# derfc.f

          DOUBLE PRECISION FUNCTION DERFC (X)
    C***BEGIN PROLOGUE  DERFC
    C***PURPOSE  Compute the complementary error function.
    C***LIBRARY   SLATEC (FNLIB)
    C***CATEGORY  C8A, L5A1E
    C***TYPE      DOUBLE PRECISION (ERFC-S, DERFC-D)
    C***KEYWORDS  COMPLEMENTARY ERROR FUNCTION, ERFC, FNLIB,
    C             SPECIAL FUNCTIONS
    C***AUTHOR  Fullerton, W., (LANL)
    C***DESCRIPTION
    C
    C DERFC(X) calculates the double precision complementary error function
    C for double precision argument X.
    C
    C Series for ERF        on the interval  0.          to  1.00000E+00
    C                                        with weighted Error   1.28E-32
    C                                         log weighted Error  31.89
    C                               significant figures required  31.05
    C                                    decimal places required  32.55
    C
    C Series for ERC2       on the interval  2.50000E-01 to  1.00000E+00
    C                                        with weighted Error   2.67E-32
    C                                         log weighted Error  31.57
    C                               significant figures required  30.31
    C                                    decimal places required  32.42
    C
    C Series for ERFC       on the interval  0.          to  2.50000E-01
    C                                        with weighted error   1.53E-31
    C                                         log weighted error  30.82
    C                               significant figures required  29.47
    C                                    decimal places required  31.70
    C
    C***REFERENCES  (NONE)
    C***ROUTINES CALLED  D1MACH, DCSEVL, INITDS, 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  DERFC