# dcot.f

          DOUBLE PRECISION FUNCTION DCOT (X)
    C***BEGIN PROLOGUE  DCOT
    C***PURPOSE  Compute the cotangent.
    C***LIBRARY   SLATEC (FNLIB)
    C***CATEGORY  C4A
    C***TYPE      DOUBLE PRECISION (COT-S, DCOT-D, CCOT-C)
    C***KEYWORDS  COTANGENT, ELEMENTARY FUNCTIONS, FNLIB, TRIGONOMETRIC
    C***AUTHOR  Fullerton, W., (LANL)
    C***DESCRIPTION
    C
    C DCOT(X) calculates the double precision trigonometric cotangent
    C for double precision argument X.  X is in units of radians.
    C
    C Series for COT        on the interval  0.          to  6.25000E-02
    C                                        with weighted error   5.52E-34
    C                                         log weighted error  33.26
    C                               significant figures required  32.34
    C                                    decimal places required  33.85
    C
    C***REFERENCES  (NONE)
    C***ROUTINES CALLED  D1MACH, DCSEVL, INITDS, XERMSG
    C***REVISION HISTORY  (YYMMDD)
    C   770601  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   920618  Removed space from variable names.  (RWC, WRB)
    C***END PROLOGUE  DCOT