On 10.06.2010 11:15, Petr PIKAL wrote:
Hi
Uwe Ligges<lig...@statistik.tu-dortmund.de> napsal dne 10.06.2010
10:37:05:
On 10.06.2010 10:19, Petr PIKAL wrote:
Hi
Peter Ehlers<ehl...@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
But note that
T<- 0
mean(x, na.rm=T)
will yield a more surprising result and that's the reason why you really
should not even start to use F and T (neither for a logical value nor
for a number).
Uwe Ligges
I believe that if you consider T/F as reserved word and do not assign
number or text to it you can be on safe side.
I agree that in programs it is far better to use TRUE/FALSE instead T/F as
you never know if user does not define his own T/F (but he can define its
own mean function with unexpected result too).
There was some thread about T/F and TRUE/FALSE about half a year ago with
no definite output, so I consider it probably still quite controversial
item.
At least not controversial for me. ;-)
Uwe
Regards
Petr
at least until T/F is removed from such use by R developers
You can even try
?"T"
and you can read help page for that.
Regards
Petr
-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.pi...@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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