[R] cannot use package RcmdrPlugin.plotByGroup

Fox, John jfox at mcmaster.ca
Sun Jul 23 00:21:35 CEST 2017

Dear Lu Wei,

I'm the author of the Rcmdr package but not of RcmdrPlugin.plotByGroup, so if there really is a problem -- which isn't apparent from your message -- then you may wish to contact the package author.

First, as a general matter, menu items in the Rcmdr are grayed out if they're inappropriate in the current context. Rcmdr plug-in authors can use the same mechanism. So, for example, most menu items are grayed out before you read a data set, and menu items that require a categorical variable will be grayed out if there are no factors (or character variables or logical variables) in the active data set.

Second, Rcmdr plug-in packages aren't loaded by the library("Rcmdr") command. You can load a plug-in from the Rcmdr Tools menu; and many (but not all) Rcmdr plug-in packages can be loaded directly via the library() command, in which case the Rcmdr package is also loaded. I don't know whether library("RcmdrPlugin.plotByGroup") will work, but you can try it.

I hope this helps,

John Fox, Professor Emeritus
McMaster University
Hamilton, Ontario, Canada
Web: socserv.mcmaster.ca/jfox

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Lu Wei
> Sent: Saturday, July 22, 2017 12:49 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] cannot use package RcmdrPlugin.plotByGroup
> Greetings,
> I am a new use of R, starting from R-commander.
> I find that the default quantile-comparison (Q-Q plot) of R-commander
> has no group option, and I happened to notice RcmdrPlugin.plotByGroup in
> the packages list. As the name is so explicit, I installed it, loaded
> it, R-commander restarted, but the 3 menu item under Graphs->plot by
> group are all greyed out. What could be wrong?
> --
> Regards,
> Lu Wei
> PGP key ID: 0x A12F EF75 92CC E1EA
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