derf.f
DOUBLE PRECISION FUNCTION DERF (X)
C***BEGIN PROLOGUE DERF
C***PURPOSE Compute the error function.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C8A, L5A1E
C***TYPE DOUBLE PRECISION (ERF-S, DERF-D)
C***KEYWORDS ERF, ERROR FUNCTION, FNLIB, SPECIAL FUNCTIONS
C***AUTHOR Fullerton, W., (LANL)
C***DESCRIPTION
C
C DERF(X) calculates the double precision error function for double
C 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***REFERENCES (NONE)
C***ROUTINES CALLED D1MACH, DCSEVL, DERFC, INITDS
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 900727 Added EXTERNAL statement. (WRB)
C 920618 Removed space from variable name. (RWC, WRB)
C***END PROLOGUE DERF