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}
set angles degrees y=sinh(x) print y #prints {1.16933, 0.154051} print asinh(y) #prints {57.29578, 5.729578}
http://www.gnuplot.info/demo/poldat.htmlpoldat.dem: polar plot using set angles demo.