruby-doc.org/core/classes/Float.html#M000244)). 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 ??? ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [March 31, 2007, 5:38pm UTC](https://www.ruby-forum.com/t/nan-return/90734/4 "2007-03-31T17:38:40Z")
On 3/31/07, Josselin [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > so 0.693524996891893 seems to be greater than 0.197314075476553 ??? 0.693524996891893 IS greater than 0.197314075476553 !! ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [April 10, 2007, 2:10pm UTC](https://www.ruby-forum.com/t/nan-return/90734/5 "2007-04-10T14:10:44Z")
On 2007-03-31 17:38:11 +0200, “Luis P.” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) said: > On 3/31/07, Josselin [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > so 0.693524996891893 seems to be greater than 0.197314075476553 ??? > > 0.693524996891893 IS greater than 0.197314075476553 !! 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 ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [March 31, 2007, 6:05pm UTC](https://www.ruby-forum.com/t/nan-return/90734/6 "2007-03-31T18:05:42Z")
> so 0.693524996891893 seems to be greater than 0.197314075476553 ??? becasue 0.6 is greater than 0.1 ! On 3/31/07, Josselin [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > thanks, I got it to test and replace cd : cd = 0.0 if cd.nan? > > so 0.693524996891893 seems to be greater than 0.197314075476553 ??? – Husein C., CEO, CTO Yucca Intelligence Development > **[قفل دیجیتال | قفل هوشمند | قفل الکترونیکی کره‌ای | یوکا](https://yuccahq.com/)** > > نگران قیمت بی‌ثبات هستی؟ از تخصصی‌ترین برند قفل هوشمند با اطمینان و تضمین قیمت خرید کن! معتبرترین برند کره جنوبی:قفل الکترونیکی یوکا همین الان تماس بگیرید و از تخفیف‌های شگفت‌انگیز ما استفاده کنید. We make the web a better place!