diff options
Diffstat (limited to 'math.c')
-rw-r--r-- | math.c | 13 |
1 files changed, 6 insertions, 7 deletions
@@ -836,6 +836,8 @@ mingw_tgamma(const double d) * */ +#define NGAMMA_TABLE 23 + static VALUE math_gamma(VALUE obj, VALUE x) { @@ -868,16 +870,13 @@ math_gamma(VALUE obj, VALUE x) * 53bit mantissa. */ }; double d; - double intpart, fracpart; d = Get_Double(x); /* check for domain error */ if (isinf(d) && signbit(d)) domain_error("gamma"); - fracpart = modf(d, &intpart); - if (fracpart == 0.0) { - if (intpart < 0) domain_error("gamma"); - if (0 < intpart && - intpart - 1 < (double)numberof(fact_table)) { - return DBL2NUM(fact_table[(int)intpart - 1]); + if (d == floor(d)) { + if (d < 0.0) domain_error("gamma"); + if (1.0 <= d && d <= NGAMMA_TABLE) { + return DBL2NUM(fact_table[(int)d - 1]); } } return DBL2NUM(tgamma(d)); |