<div dir="ltr">Not having to type `DT` twice would increase readability/reduce errors, especially that real-life data.tables have much longer names. There was a related FR to this which suggested incorporating regex and wildcard syntax - not sure what happened to it.</div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 10, 2015 at 3:45 PM, Arunkumar Srinivasan <span dir="ltr"><<a href="mailto:aragorn168b@gmail.com" target="_blank">aragorn168b@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div><p>Mel,</p>
<p>The usage would be something like:</p>
<pre><code>DT[, from:to, with=FALSE]
# or
DT[, .SD, .SDcols = from:to]
</code></pre>
<p>where <code>from</code> and <code>to</code> are the start and end column names. I agree there’s no real advantage in terms of typing/prone to errors.</p>
<p>There might be some merit in readability, as people normally remember column names and not numbers… And this allows you to refer to the names directly without having to type <code>DT</code> and then look up the column or use a <code>match()</code> to find out the column programatically or do:</p>
<pre><code>DT[, .SD, .SDcols = names(DT)[some_idx]]
</code></pre><span class="HOEnZb"><font color="#888888">
<p></p></font></span></div><div><span class="HOEnZb"><font color="#888888"><div style="font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px;line-height:auto"><br></div> <br> <div><div style="font-family:helvetica,arial;font-size:13px">-- <br>Arun</div></div></font></span><div><div class="h5"> <br><p style="color:#000">On 10 Feb 2015 at 22:39:14, Bacou, Melanie (<a href="mailto:mel@mbacou.com" target="_blank">mel@mbacou.com</a>) wrote:</p> <blockquote type="cite"><span><div bgcolor="#FFFFFF" text="#000000"><div></div><div>
<div>
<p style="margin:1.2em 0px!important">Everyone,</p>
<p style="margin:1.2em 0px!important">The <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:nowrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">
varA...varZ</code> construct is borrowed from STATA syntax.
Probably a reason why it got into subset() in the first place,
though definitely not very R-like. In fact I’ve never come across
this construct in R before and had no idea it was actually working
either!</p>
<p style="margin:1.2em 0px!important">I’m not sure <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:nowrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">
dt[, .SD, .SDcols=list(varA...varZ)]</code> is less typing, less
prone to error, or more readable than <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:nowrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">
dt[, .SD, .SDcols=names(dt)[1:24]</code> and using indices is also
more flexible (what about if we want more complex sequences). I can
see one use case for this syntax though if <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:nowrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline">
dt</code> might change over time but variables always come in known
sequences.</p>
<p style="margin:1.2em 0px!important">Not sure we should really
encourage it — but agreed with Arun, if it’s in base::subset() then
no reason why not.</p>
<p style="margin:1.2em 0px!important">—Mel.</p>
<p style="margin:1.2em 0px!important">On 2/10/2015 1:50 PM,
Arunkumar Srinivasan wrote:</p>
<blockquote style="margin:1.2em 0px;border-left:4px solid rgb(221,221,221);padding:0px 1em;color:rgb(119,119,119);quotes:none">
<p style="margin:1.2em 0px!important">I had the same reaction
when I found out ‘subset’ already did this :-).</p>
<h2 style="margin:1.3em 0px 1em;padding:0px;font-weight:bold;font-size:1.4em;border-bottom:1px solid rgb(204,204,204)">
I’ve the same impression that it’s a bit odd, even though some
people prefer it..</h2>
<p style="margin:1.2em 0px!important">Arun</p>
<p style="margin:1.2em 0px!important">On 10 Feb 2015 at
19:39:29, Chris Neff (<a href="mailto:caneff@gmail.com" target="_blank">caneff@gmail.com</a>) wrote:</p>
<blockquote style="margin:1.2em 0px;border-left:4px solid rgb(221,221,221);padding:0px 1em;color:rgb(119,119,119);quotes:none">
<p style="margin:1.2em 0px!important">Wow, didn’t realize that
worked! So there is precedent then. It just looks funny to me, but
you are right it is easily avoided. I just didn’t want to see more
divergence from subset and data.frame logic, but since this already
works with subset that’s fine.<br>
On Tue Feb 10 2015 at 1:34:03 PM Arunkumar Srinivasan <a href="http://mailto:aragorn168b@gmail.com" target="_blank">aragorn168b@gmail.com</a>
wrote:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;overflow:auto;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:nowrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre-wrap;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block;padding:0.5em;color:rgb(51,51,51);background:none repeat scroll 0% 0% rgb(248,248,255)">Chris,
But what’s the problem? You can simply not use it?
It’s not that uncommon. `base::subset()` does this.
--
Arun
On 10 Feb 2015 at 19:31:43, Chris Neff (<a href="mailto:caneff@gmail.com" target="_blank">caneff@gmail.com</a>) wrote:
</code>
</pre>
<blockquote style="margin:1.2em 0px;border-left:4px solid rgb(221,221,221);padding:0px 1em;color:rgb(119,119,119);quotes:none">
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;overflow:auto;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:nowrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre-wrap;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block;padding:0.5em;color:rgb(51,51,51);background:none repeat scroll 0% 0% rgb(248,248,255)">I don't like this idea. It adds extra that it doesn't need to. Doing it with column numbers is more straightforward, and if all you have is names you can get numbers by doing match() or whatever and then getting the sequence with seq(). Having a sequence of column names is odd.
On Tue Feb 10 2015 at 1:28:25 PM Arunkumar Srinivasan <a href="mailto:aragorn168b@gmail.com" target="_blank"><aragorn168b@gmail.com></a> wrote:
Farrel,
It could be useful. Please file an issue on the github project page. Thanks.
--
Arun
On 10 Feb 2015 at 01:08:46, Farrel Buchinsky (<a href="mailto:fjbuch@gmail.com" target="_blank">fjbuch@gmail.com</a>) wrote:
</code>
</pre>
<blockquote style="margin:1.2em 0px;border-left:4px solid rgb(221,221,221);padding:0px 1em;color:rgb(119,119,119);quotes:none">
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;overflow:auto;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:nowrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre-wrap;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block;padding:0.5em;color:rgb(51,51,51);background:none repeat scroll 0% 0% rgb(248,248,255)"> So lets say one has a data.table with the following columns
<a href="http://first.name" target="_blank">first.name</a>, <a href="http://last.name" target="_blank">last.name</a>, height, weight, shoe.size, eye.color, hair.length, appendage.size, ear.length
If one wanted to just include weight through hair.length one would have to go something such as this
dt[,list(weight, shoe.size, eye.color, hair.length)]
Is there a way to do something along the lines of
dt[,list(weight...hair.length)]
If so, can you direct me to the documentation? If not can you build it? Is it difficult? Some data.tables have many columns.
Thanking you in anticipation.
Farrel
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ZS1oZWxwPGJyPg==" style="min-height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0">
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--<br>
Melanie BACOU<br>
International Food Policy Research Institute<br>
Snr. Program Manager, HarvestChoice<br>
Work <a href="tel:%2B1%28202%29862-5699" value="+12028625699" target="_blank">+1(202)862-5699</a><br>
E-mail <a href="mailto:m.bacou@cgiar.org" target="_blank">m.bacou@cgiar.org</a><br>
Visit <a href="http://www.harvestchoice.org" target="_blank">www.harvestchoice.org</a><br>
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