http://stackoverflow.com/questions/6065724/assigning-value-to-a-variable-that-has-a-dot-in-the-name
made me realize this.
The context is 'a' is assigned to ret$log.id, but then ret$log returns "a" and
ret$l also returns "a".
There is a comment from Charles on the question:
"Also see options(warnPartialMatchDollar=T) if you want to track these."
But, in bottom part, there is Chase's answer, quoting help page for $.
... under Character indices:
Thus the default behaviour is to use partial matching only when extracting from
recursive objects (except environments) by $. Even in that case, warnings can
be switched on by options(warnPartialMatchAttr = TRUE).
This is what I get from R documentation of 'options'.
‘warnPartialMatchAttr’: logical. If true, warns if partial
matching is used in extracting attributes via ‘attr’.
‘warnPartialMatchDollar’: logical. If true, warns if partial
matching is used for extraction by ‘$’.
So, in the part of help page on '$' quoted in part of Chase's answer above,
options(warnPartialMatchAttr = TRUE)
should be
options(warnPartialMatchDollar = TRUE)
This is in R 2.15.2.
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