Module: Flt::BinNum::Trigonometry

Defined in:
lib/flt/trigonometry.rb

Instance Method Summary collapse

Instance Method Details

#pi(round_digits = nil) ⇒ Object 



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# File 'lib/flt/trigonometry.rb', line 729

def pi(round_digits=nil)
  round_digits ||= self.precision
  nhexd = (round_digits+3)/4 + 1
  v = Num[16]::Trigonometry.pi_hex_digits(nhexd)
  l = v.size
  v = v.to_i(16)
  e = (1-l)*4
  # add trailing 01 for rounding (there always be some non null digit beyond the rounding point)
  v <<= 2
  v |= 1
  e -= 2
  num_class.context(self, :precision=>round_digits){+num_class.Num(+1,v,e)}
end