nunique

Calculate number of unique values of a variable as efficiently as possible.

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

nunique function

<dl><dt>x</dt>
<dd>vector</dd></dl>

Arguments

Number of unique values. — nunique

<dl>

<dt>x</dt>
<dd>vector</dd>

</dl>

nunique: Number of unique values.

Description

Usage

Arguments