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Feature #4897 » tau.patch

phluid61 (Matthew Kerwin), 02/28/2013 07:10 AM

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ext/bigdecimal/lib/bigdecimal/math.rb
# sin (x, prec)
# cos (x, prec)
# atan(x, prec) Note: |x|<1, x=0.9999 may not converge.
# TAU (prec)
# PI (prec)
# E (prec) == exp(1.0,prec)
#
......
y
end
# See http://tauday.com/
def TAU(prec)
raise ArgumentError, "Zero or negative argument for TAU" if prec <= 0
PI(prec)*BigDecimal("2")
end
# Computes the value of pi to the specified number of digits of precision.
def PI(prec)
raise ArgumentError, "Zero or negative argument for PI" if prec <= 0
math.c
#ifdef M_PI
rb_define_const(rb_mMath, "PI", DBL2NUM(M_PI));
rb_define_const(rb_mMath, "TAU", DBL2NUM(M_PI*2.0));
#else
rb_define_const(rb_mMath, "PI", DBL2NUM(atan(1.0)*4.0));
rb_define_const(rb_mMath, "TAU", DBL2NUM(atan(1.0)*8.0));
#endif
#ifdef M_E
(2-2/2)