try_default

tryNULL

<code>try_default</code> wraps try so that it returns a default value in the case of error.
<code>tryNULL</code> provides a useful special case when dealing with lists.

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

try_default function

<dl><dt>expr</dt>
<dd>expression to try</dd>
<dt>default</dt>
<dd>default value in case of error</dd>
<dt>quiet</dt>
<dd>should errors be printed (TRUE) or ignored (FALSE, default)</dd></dl>

Arguments

Try, with default in case of error. — try_default

<dl>

<dt>expr</dt>
<dd>expression to try</dd>


<dt>default</dt>
<dd>default value in case of error</dd>


<dt>quiet</dt>
<dd>should errors be printed (TRUE) or ignored (FALSE, default)</dd>

</dl>

try_default: Try, with default in case of error.

Description

Usage

Arguments

See Also