SLATEC Routines --- ERF ---

*DECK ERF
      FUNCTION ERF (X)
C***BEGIN PROLOGUE  ERF
C***PURPOSE  Compute the error function.
C***LIBRARY   SLATEC (FNLIB)
C***CATEGORY  C8A, L5A1E
C***TYPE      SINGLE PRECISION (ERF-S, DERF-D)
C***KEYWORDS  ERF, ERROR FUNCTION, FNLIB, SPECIAL FUNCTIONS
C***AUTHOR  Fullerton, W., (LANL)
C***DESCRIPTION
C
C ERF(X) calculates the single precision error function for
C 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***REFERENCES  (NONE)
C***ROUTINES CALLED  CSEVL, ERFC, INITS, R1MACH
C***REVISION HISTORY  (YYMMDD)
C   770401  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  ERF