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<title>Class: GridData</title>
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width="10%"><font color="#000000">Class: GridData</font>
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<th align="right"><font color="#000000">./PlotItems.py</font></th>
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<dl><dt><p><strong>Holds data representing a function of two variables, for use in splot.</strong><p>
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</dt><dd><p> <code>GridData</code> represents a function that has been tabulated on a
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rectangular grid. The data are written to a file; no copy is kept
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<a name="Base Classes">Base Classes</a>
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<font color="#000000"> </font>
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<a href="PlotItems.py_PlotItem.html">PlotItem</a><br>
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<font color="#000000">
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<a name="Methods">Methods</a>
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<font color="#000000"> </font>
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<a href="#__init__">__init__</a><br>
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<a href="#pipein">pipein</a><br>
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<a name="__init__"></a>
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<font color="#000000">__init__ </font>
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</pre><dl><dt><p><strong>GridData constructor.</strong><p>
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</dt><dd><p> Arguments:</p>
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<dl><dt> <code>data</code></dt><dd><p>the data to plot: a 2-d array with dimensions
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<dt> <code>xvals</code></dt><dd><p>a 1-d array with dimension <code>numx</code></p>
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<dt> <code>yvals</code></dt><dd><p>a 1-d array with dimension <code>numy</code></p>
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<dt> <code>binary=<bool></code></dt><dd><p>send data to gnuplot in binary format?</p>
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<dt> <code>inline=<bool></code></dt><dd><p>send data to gnuplot "inline"?</p>
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<p> Note the unusual argument order! The data are specified
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<em>before</em> the x and y values. (This inconsistency was probably
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a mistake; after all, the default xvals and yvals are not very
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<p> <code>data</code> must be a data array holding the values of a function
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f(x,y) tabulated on a grid of points, such that <code>data[i,j] ==
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f(xvals[i], yvals[j])</code>. If <code>xvals</code> and/or <code>yvals</code> are
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omitted, integers (starting with 0) are used for that
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coordinate. The data are written to a temporary file; no copy
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of the data is kept in memory.</p>
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<p> If <code>binary=0</code> then the data are written to a datafile as <code>x y
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f(x,y)</code> triplets (y changes most rapidly) that can be used by
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gnuplot's <code>splot</code> command. Blank lines are included each time
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the value of x changes so that gnuplot knows to plot a surface
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through the data.</p>
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<p> If <code>binary=1</code> then the data are written to a file in a binary
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format that <code>splot</code> can understand. Binary format is faster
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and usually saves disk space but is not human-readable. If
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your version of gnuplot doesn't support binary format (it is a
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recently-added feature), this behavior can be disabled by
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setting the configuration variable
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<code>gp.GnuplotOpts.recognizes_binary_splot=0</code> in the appropriate
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<p> Thus if you have three arrays in the above format and a
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Gnuplot instance called g, you can plot your data by typing
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<code>g.splot(Gnuplot.GridData(data,xvals,yvals))</code>.</p>
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<i>This document was automatically generated on Fri Jan 26 13:13:18 2001
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