[datatable-help] CJ and setkey sort differently

[Malcolm Hawkes]

Arun

Oops, yes it should.  And vec1 <- c("Corp", "CORP")

Took me while to track down, what was causing but got it in the end ☺

Where / how do I file a bug report ?

Thanks

Malcolm

Malcolm Hawkes
On-Site Consultant, Investments - RiskManagement
Grosvenor Capital Management, L.P.
900 N. Michigan Avenue, Suite 1100
Chicago, IL  60611
mhawkes at gcmlp.com

From: Arunkumar Srinivasan [mailto:aragorn168b at gmail.com]
Sent: Friday, February 14, 2014 3:38 PM
To: datatable-help at lists.r-forge.r-project.org; Malcolm Hawkes
Subject: Re: [datatable-help] CJ and setkey sort differently

Malcolm,

Thanks for the nice report. I suppose your `dt` creation should be: `dt <- CJ(vec1, vec2)`. The reason is pretty clear. It's an easy fix. Could you please file a bug report? Thank you.

Arun
________________________________
From: Malcolm Hawkes Malcolm Hawkes<mailto:mhawkes at gcmlp.com>
Reply: Malcolm Hawkes mhawkes at gcmlp.com<mailto:mhawkes at gcmlp.com>
Date: February 14, 2014 at 10:34:21 PM
To: datatable-help at lists.r-forge.r-project.org<mailto:datatable-help at lists.r-forge.r-project.org> datatable-help at lists.r-forge.r-project.org<mailto:datatable-help at lists.r-forge.r-project.org>
Subject:  [datatable-help] CJ and setkey sort differently
Ran in to the warning

Warning in setkeyv(x, cols, verbose = verbose) :
  Already keyed by this key but had invalid row order, key rebuilt. If you didn't go under the hood please let datatable-help know so the root cause can be fixed.

You can reproduce it with
vec1 <- c("CMDTY", "Copper", "CORPOAS")
vec2 <-  1:3
dt <- CJ(vec1, Date)
setkey(dt, V1, V2)

Issue seems to be that CJ (..., sorted = TRUE) and setkey want to sort the character data in different orders, one case-sensitive, one not.

CJ creates

     V1 V2
1: Corp  1
2: Corp  2
3: Corp  3
4: CORP  1
5: CORP  2
6: CORP  3

And it’s keyed as you would expect by V1 then V2
> key(dt)
[1] "V1" "V2"


But after doing setkey you have

     V1 V2
1: CORP  1
2: CORP  2
3: CORP  3
4: Corp  1
5: Corp  2
6: Corp  3



data.table version 1.8.10

> R.version
               _
platform       x86_64-w64-mingw32
arch           x86_64
os             mingw32
system         x86_64, mingw32
status
major          3
minor          0.2
year           2013
month          09
day            25
svn rev        63987
language       R
version.string R version 3.0.2 (2013-09-25)
nickname       Frisbee Sailing
>


Malcolm Hawkes
On-Site Consultant, Investments - RiskManagement
Grosvenor Capital Management, L.P.
900 N. Michigan Avenue, Suite 1100
Chicago, IL  60611
mhawkes at gcmlp.com<mailto:mhawkes at gcmlp.com>



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