[R] programming questions
ivowel at gmail.com
Wed Nov 3 19:05:45 CET 2010
quick programming questions. I want to "turn on" more errors. there
are two traps I occasionally fall into.
* I wonder why R thinks that a variable is always defined in a data frame.
> d= data.frame( x=1:5, y=1:5 )
this is a bit unfortunate for me, because subsequent errors become
less clear. right now, I need to do '(is.defined(d) and
!is.null(d$z))' to check that my function inputs are valid. It would
be nicer if one could just write "if (is.defined(d$z)".
* is there a way to turn off automatic recycling? I would rather get
an error than unexpected recycling. I can force recycling with rep()
when I need to.
Ivo Welch (ivo.welch at brown.edu, ivo.welch at gmail.com)
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