# Rounding problem **URL:** \ **Category:** rubyonrails-talk\ **Created:** [March 30, 2010, 8:21am UTC](https://discuss.rubyonrails.org/t/rounding-problem/50517 "2010-03-30T08:21:46Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![JanneKo](https://avatars.discourse-cdn.com/v4/letter/j/3e96dc/32.png) [@JanneKo](https://discuss.rubyonrails.org/u/JanneKo)\ **Post date:** [March 30, 2010, 8:21am UTC](https://discuss.rubyonrails.org/t/rounding-problem/50517/1 "2010-03-30T08:21:46Z")
Hi, I have a strange problem with number rounding: If I try "a\_number.round(2)" in console - it works, but the same line thru passenger fails: "wrong number of arguments (1 for 0)". Any ideas why? I'm running rails 2.3.4 and passenger 2.2.9 ---
**Author:** ![Con](https://avatars.discourse-cdn.com/v4/letter/c/9fc29f/32.png) [@Con](https://discuss.rubyonrails.org/u/Con)\ **Post date:** [March 30, 2010, 9:20am UTC](https://discuss.rubyonrails.org/t/rounding-problem/50517/2 "2010-03-30T09:20:14Z")
> Hi, > > I have a strange problem with number rounding: > > If I try “a\_number.round(2)” in console - it works, but the same line > > thru passenger fails: “wrong number of arguments (1 for 0)”. > > Any ideas why? > > I’m running rails 2.3.4 and passenger 2.2.9 Hi, what’s the value of a\_number being used? -Conrad ---
**Author:** ![Frederick\_Cheung](https://sea2.discourse-cdn.com/rubyonrails/user_avatar/discuss.rubyonrails.org/frederick_cheung/32/3901_2.png) [@Frederick\_Cheung](https://discuss.rubyonrails.org/u/Frederick_Cheung)\ **Post date:** [March 30, 2010, 9:30am UTC](https://discuss.rubyonrails.org/t/rounding-problem/50517/3 "2010-03-30T09:30:15Z")
> Hi, > > I have a strange problem with number rounding: If I try "a\_number.round(2)" in console - it works, but the same line thru passenger fails: "wrong number of arguments (1 for 0)". Any ideas why? Is a\_number an integer ? rails overrides round to allow it to take a precision argument, but it only does that on Float - Integers still have the standard round method, which does not take a precision argument. Fred ---
**Author:** ![JanneKo](https://avatars.discourse-cdn.com/v4/letter/j/3e96dc/32.png) [@JanneKo](https://discuss.rubyonrails.org/u/JanneKo)\ **Post date:** [March 30, 2010, 9:58am UTC](https://discuss.rubyonrails.org/t/rounding-problem/50517/4 "2010-03-30T09:58:47Z")
Thanks for the answers - This solved my problem partly. In database (mysql) the number is a decimal - but for some reason it seems to be an integer in rails if it's decimals are zeros. Janne ---
**Author:** ![Joel\_Dezenzio](https://avatars.discourse-cdn.com/v4/letter/j/96bed5/32.png) [@Joel\_Dezenzio](https://discuss.rubyonrails.org/u/Joel_Dezenzio)\ **Post date:** [March 30, 2010, 2:40pm UTC](https://discuss.rubyonrails.org/t/rounding-problem/50517/5 "2010-03-30T14:40:36Z")
class Float   def round\_to(x)     (self \* 10\*\*x).round.to\_f / 10\*\*x   end end then you can use round\_to(2) Sincerely, Joel Dezenzio Website Bio: [http://jdezenzio.com/](http://jdezenzio.com/) Rails Production Sites: [http://ncaastatpages.com](http://ncaastatpages.com) ---
**Author:** ![Michael\_Pavling](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@Michael\_Pavling](https://discuss.rubyonrails.org/u/Michael_Pavling)\ **Post date:** [March 30, 2010, 4:03pm UTC](https://discuss.rubyonrails.org/t/rounding-problem/50517/6 "2010-03-30T16:03:32Z")
To avoid floating point errors, you might as well just do : (self \* 1.0).round.(x) or self.to\_f.round.(x) And wouldn't that be a patch to class Integer, as Float already has .round working fine? Or am I missing something ?:-/ ---
**Author:** ![Charles\_A\_Lopez](https://avatars.discourse-cdn.com/v4/letter/c/e9c0ed/32.png) [@Charles\_A\_Lopez](https://discuss.rubyonrails.org/u/Charles_A_Lopez)\ **Post date:** [March 30, 2010, 6:09pm UTC](https://discuss.rubyonrails.org/t/rounding-problem/50517/7 "2010-03-30T18:09:27Z")
what is the range of values that you’re working with? 0 to 100, -3000 to 4000?