eval.quoted

if TRUE, return <code>NULL</code> if evaluation unsuccesful

expr

Evaluates quoted variables in specified environment

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'.

eval.quoted: Evaluate a quoted list of variables.

Description

Usage

Arguments

Value