con2tr

<p>A list of components <code>x</code>, <code>y</code> and <code>z</code> as passed to
    <code>contour</code>.</p>

<p>Convert lists to data frames for use by lattice.</p>

misc

Functions and datasets to support Venables and Ripley,
"Modern Applied Statistics with S" (4th edition, 2002).