 
      COMPLEX FUNCTION CATANH(Z)
C***BEGIN PROLOGUE  CATANH
C***DATE WRITTEN   770401   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  C4C
C***KEYWORDS  ARC HYPERBOLIC TANGENT,COMPLEX,ELEMENTARY FUNCTION
C***AUTHOR  FULLERTON, W., (LANL)
C***PURPOSE  Computes the complex arc hyperbolic Tangent.
C***DESCRIPTION
C
C CATANH(Z) calculates the complex arc hyperbolic tangent of Z.
C***REFERENCES  (NONE)
C***ROUTINES CALLED  CATAN
C***END PROLOGUE  CATANH
 
 
