EVOLUTION-MANAGER

Edit File: update.trellis.html

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<table width="100%" summary="page for C_06_update.trellis {lattice}"><tr><td>C_06_update.trellis {lattice}</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Retrieve and Update Trellis Object</h2>

<h3>Description</h3>

<p>Update method for objects of class <code>"trellis"</code>, and a way to retrieve
the last printed trellis object (that was saved).
</p>

<h3>Usage</h3>

<pre>
## S3 method for class 'trellis'
update(object,
       panel,
       aspect,
       as.table,
       between,
       key,
       auto.key,
       legend,
       layout,
       main,
       page,
       par.strip.text,
       prepanel,
       scales,
       skip,
       strip,
       strip.left,
       sub,
       xlab,
       ylab,
       xlab.top,
       ylab.right,
       xlim,
       ylim,
       xscale.components,
       yscale.components,
       axis,
       par.settings,
       plot.args,
       lattice.options,
       index.cond,
       perm.cond,
       ...)

## S3 method for class 'trellis'
t(x)

## S3 method for class 'trellis'
x[i, j, ..., drop = FALSE]

trellis.last.object(..., prefix)

</pre>

<h3>Arguments</h3>

<table summary="R argblock">
<tr valign="top"><td><code>object, x</code></td>
<td>

<p>The object to be updated, of class <code>"trellis"</code>.
</p>
</td></tr>
<tr valign="top"><td><code>i, j</code></td>
<td>
<p> indices to be used.  Names are not currently allowed. </p>
</td></tr>
<tr valign="top"><td><code>drop</code></td>
<td>

<p>logical, whether dimensions with only one level are to be dropped.
Currently ignored, behaves as if it were <code>FALSE</code>.
</p>
</td></tr>
</table>

<table summary="R argblock">
<tr valign="top"><td><code>panel, aspect, as.table, between, key, auto.key, legend, layout,
main, page, par.strip.text, prepanel, scales, skip, strip,
strip.left, sub, xlab, ylab, xlab.top, ylab.right, xlim, ylim,
xscale.components, yscale.components, axis, par.settings, plot.args,
lattice.options, index.cond, perm.cond, ...</code></td>
<td>

<p>arguments that will be used to update <code>object</code>. See details
below. 
</p>
</td></tr>
<tr valign="top"><td><code>prefix</code></td>
<td>

<p>A character string acting as a prefix identifying the plot of a
<code>"trellis"</code> object.  Only relevant when a particular page is
occupied by more than one plot.  Defaults to the value appropriate
for the last <code>"trellis"</code> object printed.  See
<code><a href="interaction.html">trellis.focus</a></code>.
</p>
</td></tr>
</table>

<h3>Details</h3>

<p>All high level lattice functions such as <code>xyplot</code> produce an
object of (S3) class <code>"trellis"</code>, which is usually displayed by its
<code>print</code> method. However, the object itself can be manipulated and
modified to a large extent using the <code>update</code> method, and then
re-displayed as needed.
</p>
<p>Most arguments to high level functions can also be supplied to the
<code>update</code> method as well, with some exceptions. Generally
speaking, anything that would needs to change the data within each
panel is a no-no (this includes the <code>formula, data, groups,
    subscripts</code> and <code>subset</code>). Everything else is technically game,
though might not be implemented yet. If you find something missing
that you wish to have, feel free to make a request.
</p>
<p>Not all arguments accepted by a Lattice function are processed by
<code>update</code>, but the ones listed above should work.  The purpose of
these arguments are described in the help page for
<code><a href="xyplot.html">xyplot</a></code>.  Any other argument is added to the list of
arguments to be passed to the <code>panel</code> function. Because of their
somewhat special nature, updates to objects produced by <code>cloud</code>
and <code>wireframe</code> do not work very well yet.
</p>
<p>The <code>"["</code> method is a convenient shortcut for updating
<code>index.cond</code>.  The <code>t</code> method is a convenient shortcut for
updating <code>perm.cond</code> in the special (but frequent) case where
there are exactly two conditioning variables, when it has the effect
of switching (&lsquo;transposing&rsquo;) their order.
</p>
<p>The print method for <code>"trellis"</code> objects optionally saves the
object after printing it.  If this feature is enabled,
<code>trellis.last.object</code> can retrieve it.  By default, the last
object plotted is retrieved, but if multiple objects are plotted on
the current page, then others can be retrieved using the appropriate
<code>prefix</code> argument.  If <code><a href="update.trellis.html">trellis.last.object</a></code> is
called with arguments, these are used to update the retrieved object
before returning it.
</p>

<h3>Value</h3>

<p>An object of class <code>trellis</code>, by default plotted by
<code>print.trellis</code>.  <code>trellis.last.object</code> returns
<code>NULL</code> is no saved object is available.
</p>

<h3>Author(s)</h3>

<p> Deepayan Sarkar <a href="mailto:Deepayan.Sarkar@R-project.org">Deepayan.Sarkar@R-project.org</a></p>

<p><code><a href="trellis.object.html">trellis.object</a></code>, <code><a href="Lattice.html">Lattice</a></code>,
<code><a href="xyplot.html">xyplot</a></code>
</p>

<h3>Examples</h3>

<pre>
spots &lt;- by(sunspots, gl(235, 12, labels = 1749:1983), mean)
old.options &lt;- lattice.options(save.object = TRUE)
xyplot(spots ~ 1749:1983, xlab = "", type = "l",
       scales = list(x = list(alternating = 2)),
       main = "Average Yearly Sunspots")
update(trellis.last.object(), aspect = "xy")
trellis.last.object(xlab = "Year")
lattice.options(old.options)
</pre>

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