ninteraction

Properties:<ul>
<li><code>order(id)</code> is equivalent to <code>do.call(order, df)</code></li>
<li>rows containing the same data have the same value</li>
<li>if <code>drop = FALSE</code> then room for all possibilites</li>
</ul>

internal

A set of tools that solves a common set of problems: you need
to break a big problem down into manageable pieces, operate on each
piece and then put all the pieces back together.  For example, you
might want to fit a model to each spatial location or time point in
your study, summarise data by panels or collapse high-dimensional
arrays to simpler summary statistics. The development of 'plyr' has
been generously supported by 'Becton Dickinson'.

Hadley Wickham

plyr

Tools for Splitting, Applying and Combining Data

id function

<dl><dt>.variables</dt>
<dd>list of variables</dd>
<dt>drop</dt>
<dd>drop unusued factor levels?</dd></dl>

Arguments

Compute a unique numeric id for each unique row in a data frame. — id

<dl>

<dt>.variables</dt>
<dd>list of variables</dd>


<dt>drop</dt>
<dd>drop unusued factor levels?</dd>

</dl>

id: Compute a unique numeric id for each unique row in a data frame.

Description

Usage

Value

Arguments

See Also