[R] stringification magic in subset?
ivo welch
ivowel at gmail.com
Wed May 2 17:13:14 CEST 2007
dear R wizards:
I am trying to replace subset() with my own version that first checks
that each name in the select statement has a corresponding name in the
data set. preferably, it would have the same syntax and semantics as
subset() otherwise.
alas, subset works in interesting ways:
subset(d, select=col1)
works just like
subset(d, select="col1")
somehow, subset manages to "stringify" its argument in such cases. Is
it possible to duplicate the subset method one-for-one?
a minor question---where do I find the source definition such as that
of subset(), which is defined in
> subset
function (x, ...)
UseMethod("subset")
<environment: namespace:base>
>
any help, as usual, appreciated.
regards,
/ivo
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