[R-pkg-devel] Warning: S4 exports specified in 'NAMESPACE' but not defined in package

Max Turgeon M@x@Turgeon @end|ng |rom um@n|tob@@c@
Mon Jun 1 18:52:41 CEST 2020

Good morning,

I had a quick look at the source file on CRAN, and I don't see any evidence that you're using S4 classes...? Indeed, at the end of your function 'bujar', you are defining the class of the results using "class(x) <- value", which is an S3 idiom.

If indeed you're using S3 instead of S4, then the correct section of WRE is 1.5.2, and therefore you'll need to clean up your NAMESPACE.


Max Turgeon
Assistant Professor
Department of Statistics
Department of Computer Science
University of Manitoba

From: R-package-devel <r-package-devel-bounces using r-project.org> on behalf of Wang, Zhu <wangz1 using uthscsa.edu>
Sent: June 1, 2020 11:34:27 AM
To: R-package-devel using r-project.org
Subject: [R-pkg-devel] Warning: S4 exports specified in 'NAMESPACE' but not defined in package

Caution: This message was sent from outside the University of Manitoba.

Dear All,

I received warnings regarding a package:


The warning still occurred after I changed export(bujar, gcv.enet) to export(bujar) in NAMESPACE. The function bujar was defined in the package, so I probably missed something in Sec 1.5.6 in Writing R Extensions.

Could somebody kindly advise how to address the warning?


Zhu Wang

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