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<html>
<head>
<title>Class: GridData</title>
</head>
<body bgcolor="#ffffff">
<p><i><a href="../index.html">Table of Contents</a></i></p>
<table border="0" cellpadding="5" cellspacing="0" width="100%">
<tr bgcolor="#88bbee">
<th rowspan="2"
valign="top"
align="left"
width="10%"><font color="#000000">Class: GridData</font>
</th>
<th align="right"><font color="#000000">Gnuplot/PlotItems.py</font></th>
</tr>
<tr>
<td>
<dl><dt><p><strong>Holds data representing a function of two variables, for use in splot.</strong><p>
</dt><dd><p> <code>GridData</code> represents a function that has been tabulated on a
rectangular grid. The data are written to a file; no copy is kept
in memory.</p>
</dd></dl>
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<tr>
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<font color="#000000">
<a name="Base Classes">Base Classes</a>
</font>
</th>
<th bgcolor="#99ccff"
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>
<font color="#000000"> </font>
</th>
</tr>
<tr>
<td>
<a href="PlotItems.py_PlotItem.html">PlotItem</a><br>
</td>
</tr>
</table>
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<tr>
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<font color="#000000">
<a name="Methods">Methods</a>
</font>
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valign="top"
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>
<font color="#000000"> </font>
</th>
</tr>
<tr>
<td>
<a href="#__init__">__init__</a><br>
<a href="#pipein">pipein</a><br>
<tr>
<th bgcolor="#99ccff"
rowspan="2"
valign="top"
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width="20%"
>
<font color="#000000">
<a name="__init__"></a>
</font>
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>
<font color="#000000">__init__ </font>
</th>
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<tr>
<td>
<pre>
__init__ (
self,
data,
xvals=None,
yvals=None,
binary=1,
inline=_unset,
**keyw,
)
</pre><dl><dt><p><strong>GridData constructor.</strong><p>
</dt><dd><p> Arguments:</p>
<dl><dt> <code>data</code></dt><dd><p>the data to plot: a 2-d array with dimensions
(numx,numy).</p>
</dd>
<dt> <code>xvals</code></dt><dd><p>a 1-d array with dimension <code>numx</code></p>
</dd>
<dt> <code>yvals</code></dt><dd><p>a 1-d array with dimension <code>numy</code></p>
</dd>
<dt> <code>binary=<bool></code></dt><dd><p>send data to gnuplot in binary format?</p>
</dd>
<dt> <code>inline=<bool></code></dt><dd><p>send data to gnuplot "inline"?</p>
</dd></dl>
<p> Note the unusual argument order! The data are specified
<em>before</em> the x and y values. (This inconsistency was probably
a mistake; after all, the default xvals and yvals are not very
useful.)</p>
<p> <code>data</code> must be a data array holding the values of a function
f(x,y) tabulated on a grid of points, such that <code>data[i,j] ==
f(xvals[i], yvals[j])</code>. If <code>xvals</code> and/or <code>yvals</code> are
omitted, integers (starting with 0) are used for that
coordinate. The data are written to a temporary file; no copy
of the data is kept in memory.</p>
<p> If <code>binary=0</code> then the data are written to a datafile as <code>x y
f(x,y)</code> triplets (y changes most rapidly) that can be used by
gnuplot's <code>splot</code> command. Blank lines are included each time
the value of x changes so that gnuplot knows to plot a surface
through the data.</p>
<p> If <code>binary=1</code> then the data are written to a file in a binary
format that <code>splot</code> can understand. Binary format is faster
and usually saves disk space but is not human-readable. If
your version of gnuplot doesn't support binary format (it is a
recently-added feature), this behavior can be disabled by
setting the configuration variable
<code>gp.GnuplotOpts.recognizes_binary_splot=0</code> in the appropriate
gp*.py file.</p>
<p> Thus if you have three arrays in the above format and a
Gnuplot instance called g, you can plot your data by typing
<code>g.splot(Gnuplot.GridData(data,xvals,yvals))</code>.</p>
</dd></dl>
<tr>
<th bgcolor="#99ccff"
rowspan="2"
valign="top"
align="left"
width="20%"
>
<font color="#000000">
<a name="pipein"></a>
</font>
</th>
<th bgcolor="#99ccff"
valign="top"
align="left"
>
<font color="#000000">pipein </font>
</th>
</tr>
<tr>
<td>
<pre>
pipein ( self, f )
</pre><p>
<TABLE BORDER=1 CELLPADDING=2>
</TABLE></p>
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