dawson erfci erfi fresc fress

erfci() double erfci ( double  q ) Complementary error function erf(x) inverse Purpose erfci returns a value x such that q = erfc(x), where q is the specified value of the complementary error function. Returns Value of x. Parameters [in] q Argument q. (0 < q < 2) Error handling If q < 0 or q > 2, domain error (EDOM) occurs. If q = 0, inf is returned and range error (ERANGE) occurs. If q = 2, -inf is returned and range error (ERANGE) occurs. Other range error (ERANGE) may occur. Reference boost/math/special_functions