On 1/26/2009 1:46 PM, Alexy Khrabrov wrote:
Every time I have to prefix a dataframe column inside the indexing
brackets with the dataframe name, e.g.
df[df$colname==value,]
-- I am wondering, why isn't there an R scoping rule that search
starts with the dataframe names, as if we'd said
with(df, df[colname==value,])
-- wouldn't that be a reasonable default to prepend to the name search
path?
If you did that, it would be quite difficult to get at a "colname"
variable that *isn't* the column of df. It would be something like
df[get("colname", parent.frame()) == value,]
So just use subset(), or with(), or type the extra 3 chars.
Duncan
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