Feature #4897 ยป tau.patch
| ext/bigdecimal/lib/bigdecimal/math.rb | ||
|---|---|---|
| 7 | 7 |
# sin (x, prec) |
| 8 | 8 |
# cos (x, prec) |
| 9 | 9 |
# atan(x, prec) Note: |x|<1, x=0.9999 may not converge. |
| 10 |
# TAU (prec) |
|
| 10 | 11 |
# PI (prec) |
| 11 | 12 |
# E (prec) == exp(1.0,prec) |
| 12 | 13 |
# |
| ... | ... | |
| 144 | 145 |
y |
| 145 | 146 |
end |
| 146 | 147 |
|
| 148 |
# See http://tauday.com/ |
|
| 149 |
def TAU(prec) |
|
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raise ArgumentError, "Zero or negative argument for TAU" if prec <= 0 |
|
| 151 |
PI(prec)*BigDecimal("2")
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|
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end |
|
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|
|
| 147 | 154 |
# Computes the value of pi to the specified number of digits of precision. |
| 148 | 155 |
def PI(prec) |
| 149 | 156 |
raise ArgumentError, "Zero or negative argument for PI" if prec <= 0 |
| math.c | ||
|---|---|---|
| 782 | 782 |
|
| 783 | 783 |
#ifdef M_PI |
| 784 | 784 |
rb_define_const(rb_mMath, "PI", DBL2NUM(M_PI)); |
| 785 |
rb_define_const(rb_mMath, "TAU", DBL2NUM(M_PI*2.0)); |
|
| 785 | 786 |
#else |
| 786 | 787 |
rb_define_const(rb_mMath, "PI", DBL2NUM(atan(1.0)*4.0)); |
| 788 |
rb_define_const(rb_mMath, "TAU", DBL2NUM(atan(1.0)*8.0)); |
|
| 787 | 789 |
#endif |
| 788 | 790 |
|
| 789 | 791 |
#ifdef M_E |