updatelist

Update a list, but don't create new entries

internal

Flexibly restructure and aggregate data using
just two functions: melt and cast.

Hadley Wickham &lt;h.wickham@gmail.com&gt;

<dl><dt>x</dt>
<dd>list to be updated</dd><dt>y</dt>
<dd>list with updated values</dd></dl>

<dl>

<dt>x</dt>
<dd>list to be updated</dd>

<dt>y</dt>
<dd>list with updated values</dd>

</dl>