erfcx() [1/6]

template<typename T >

fvar< T > stan::math::erfcx ( const fvar< T > &  x )

inline

Return the scaled complementary error function of the argument.

The derivative comes from internal::erfcx_derivative. Below 4 it is 2 * x * erfcx(x) - 2 / sqrt(pi), which reuses the value. At 4 and above that difference cancels, so the tail rational supplies the derivative directly.

Template Parameters

T	inner type of the fvar

Parameters

x

argument

Returns

scaled complementary error function of the argument

Definition at line 26 of file erfcx.hpp.