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<H2><A NAME="SECTION0402455000000000000000"></A>
<A NAME="commands_set_polar"></A><A NAME="commands_unset_polar"></A><A NAME="commands_show_polar"></A><A NAME="set_polar"></A><A NAME="unset_polar"></A><A NAME="show_polar"></A><A NAME="polar"></A><A NAME="6083"></A>
<A NAME="nopolar"></A><A NAME="6085"></A>
<BR>
Polar
</H2>
The <B>set polar</B> command changes the meaning of the plot from rectangular
coordinates to polar coordinates.
<P>
Syntax:
<BR>
<PRE>
set polar
unset polar
show polar
</PRE>
<BR>
<P>
In polar coordinates, the dummy variable (t) is an angle. The default range
of t is [0:2*pi], or, if degree units have been selected, to [0:360] (see
<B>set angles (p. <A HREF="node176.html#set_angles"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="6090"></A></B>).
<P>
The command <B>unset polar</B> changes the meaning of the plot back to the default
rectangular coordinate system.
<P>
The <B>set polar</B> command is not supported for <B>splot</B>s. See the <B>set mapping (p. <A HREF="node225.html#set_mapping"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="6095"></A></B>
command for similar functionality for <B>splot (p. <A HREF="node335.html#splot"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="6097"></A></B>s.
<P>
While in polar coordinates the meaning of an expression in t is really
r = f(t), where t is an angle of rotation. The trange controls the domain
(the angle) of the function, and the x and y ranges control the range of the
graph in the x and y directions. Each of these ranges, as well as the
rrange, may be autoscaled or set explicitly. Ffor details of all the <B>ranges</B>
commands, see <B>set xrange (p. <A HREF="node299.html#set_xrange"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="6100"></A></B>.
<P>
Example:
<BR>
<PRE>
set polar
plot t*sin(t)
plot [-2*pi:2*pi] [-3:3] [-3:3] t*sin(t)
</PRE>
<BR>
<P>
The first <B>plot</B> uses the default polar angular domain of 0 to 2*pi. The
radius and the size of the graph are scaled automatically. The second <B>plot</B>
expands the domain, and restricts the size of the graph to [-3:3] in both
directions.
<P>
You may want to <B>set size square</B> to have <B>gnuplot</B> try to make the aspect
ratio equal to unity, so that circles look circular.
See also
<P>
http://www.gnuplot.info/demo/polar.html<TT>polar demos (polar.dem)
</TT>
<P>
and
<P>
http://www.gnuplot.info/demo/poldat.html<TT>polar data plot (poldat.dem).
</TT>
<P>
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<ADDRESS>
2010-08-17
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