trings.</p></dd>


<dt>na</dt>
<dd><p>Character scalar or <code>NA</code>. Default is "NA" (a character string!). What happens to NAs: by default
they are replaced by the character string "NA".</p></dd>

</dl></div>
    <div id="details">
    <h2>Details</h2>
    <p>If you use character filling of the form <code>sprintf("% 20s", x)</code> with <code>x``containing multibyte characters, you may be suprised that all character strings do not end up at the same lenght (the occurrence of this problem depends on m