From: bogdan romocea <br44114_at_gmail.com>

Date: Sat 23 Apr 2005 - 03:26:33 EST

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Apr 23 03:31:14 2005

Date: Sat 23 Apr 2005 - 03:26:33 EST

Great suggestion; it made me change all my Ts/Fs to TRUE/FALSE.
Given

F <- TRUE

T <- FALSE

is it possible to forbid T to stand for TRUE, and F for FALSE in

function(...,something=T)?

Or, alternatively, never allow F <- whatever and T <- whatever?

I don't know what the technical side is, but I think it would be much better if this particular blunder (major, yet rather easy to overlook) was impossible to make.

>>>>> "Andy" == Andy Bunn <abunn@whrc.org>

>>>>> on Tue, 19 Apr 2005 10:27:04 -0400 writes:

.....

Andy> is.tuesday <- as.POSIXlt(Sys.time())$wday == 2
Andy> if (is.tuesday == T) { ....}

.....

aaah, this really hurts my eyes or rather the brain behind! And it's by far not the first such instance...

Rather use " if (is.tuesday) { .... } "

More generally, please, please, everyone :

Replace

if (something == TRUE) with if (something) and if (something.or.other == FALSE) with if (!something.or.other)

{and even more for cases where you have
'T' and 'F' instead of 'TRUE' and 'FALSE' -
which is against all recommendations, since
F <- TRUE

T <- FALSE

are valid statements, probably not common, but think what
happens when you accidentally have the equivalent of "T <- 0"
somewhere in your global enviroment!

}

Martin Maechler, ETH Zurich

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Apr 23 03:31:14 2005

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