Hi,

try this code..
require "mathn"
puts getTime=Time.now
# normal standard deviation test"
 def variance(population)
            n = 0
            mean = 0.0
            s = 0.0


            population.each { |x|
              n = n + 1
              delta = x.to_f - mean.to_f
              mean = mean.to_f + (delta.to_f / n).to_f
              s = s + delta.to_f * (x.to_f - mean.to_f).to_f
            }


            # if you want to calculate std deviation
            # of a sample change this to "s / (n-1)"

            return (s / (n-1)).to_f
          end

chk_Arr=[632,567,936,109,180,23,369,284,40,36,233,280,752,293,84]

puts  Math.sqrt(variance(chk_Arr))


Superclass mismatch for class rational...

error i get is ..

Superclass mismatch for class rational...

any idea....

Thanks
SASADA Koichi wrote:
> Hi,
> 
> On my environment:
> 
> # ./ruby -v
> ruby 1.9.0 (2007-05-17 patchlevel 0) [i686-linux]
> # make runruby
> ./miniruby  ../trunk/runruby.rb --extout=.ext -- ../trunk/test.rb
> hello world
> 
> Any other hint?


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