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<H3><A NAME="SECTION040261300000000000000"></A>
<A NAME="commands_plot_datafile_matrix_ascii"></A><A NAME="commands_splot_datafile_matrix_ascii"></A><A NAME="plot_datafile_matrix_ascii"></A><A NAME="splot_datafile_matrix_ascii"></A><A NAME="plot_matrix_ascii"></A><A NAME="splot_matrix_ascii"></A><A NAME="data-file_matrix_ascii"></A><A NAME="datafile_matrix_ascii"></A><A NAME="matrix_ascii"></A>
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Matrix_ascii
</H3>
The <B>matrix</B> keyword (without a sequent <B>binary</B> keyword) in
<BR>
<PRE>
{s}plot 'a.dat' matrix
</PRE>
<BR>
indicates that data are stored in an ascii numbers matrix format.
<P>
The z-values are read in a row at a time, i. e.,
<BR>
<PRE>
z11 z12 z13 z14 ...
z21 z22 z23 z24 ...
z31 z32 z33 z34 ...
</PRE>
<BR>
and so forth.
<P>
In 3D, the x- and y-indices of the matrix surface plot correspond to column
and row indices of the matrix, respectively, being enumerated from 0. You can
rescale or transform the axes as usual for a data file with three columns
by means of x=$1, y=$2, z=$3. For example
<BR>
<PRE>
splot 'a.dat' matrix using (1+$1/100):(1+$2*10):3
</PRE>
<BR>
<P>
A blank line or comment line ends the matrix, and starts a new surface mesh.
You can select among the meshes inside a file by the <B>index</B> option to the
<B>splot</B> command, as usual.
<P>
See <B>matrix (p. <A HREF="node340.html#matrix"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)<A NAME="7776"></A></B> for examples of plotting rows and columns of the matrix in
a 2D plot.
<BR><HR>
<ADDRESS>
2010-08-17
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