select not working?

[Imanuel Costigan]

I run the following

> library("dplyr")
> iris <- tbl_df(iris)
> iris %>% select(Sepal.Length)

I get

Error in select(., Sepal.Length) : unused argument (Sepal.Length)

Is this a change in dplyr behaviour? This seems inconsistent with my experience so far.

> session_info()
Session info -----------------------------------------------------------------------------------
 setting  value                      
 version  R version 3.2.0 (2015-04-16)
 system   x86_64, mingw32            
 ui       RStudio (0.99.442)          
 language (EN)                        
 collate  English_Australia.1252      
 tz       Australia/Sydney            


Packages ---------------------------------------------------------------------------------------
 package    * version date       source        
 assertthat   0.1     2013-12-06 CRAN (R 3.2.0)
 curl         0.8     2015-06-06 CRAN (R 3.2.0)
 DBI        * 0.3.1   2014-09-24 CRAN (R 3.2.0)
 devtools   * 1.8.0   2015-05-09 CRAN (R 3.2.0)
 digest       0.6.8   2014-12-31 CRAN (R 3.2.0)
 dplyr      * 0.4.2   2015-06-16 CRAN (R 3.2.0)
 git2r        0.10.1  2015-05-07 CRAN (R 3.2.0)
 lazyeval     0.1.10  2015-01-02 CRAN (R 3.2.0)
 lubridate  * 1.3.3   2013-12-31 CRAN (R 3.2.0)
 magrittr     1.5     2014-11-22 CRAN (R 3.2.0)
 MASS       * 7.3-40  2015-03-21 CRAN (R 3.2.0)
 memoise      0.2.1   2014-04-22 CRAN (R 3.2.0)
 plyr         1.8.3   2015-06-12 CRAN (R 3.2.0)
 R6           2.0.1   2014-10-29 CRAN (R 3.2.0)
 Rcpp         0.11.6  2015-05-01 CRAN (R 3.2.0)
 readr      * 0.1.1   2015-05-29 CRAN (R 3.2.0)
 readxl     * 0.1.0   2015-04-14 CRAN (R 3.2.0)
 reshape2     1.4.1   2014-12-06 CRAN (R 3.2.0)
 rversions    1.0.1   2015-06-06 CRAN (R 3.2.0)
 stringi      0.4-1   2014-12-14 CRAN (R 3.2.0)
 stringr    * 1.0.0   2015-04-30 CRAN (R 3.2.0)
 tidyr      * 0.2.0   2014-12-05 CRAN (R 3.2.0)
 xml2         0.1.1   2015-06-02 CRAN (R 3.2.0)

[Imanuel Costigan]

Also:

> iris %>% select_("Sepal.Length")
Source: local data frame [150 x 1]


   Sepal.Length
1           5.1
2           4.9
3           4.7
4           4.6
5           5.0
6           5.4
7           4.6
8           5.0
9           4.4
10          4.9
..          ...

[Hadley Wickham]

Works for me. Are you sure you haven't accidentally overridden select?
Hadley

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[Imanuel Costigan]

Must have been corrupted library. Deleted everything and started again and now it works. Hurray!

[Imanuel Costigan]

Nope wasn't that. I was loading MASS after dplyr. That meant dplyr's select was being masked. Lesson: almost always load dplyr last.

[mkrasmus]

Removing MASS after loading dplyr also causes the same problem. Yes sirree.

[David Winsemius]

> On Jul 10, 2017, at 8:47 PM, mkrasmus <mkra...@gmail.com> wrote:
>
> Removing MASS after loading dplyr also causes the same problem. Yes sirree.
>
> On Wednesday, 17 June 2015 08:46:44 UTC+10, Imanuel Costigan wrote:
> Nope wasn't that. I was loading MASS after dplyr. That meant dplyr's select was being masked. Lesson: almost always load dplyr last.

I suppose that's one possible moral. The other moral might be: Read the package messages:

> library(dplyr)
> library(MASS)

Attaching package: ‘MASS’

The following object is masked from ‘package:dplyr’:

select


>

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David Winsemius
Alameda, CA, USA