From: Petr PIKAL <petr.pikal_at_precheza.cz>

Date: Thu, 10 Jun 2010 10:19:11 +0200

R-help_at_r-project.org mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu 10 Jun 2010 - 08:22:31 GMT

Date: Thu, 10 Jun 2010 10:19:11 +0200

Hi

Peter Ehlers <ehlers_at_ucalgary.ca> napsal dne 09.06.2010 19:05:24:

> Soapbox:

*> Well, if you're just starting out with R it would be
**> a VERY good idea to learn right away that T is not TRUE
**> and F is not FALSE, at least not always. Sooner or
**> later you WILL have problems. So do yourself a favour
**> and get into the habit of using TRUE/FALSE instead of T/F.
**>
**> (I know that Petr knows better.)
*

Yes good point. However when I work interactively with command prompt I often (well almost exclusively :-) use T/F instead of TRUE/FALSE as I am lazy to type. It is necessary to keep habit not to use T/F/c/matrix/vector/... as names for objects. So T can be used as abbreviation for TRUE like

mean(x, na.rm=T)

as long as you do not define

T <- "Title"

mean(x, na.rm=T)

Error in if (na.rm) x <- x[!is.na(x)] :
argument is not interpretable as logical

at least until T/F is removed from such use by R developers

and you can read help page for that.

*>
**> -Peter Ehlers
**>
*

> On 2010-06-09 9:08, Larissa Lucena wrote:

*> > Thanks so much!!! I'm using R for the first time, and so, I have many
*

stupid

> > doubts! Sorry and thanks again!

*> >
**> > Regards!
**> >
**> > 2010/6/9 Petr PIKAL<petr.pikal_at_precheza.cz>
**> >
**> >> Hi
**> >>
**> >> where did you find parameter add=T.
**> >>
**> >> You can use
**> >>
**> >> par(new=T)
**> >> before using new plot command
**> >>
**> >> or use
**> >>
**> >> points, lines
**> >>
**> >> Regards
**> >> Petr
**> >>
*

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