join.keys

Join keys.
Given two data frames, create a unique key for each row.

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

join.keys function

<dl><dt>x</dt>
<dd>data frame</dd>
<dt>y</dt>
<dd>data frame</dd>
<dt>by</dt>
<dd>character vector of variable names to join by</dd></dl>

Arguments

Join keys.
Given two data frames, create a unique key for each row. — join.keys

<dl>

<dt>x</dt>
<dd>data frame</dd>


<dt>y</dt>
<dd>data frame</dd>


<dt>by</dt>
<dd>character vector of variable names to join by</dd>

</dl>

join.keys: Join keys. Given two data frames, create a unique key for each row.

Description

Usage

Arguments