erfcx_small()

double stan::math::opencl_kernels::erfcx_small

(

double

x

)

Degree-18 Chebyshev-economized expansion of erfcx about zero, for |x| < 0.46875.

Covers both signs with no branch and no library call.

Parameters

x

argument

Returns

scaled complementary error function

Definition at line 133 of file erfcx.hpp.