GNUPlot Manual

52 gnuplot 4.0 36 SET-SHOW
36 Set-show
The set command can be used to set lots of options. No screen is drawn, however, until a plot, splot,
or replot command is given.
The show command shows their settings; show all shows all the settings.
Options changed using set can be returned to the default state by giving the corresponding unset
command. See also the reset (p. 51) command, which returns all settable parameters to default values.
If a variable contains time/date data, show will display it according to the format currently defined by
set timefmt, even if that was not in effect when the variable was initially defined.
36.1 Angles
By default, gnuplot assumes the independent variable in polar graphs 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 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}
See also
poldat.dem:
polar plot using set angles demo.
36.2 Arrow
Arbitrary arrows can be placed on a plot using the set arrow command.
Syntax:
set arrow {} {from } {to|rto }
{ {arrowstyle | as }
| {nohead | head | heads}
{size ,}
{filled | nofilled}
{front | back}
{ {linestyle | ls }
| {linetype | lt }