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<H1><A NAME="SECTION02090000000000000000"></A>
<A NAME="coordinates"></A><A NAME="310"></A>
<A NAME="311"></A>
<BR>
Coordinates
</H1>
The commands <B>set arrow</B>, <B>set key</B>, <B>set label</B> and <B>set object</B> allow you
to draw something at an arbitrary position on the graph. This position is
specified by the syntax:
<P>
<BR>
<PRE>
{<system>} <x>, {<system>} <y> {,{<system>} <z>}
</PRE>
<BR>
<P>
Each 4#4system5#5 can either be <B>first</B>, <B>second</B>, <B>graph</B>, <B>screen</B>, or
<B>character</B>.
<P>
<B>first</B> places the x, y, or z coordinate in the system defined by the left
and bottom axes; <B>second</B> places it in the system defined by the second axes
(top and right); <B>graph</B> specifies the area within the axes -- 0,0 is bottom
left and 1,1 is top right (for splot, 0,0,0 is bottom left of plotting area;
use negative z to get to the base -- see <B>set xyplane (p. <A HREF="node303.html#set_xyplane"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="327"></A></B>); <B>screen</B>
specifies the screen area (the entire area -- not just the portion selected by
<B>set size</B>), with 0,0 at bottom left and 1,1 at top right; and <B>character</B>
gives the position in character widths and heights from the bottom left of
the screen area (screen 0,0), <B>character</B> coordinates depend on the chosen
font size.
<P>
If the coordinate system for x is not specified, <B>first</B> is used. If the
system for y is not specified, the one used for x is adopted.
<P>
In some cases, the given coordinate is not an absolute position but a
relative value (e.g., the second position in <B>set arrow</B> ... <B>rto</B>). In
most cases, the given value serves as difference to the first position.
If the given coordinate resides in a logarithmic axis the value is
interpreted as factor. For example,
<P>
<BR>
<PRE>
set logscale x
set arrow 100,5 rto 10,2
</PRE>
<BR>
<P>
plots an arrow from position 100,5 to position 1000,7 since the x axis is
logarithmic while the y axis is linear.
<P>
If one (or more) axis is timeseries, the appropriate coordinate should
be given as a quoted time string according to the <B>timefmt</B> format string.
See <B>set xdata (p. <A HREF="node295.html#set_xdata"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="339"></A></B> and <B>set timefmt (p. <A HREF="node278.html#set_timefmt"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="341"></A></B>. <B>Gnuplot</B> will also accept an integer
expression, which will be interpreted as seconds from 1 January 2000.
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2010-08-17
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