atanh.f
FUNCTION ATANH (X)
C***BEGIN PROLOGUE ATANH
C***PURPOSE Compute the arc hyperbolic tangent.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C4C
C***TYPE SINGLE PRECISION (ATANH-S, DATANH-D, CATANH-C)
C***KEYWORDS ARC HYPERBOLIC TANGENT, ATANH, ELEMENTARY FUNCTIONS,
C FNLIB, INVERSE HYPERBOLIC TANGENT
C***AUTHOR Fullerton, W., (LANL)
C***DESCRIPTION
C
C ATANH(X) computes the arc hyperbolic tangent of X.
C
C Series for ATNH on the interval 0. to 2.50000D-01
C with weighted error 6.70E-18
C log weighted error 17.17
C significant figures required 16.01
C decimal places required 17.76
C
C***REFERENCES (NONE)
C***ROUTINES CALLED CSEVL, INITS, R1MACH, XERMSG
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 900315 CALLs to XERROR changed to CALLs to XERMSG. (THJ)
C 900326 Removed duplicate information from DESCRIPTION section.
C (WRB)
C***END PROLOGUE ATANH