_O_n_l_i_n_e _M_a_n_u_a_l		Library	Functions		  erf(3m)



NNNNAAAAMMMMEEEE
     erf, erfc - error function	and complementary error	function

SSSSYYYYNNNNTTTTAAAAXXXX
     ####iiiinnnncccclllluuuuddddeeee <<<<mmmmaaaatttthhhh....hhhh>>>>

     ddddoooouuuubbbblllleeee eeeerrrrffff((((xxxx))))
     ddddoooouuuubbbblllleeee xxxx;;;;

     ddddoooouuuubbbblllleeee eeeerrrrffffcccc((((xxxx))))
     ddddoooouuuubbbblllleeee xxxx;;;;

DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
     _e_r_f returns the error function of _x, defined as
						     \|
						       __
						       i~i~
						     __2__
							 0

							 x
							  e-t2dt.

     _e_r_f_c, returns 1.0 - _e_r_f(_x).

SSSSEEEEEEEE AAAALLLLSSSSOOOO
     Library Functions (3):  exp

AAAAPPPPPPPPLLLLIIIICCCCAAAATTTTIIIIOOOONNNN UUUUSSSSAAAAGGGGEEEE
     _e_r_f_c is provided because of the extreme loss of relative
     accuracy if _e_r_f(_x)	is called for large _x and the result sub-
     tracted from 1.0.

December 1990				TX Programmer's	Reference