_dawson _erfci _erfi _fresc _fress

_erfi() double _erfi ( double  p ) Error function erf(x) inverse Purpose erfi returns a value x such that p = erf(x), where p is the specified value of the error function. Returns Value of x. Parameters [in] p Argument p. (-1 < p < 1) Error handling If p < -1 or p > 1, domain error (EDOM) occurs. If p = -1, -inf is returned and range error (ERANGE) occurs. If p = 1, inf is returned and range error (ERANGE) occurs. Other range error (ERANGE) may occur. Reference boost/math/special_functions