Angles

By default, gnuplot assumes the independent variable in polar plots is in units of radians. If set angles degrees is specified before set 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 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 has no effect on the arguments of machine-defined functions (sin(x), cosh(x), besj0(x), etc.); neither does it affect the result of inverse trigonometric functions, e.g. atan(x). These are always given in radians.