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<H2><A NAME="SECTION040144000000000000000"></A>
<A NAME="commands_plot_errorlines"></A><A NAME="commands_splot_errorlines"></A><A NAME="plot_errorlines"></A><A NAME="splot_errorlines"></A><A NAME="errorlines"></A><A NAME="3314"></A>
<BR>
Errorlines
</H2>
Lines with error bars are supported for 2D data file plots by reading
one to four additional columns (or <B>using</B> entries); these additional
values are used in different ways by the various errorlines styles.
<P>
In the default situation, <B>gnuplot</B> expects to see three, four, or six
numbers on each line of the data file -- either
<P>
<BR>
<PRE>
(x, y, ydelta),
(x, y, ylow, yhigh),
(x, y, xdelta),
(x, y, xlow, xhigh),
(x, y, xdelta, ydelta), or
(x, y, xlow, xhigh, ylow, yhigh).
</PRE>
<BR>
<P>
The x coordinate must be specified. The order of the numbers must be
exactly as given above, though the <B>using</B> qualifier can manipulate
the order and provide values for missing columns. For example,
<P>
<BR>
<PRE>
plot 'file' with errorlines
plot 'file' using 1:2:(sqrt($1)) with xerrorlines
plot 'file' using 1:2:($1-$3):($1+$3):4:5 with xyerrorlines
</PRE>
<BR>
<P>
The last example is for a file containing an unsupported combination
of relative x and absolute y errors. The <B>using</B> entry generates
absolute x min and max from the relative error.
<P>
The y error bar is a vertical line plotted from (x, ylow) to (x,
yhigh). If ydelta is specified instead of ylow and yhigh, ylow = y -
ydelta and yhigh = y + ydelta are derived. If there are only two
numbers on the record, yhigh and ylow are both set to y. The x error
bar is a horizontal line computed in the same fashion.
<P>
The error bars have crossbars at each end unless <B>set bars</B> is used
(see <B>set bars (p. <A HREF="node181.html#set_bars"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="3325"></A></B> for details).
<P>
If autoscaling is on, the ranges will be adjusted to include the error bars.
<P>
See <B>plot using (p. <A HREF="node151.html#plot_using"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="3327"></A></B>, <B>plot with (p. <A HREF="node165.html#plot_with"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="3329"></A></B>, and <B>set style (p. <A HREF="node261.html#set_style"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="3331"></A></B> for more information.
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2010-08-17
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