


      ATAN2(3F)                   (UNIX 5.0)                  ATAN2(3F)



      NAME
           atan2, datan2 - Fortran arctangent intrinsic function

      SYNTAX
           real r1, r2, r3
           double precision dp1, dp2, dp3

           r3 = atan2(r1, r2)

           dp3 = datan2(dp1, dp2)
           dp3 = atan2(dp1, dp2)

      DESCRIPTION
           Atan2 returns the arctangent of arg1/arg2, in real or
           double-precision type that matches the arguments.

           Datan2 returns the double-precision arctangent of the
           double-precsion arguments arg1/arg2.

           Although Atan2 works for either data type, datan is for
           clarity in programming.

      SEE ALSO
           trig(3M).































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