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<table width="100%" summary="page for Krig.null.function {fields}"><tr><td>Krig.null.function {fields}</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Default function to create fixed matrix part of spatial process model.</h2>

<h3>Description</h3>

<p>Constructs a matrix of terms representing a low order polynomial 
and binds additional columns due to covariates ( the Z matrix)
</p>


<h3>Usage</h3>

<pre>
Krig.null.function(x, Z = NULL, drop.Z = FALSE, m)
</pre>


<h3>Arguments</h3>

<table summary="R argblock">
<tr valign="top"><td><code>x</code></td>
<td>
<p>Spatial locations </p>
</td></tr>
<tr valign="top"><td><code>Z</code></td>
<td>
<p> Other covariates to be associated with each location.</p>
</td></tr>
<tr valign="top"><td><code>drop.Z</code></td>
<td>
<p>If TRUE only the low order polynomial part is created.  </p>
</td></tr>
<tr valign="top"><td><code>m</code></td>
<td>
<p> The polynomial order is (m-1). </p>
</td></tr>
</table>


<h3>Details</h3>

<p>This function can be modified to produce a different fixed part of the 
spatial model. The arguments x, Z and drop.Z are required but other arguments
can  be passed as part of a list in null.args  in the call to Krig. 
</p>


<h3>Value</h3>

<p>A matrix where the first columns are the polynomial terms and the
following columns are from Z. 
</p>


<h3>Author(s)</h3>

<p>Doug Nychka </p>


<h3>See Also</h3>

<p>Krig</p>

<hr /><div style="text-align: center;">[Package <em>fields</em> version 9.9 <a href="00Index.html">Index</a>]</div>
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