SLATEC Routines --- CTAN ---

*DECK CTAN
      COMPLEX FUNCTION CTAN (Z)
C***BEGIN PROLOGUE  CTAN
C***PURPOSE  Compute the complex tangent.
C***LIBRARY   SLATEC (FNLIB)
C***CATEGORY  C4A
C***TYPE      COMPLEX (CTAN-C)
C***KEYWORDS  ELEMENTARY FUNCTIONS, FNLIB, TANGENT, TRIGONOMETRIC
C***AUTHOR  Fullerton, W., (LANL)
C***DESCRIPTION
C
C CTAN(Z) calculates the complex trigonometric tangent of complex
C argument Z.  Z is in units of radians.
C
C***REFERENCES  (NONE)
C***ROUTINES CALLED  R1MACH, XERCLR, 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***END PROLOGUE  CTAN