From jpnolan at american.edu  Thu Dec  8 21:37:02 2016
From: jpnolan at american.edu (John P. Nolan)
Date: Thu, 8 Dec 2016 20:37:02 +0000
Subject: [Rd] require(..., quietly=TRUE) does not suppress warning
In-Reply-To: <1804590771.4159744.1481226182222.JavaMail.zimbra@fredhutch.org>
References: <1804590771.4159744.1481226182222.JavaMail.zimbra@fredhutch.org>
Message-ID: <DM2PR0601MB8114F4AC698C3C0F291AA68C6840@DM2PR0601MB811.namprd06.prod.outlook.com>

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
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John P. Nolan
Math/Stat Dept., American University
Gray Hall, 4400 Massachusetts Ave, NW
Washington, DC 20016-8050
Phone: 202-885-3140
E-mail:  jpnolan at american.edu
Web:   http://fs2.american.edu/jpnolan/www/



-----Original Message----
From: R-devel [mailto:r-devel-bounces at r-project.org] On Behalf Of Dan Tenenbaum
Sent: Thursday, December 8, 2016 2:43 PM
To: R-devel <r-devel at 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

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[Rd] require(..., quietly=TRUE) does not suppress warning
John P. Nolan