# erf.f

          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