Feature #4897 » tau.patch
| ext/bigdecimal/lib/bigdecimal/math.rb | ||
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# sin (x, prec)
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# cos (x, prec)
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# atan(x, prec) Note: |x|<1, x=0.9999 may not converge.
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# TAU (prec)
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# PI (prec)
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# E (prec) == exp(1.0,prec)
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#
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| ... | ... | |
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y
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end
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# See http://tauday.com/
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def TAU(prec)
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raise ArgumentError, "Zero or negative argument for TAU" if prec <= 0
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PI(prec)*BigDecimal("2")
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end
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# Computes the value of pi to the specified number of digits of precision.
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def PI(prec)
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raise ArgumentError, "Zero or negative argument for PI" if prec <= 0
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| math.c | ||
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#ifdef M_PI
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rb_define_const(rb_mMath, "PI", DBL2NUM(M_PI));
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rb_define_const(rb_mMath, "TAU", DBL2NUM(M_PI*.20));
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#else
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rb_define_const(rb_mMath, "PI", DBL2NUM(atan(1.0)*4.0));
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rb_define_const(rb_mMath, "TAU", DBL2NUM(atan(1.0)*8.0));
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#endif
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#ifdef M_E
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