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<div class="moz-cite-prefix">Interesting, thanks for reporting. I've
filed as bug #4959<br>
<br>
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charset=ISO-8859-1">
<a
href="https://r-forge.r-project.org/tracker/?group_id=240&atid=975&func=detail&aid=4959">https://r-forge.r-project.org/tracker/?group_id=240&atid=975&func=detail&aid=4959</a><br>
<br>
Matt<br>
<br>
On 30/09/13 21:06, Alexandre Sieira wrote:<br>
</div>
<blockquote
cite="mid:etPan.5249d9c8.238e1f29.7e54@MacBook-Pro-de-Alexandre-Sieira.local"
type="cite">
<div id="bloop_customfont"
style="font-family:Helvetica,Arial;font-size:13px; margin: 0px;
line-height: auto;">By the way, this works as I would expect
with data.frame on the same environment:</div>
<div id="bloop_customfont"
style="font-family:Helvetica,Arial;font-size:13px; margin: 0px;
line-height: auto;"><br>
</div>
<div id="bloop_customfont" style="margin: 0px; ">
<div id="bloop_customfont" style="margin: 0px; ">
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">> df1 = data.frame(a=character())</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">> df2 = data.frame(a=character())</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">> df1</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">[1] a</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New"><0 rows> (or row.names with
length 0)</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">> df2</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">[1] a</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New"><0 rows> (or row.names with
length 0)</font></div>
<div id="bloop_customfont" style="margin: 0px; "><span
style="font-family: 'Courier New'; ">> rbind(df1, df2)</span></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">[1] a</font></div>
<div id="bloop_customfont" style="margin: 0px; ">
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New"><0 rows> (or row.names with
length 0)</font></div>
<div><br>
</div>
</div>
</div>
</div>
<div class="" id="bloop_sign_1380571389894333952"><span
style="font-family:helvetica,arial;font-size:13px"></span>
<div style="font-family: Helvetica; line-height: normal; ">-- </div>
<div style="font-family: Helvetica; line-height: normal; "><span
style="font-family: arial; font-size: small; ">Alexandre
Sieira</span><br style="font-family: arial; font-size:
small; ">
<span style="font-family: arial; font-size: small; ">CISA,
CISSP, ISO 27001 Lead Auditor</span><br style="font-family:
arial; font-size: small; ">
<br style="font-family: arial; font-size: small; ">
<span style="font-family: arial; font-size: small; ">"The
truth is rarely pure and never simple."</span><br
style="font-family: arial; font-size: small; ">
<span style="font-family: arial; font-size: small; ">Oscar
Wilde, The Importance of Being Earnest, 1895, Act I</span></div>
</div>
<br>
<p style="color:#A0A0A8;">On 30 de setembro de 2013 at 13:01:47,
Alexandre Sieira (<a class="moz-txt-link-abbreviated" href="mailto:alexandre.sieira@gmail.com">alexandre.sieira@gmail.com</a>) wrote:</p>
<blockquote type="cite"
style="border-left-style:solid;border-width:1px;margin-left:0px;padding-left:10px;"><span>
<div style="word-wrap: break-word; -webkit-nbsp-mode: space;
-webkit-line-break: after-white-space; ">
<div id="bloop_customfont"
style="font-family:Helvetica,Arial;font-size:13px; margin:
0px; line-height: auto;">I encountered the following
behavior with data.table 1.8.10 on R 3.0.2 on Mac OS X and
was wondering if that is expected:</div>
<div id="bloop_customfont"
style="font-family:Helvetica,Arial;font-size:13px; margin:
0px; line-height: auto;"><br>
</div>
<div id="bloop_customfont" style="margin: 0px; ">
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">> dt1 =
data.table(a=character())</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">> dt2 =
data.table(a=character())</font></div>
<div id="bloop_customfont" style="margin: 0px; ">
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">> dt1</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">Empty data.table (0 rows) of 1
col: a</font></div>
<div id="bloop_customfont" style="margin: 0px; "><span
style="font-family: 'Courier New'; ">>
colnames(dt1)</span></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">[1] "a"</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">> dt2</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">Empty data.table (0 rows) of 1
col: a</font></div>
<div id="bloop_customfont" style="margin: 0px; "><span
style="font-family: 'Courier New'; ">>
colnames(dt2)</span></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">[1] "a"</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">> rbind(dt1, dt2)</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">Error in setnames(ret,
nm.original) : x has no column names</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New"><br>
</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">Enter a frame number, or 0 to
exit </font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New"><br>
</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">1: rbind(dt1, dt2)</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">2: rbind(deparse.level, ...)</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">3:
data.table::.rbind.data.table(...)</font></div>
<div id="bloop_customfont" style="margin: 0px; "><font
face="Courier New">4: setnames(ret, nm.original)</font></div>
<div id="bloop_customfont" style="margin: 0px; "><br>
</div>
<div id="bloop_customfont" style="margin: 0px; ">
<div id="bloop_customfont" style="font-family:
Helvetica, Arial; font-size: 13px; margin: 0px; ">If
I rbind two zero-row data.table objects with
matching column names, I would have expected to get
a zero-row data.table back (0 + 0 = 0, after all).</div>
</div>
</div>
</div>
<br>
<div class="" id="bloop_sign_1380571025722400000"><span
style="font-family:helvetica,arial;font-size:13px"></span>
<div style="font-family: Helvetica; line-height: normal; ">-- </div>
<div style="font-family: Helvetica; line-height: normal; "><span
style="font-family: arial; font-size: small; ">Alexandre
Sieira</span><br style="font-family: arial; font-size:
small; ">
<span style="font-family: arial; font-size: small; ">CISA,
CISSP, ISO 27001 Lead Auditor</span><br
style="font-family: arial; font-size: small; ">
<br style="font-family: arial; font-size: small; ">
<span style="font-family: arial; font-size: small; ">"The
truth is rarely pure and never simple."</span><br
style="font-family: arial; font-size: small; ">
<span style="font-family: arial; font-size: small; ">Oscar
Wilde, The Importance of Being Earnest, 1895, Act I</span></div>
</div>
</div>
</span></blockquote>
<br>
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<br>
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</blockquote>
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