catan.f
COMPLEX FUNCTION CATAN (Z)
C***BEGIN PROLOGUE CATAN
C***PURPOSE Compute the complex arc tangent.
C***LIBRARY SLATEC (FNLIB)
C***CATEGORY C4A
C***TYPE COMPLEX (CATAN-C)
C***KEYWORDS ARC TANGENT, ELEMENTARY FUNCTIONS, FNLIB, TRIGONOMETRIC
C***AUTHOR Fullerton, W., (LANL)
C***DESCRIPTION
C
C CATAN(Z) calculates the complex trigonometric arc tangent of Z.
C The result is in units of radians, and the real part is in the first
C or fourth quadrant.
C
C***REFERENCES (NONE)
C***ROUTINES CALLED R1MACH, XERMSG
C***REVISION HISTORY (YYMMDD)
C 770801 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 CATAN