Class: Float

Inherits:
Object show all
Defined in:
lib/sequence_logo/ytilib/addon.rb,
lib/sequence_logo/ytilib/infocod.rb

Instance Method Summary collapse

Instance Method Details

#cut_to(x) ⇒ Object 



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# File 'lib/sequence_logo/ytilib/addon.rb', line 20

def cut_to(x)
  (self.abs * 10**x).floor.to_f * (self == 0.0 ? 0 : self/self.abs).round / 10**x
end

#log_fact ⇒ Object

Using Stieltjes formula from www.luschny.de/math/factorial/approx/SimpleCases.html



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# File 'lib/sequence_logo/ytilib/infocod.rb', line 5

def log_fact
  return 0.0 if self <= 1
  a0 = 1.0/12
  a1 = 1.0/30 
  a2 = 53.0/210
  a3 = 195.0/371
  a4 = 22999.0/22737
  a5 = 29944523.0/19733142
  a6 = 109535241009.0/48264275462
  z_big = self+1;
  (1.0/2)*Math.log(2*Math::PI)+(z_big-1.0/2)*Math.log(z_big)-z_big + a0/(z_big+a1/(z_big+a2/(z_big+a3/(z_big+a4/(z_big+a5/(z_big+a6/z_big))))))
end

#round_to(x) ⇒ Object 



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# File 'lib/sequence_logo/ytilib/addon.rb', line 16

def round_to(x)
  (self * 10**x).round.to_f / 10**x
end