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<table width="100%" summary="page for trmat {spatial}"><tr><td>trmat {spatial}</td><td align="right">R Documentation</td></tr></table>
<h2>Evaluate Trend Surface over a Grid</h2>


<h3>Description</h3>

<p>
Evaluate trend surface over a grid.
</p>


<h3>Usage</h3>

<pre>
trmat(obj, xl, xu, yl, yu, n)
</pre>


<h3>Arguments</h3>

<table summary="R argblock">
<tr valign="top"><td><code>obj</code></td>
<td>
object returned by <code>surf.ls</code> or <code>surf.gls</code>
</td></tr>
<tr valign="top"><td><code>xl</code></td>
<td>
limits of the rectangle for grid
</td></tr>
<tr valign="top"><td><code>xu</code></td>
<td>
</td></tr>
<tr valign="top"><td><code>yl</code></td>
<td>
</td></tr>
<tr valign="top"><td><code>yu</code></td>
<td>
</td></tr>
<tr valign="top"><td><code>n</code></td>
<td>
use <code>n</code>  x  <code>n</code> grid within the rectangle
</td></tr>
</table>

<h3>Value</h3>

<p>
list with components <code>x</code>, <code>y</code> and <code>z</code> suitable for <code>contour</code> and <code>image</code>.</p>

<h3>References</h3>

<p>
Ripley, B. D. (1981) <EM>Spatial Statistics.</EM> Wiley.
</p>
<p>
Venables, W. N. and Ripley, B. D. (2002)
<EM>Modern Applied Statistics with S.</EM> Fourth edition.  Springer.
</p>


<h3>See Also</h3>

<p>
<code><a href="surf.ls.html">surf.ls</a></code>, <code><a href="surf.gls.html">surf.gls</a></code>
</p>


<h3>Examples</h3>

<pre>
data(topo, package="MASS")
topo.kr &lt;- surf.ls(2, topo)
trsurf &lt;- trmat(topo.kr, 0, 6.5, 0, 6.5, 50)
</pre>



<hr><div align="center">[Package <em>spatial</em> version 7.2-44 <a href="00Index.html">Index]</a></div>

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