atan(3F)                                                 atan(3F)



     NAME
          atan, datan - FORTRAN arctangent intrinsic function

     SYNOPSIS
          real r1, r2
          double precision dp1, dp2

          r2 = atan(r1)

          dp2 = datan(dp1)
          dp2 = atan(dp1)

     DESCRIPTION
          atan returns the real arctangent of its real argument.
          datan returns the double-precision arctangent of its
          double-precision argument.  The generic form atan may be
          used with a double-precision argument returning a double-
          precision value.

     SEE ALSO
          trig(3M).


































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