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(gnuplot.info)angles

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 By default, `gnuplot` (Note: gnuplot ) assumes the independent variable in
 polar graphs is in units of radians.  If `set angles degrees` is specified
 before `set polar` (Note: polar ), then the default range is [0:360] and the
 independent variable has units of degrees.  This is particularly useful for
 plots of data files.  The angle setting also applies to 3-d mapping as set via
 the `set mapping` (Note: mapping ) command.

 Syntax:
       set angles {degrees | radians}
       show angles

 The angle specified in `set grid polar` is also read and displayed in the
 units specified by `set angles`.

 `set angles` also affects the arguments of the machine-defined functions
 sin(x), cos(x) and tan(x), and the outputs of asin(x), acos(x), atan(x),
 atan2(x), and arg(x).  It has no effect on the arguments of hyperbolic
 functions or Bessel functions.  However, the output arguments of inverse
 hyperbolic functions of complex arguments are affected; if these functions
 are used, `set angles radians` must be in effect to maintain consistency
 between input and output arguments.

       x={1.0,0.1}
       set angles radians
       y=sinh(x)
       print y         #prints {1.16933, 0.154051}
       print asinh(y)  #prints {1.0, 0.1}
 but
       set angles degrees
       y=sinh(x)
       print y         #prints {1.16933, 0.154051}
       print asinh(y)  #prints {57.29578, 5.729578}