SLATEC Routines --- ERFC ---

*DECK ERFC
      FUNCTION ERFC (X)
C***BEGIN PROLOGUE  ERFC
C***PURPOSE  Compute the complementary error function.
C***LIBRARY   SLATEC (FNLIB)
C***CATEGORY  C8A, L5A1E
C***TYPE      SINGLE PRECISION (ERFC-S, DERFC-D)
C***KEYWORDS  COMPLEMENTARY ERROR FUNCTION, ERFC, FNLIB,
C             SPECIAL FUNCTIONS
C***AUTHOR  Fullerton, W., (LANL)
C***DESCRIPTION
C
C ERFC(X) calculates the single precision complementary error
C function for single precision argument X.
C
C Series for ERF        on the interval  0.          to  1.00000D+00
C                                        with weighted error   7.10E-18
C                                         log weighted error  17.15
C                               significant figures required  16.31
C                                    decimal places required  17.71
C
C Series for ERFC       on the interval  0.          to  2.50000D-01
C                                        with weighted error   4.81E-17
C                                         log weighted error  16.32
C                        approx significant figures required  15.0
C
C
C Series for ERC2       on the interval  2.50000D-01 to  1.00000D+00
C                                        with weighted error   5.22E-17
C                                         log weighted error  16.28
C                        approx significant figures required  15.0
C                                    decimal places required  16.96
C
C***REFERENCES  (NONE)
C***ROUTINES CALLED  CSEVL, INITS, R1MACH, XERMSG
C***REVISION HISTORY  (YYMMDD)
C   770701  DATE WRITTEN
C   890531  Changed all specific intrinsics to generic.  (WRB)
C   890531  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900315  CALLs to XERROR changed to CALLs to XERMSG.  (THJ)
C   920618  Removed space from variable names.  (RWC, WRB)
C***END PROLOGUE  ERFC