ivo welch wrote:
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.
> is.defined(d)
[1] FALSE
> d= data.frame( x=1:5, y=1:5 )
> is.defined(d$z)
[1] TRUE
> is.defined(nonexisting$garbage)
[1] TRUE
Which package/version of R is the 'is.defined' function in?
I don't seem to have it here on 2.11.1, which I know is not
the latest version of R.
What does 'defined' mean?
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)".
"z" %in% names(d) ?
* 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.
regards,
/iaw
----
Ivo Welch (ivo.we...@brown.edu, ivo.we...@gmail.com)
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