std
std.array
std.atomic
std.bitarray
std.exception
std.intrinsic
std.memory
std.regexp
std.thread
std.traits
std.unicode
std.vararg
std.math.core
std.math.ieee
std.math.special
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std.math.special
- real erf(real x);
- Returns the error function of x.
- real erfc(real x);
- Returns the complementary error function of x, which is 1 - erf(x).
- real gamma(real x);
- The Gamma function, (x)
(x) is a generalisation of the factorial function
to real and complex numbers.
Like x!, (x+1) = x*(x).
Mathematically, if z.re > 0 then
(z) =0∞tz-1e-tdt
References:
http://en.wikipedia.org/wiki/Gamma_function,
http://www.netlib.org/cephes/ldoubdoc.html#gamma
- real loggamma(real x);
- Natural logarithm of gamma function.
Returns the base e (2.718...) logarithm of the absolute
value of the gamma function of the argument.
For reals, lgamma is equivalent to log(fabs(gamma(x))).
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