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<H3><A NAME="SECTION040142600000000000000"></A>
<A NAME="commands_plot_datafile_smooth"></A><A NAME="plot_datafile_smooth"></A><A NAME="plot_smooth"></A><A NAME="data-file_smooth"></A><A NAME="datafile_smooth"></A><A NAME="smooth"></A><A NAME="2946"></A>
<BR>
Smooth
</H3>
<B>gnuplot</B> includes a few general-purpose routines for interpolation and
approximation of data; these are grouped under the <B>smooth</B> option. More
sophisticated data processing may be performed by preprocessing the data
externally or by using <B>fit</B> with an appropriate model.
<P>
Syntax:
<BR>
<PRE>
smooth {unique | frequency | cumulative | kdensity | csplines | acsplines | bezier | sbezier}
</PRE>
<BR>
<P>
<B>unique</B>, <B>frequency</B>, and <B>cumulative</B> plot the data after making them
monotonic. Each of the other routines uses the data to determine the
coefficients of a continuous curve between the endpoints of the data.
This curve is then plotted in the same manner as a function, that is,
by finding its value at uniform intervals along the abscissa
(see <B>set samples (p. <A HREF="node259.html#set_samples"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="2956"></A></B>) and connecting these points with straight line
segments (if a line style is chosen).
<P>
If <B>autoscale</B> is in effect, the ranges will be computed such that the
plotted curve lies within the borders of the graph.
<P>
If <B>autoscale</B> is not in effect, and the smooth option is either <B>acspline</B>
or <B>cspline</B>, the sampling of the generated curve is
done across the intersection of the x range covered by the input data and
the fixed abscissa range as defined by <B>set xrange</B>.
<P>
If too few points are available to allow the selected option to be applied,
an error message is produced. The minimum number is one for <B>unique</B> and
<B>frequency</B>, four for <B>acsplines</B>, and three for the others.
<P>
The <B>smooth</B> options have no effect on function plots.
<BR><HR>
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<UL>
<LI><A NAME="tex2html3090"
HREF="node141.html">Acsplines</A>
<LI><A NAME="tex2html3091"
HREF="node142.html">Bezier</A>
<LI><A NAME="tex2html3092"
HREF="node143.html">Csplines</A>
<LI><A NAME="tex2html3093"
HREF="node144.html">Sbezier</A>
<LI><A NAME="tex2html3094"
HREF="node145.html">Unique</A>
<LI><A NAME="tex2html3095"
HREF="node146.html">Frequency</A>
<LI><A NAME="tex2html3096"
HREF="node147.html">Cumulative</A>
<LI><A NAME="tex2html3097"
HREF="node148.html">Kdensity</A>
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2010-08-17
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