Well, it says "most often" no errors/warnings are given, so it is not
contradicting the docs! It looks like the person/team that coded require( )
decided you should get an error when the package doesn't exist.
If you want a silent loading, consider
aaa <- try( library(foo,verbose=FALSE,quietly=TRUE),silent=TRUE)
and then check to see if aaa is of class "try-error" and check for failure
John
………………………………………………………………………………..
John P. Nolan
Math/Stat Dept., American University
Gray Hall, 4400 Massachusetts Ave, NW
Washington, DC 20016-8050
Phone: 202-885-3140
E-mail: jpno...@american.edu
Web: http://fs2.american.edu/jpnolan/www/
-----Original Message----
From: R-devel [mailto:r-devel-boun...@r-project.org] On Behalf Of Dan Tenenbaum
Sent: Thursday, December 8, 2016 2:43 PM
To: R-devel <r-devel@r-project.org>
Subject: [Rd] require(..., quietly=TRUE) does not suppress warning
Hi,
The `quietly` argument of `require` is documented as follows:
quietly: a logical. If ‘TRUE’, no message confirming package
attaching is printed, and most often, no errors/warnings are
printed if package attaching fails.
However:
> require(foo, quietly=TRUE)
Warning message:
In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return =
TRUE, :
there is no package called ‘foo’
Am I misreading the docs or is R misbehaving?
> sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-apple-darwin13.4.0 (64-bit) Running under: macOS Sierra 10.12.1
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Dan
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
