Full_Name: Philip Kensche
Version: 2.3.0
OS: Redhat Linux
Submission from: (NULL) (131.174.88.204)
Try this:
--
x <- data.frame(the.first.column=c("A"), the.second.column=c("b"),
the.third.column=c("d"), and.many.more.columns=c("e"))
by(x, paste(x$the.first.column, x$the.second.column, x$and.many.more.columns,
sep="."), function (y) { print("Hello!") })
--
The following error message is produced on my system:
Error in "names<-.default"(`*tmp*`, value = c("paste(x$the.first.column,
x$the.second.column, x$and.many.more.columns, ", :
'names' attribute [2] must be the same length as the vector [1]
Calling substitute(INDICES) after debug(by.data.frame) returns:
--
paste(x$the.first.column, x$the.second.column, x$and.many.more.columns,
sep = ".")
--
i.e. the sep = ... is on the next line.
Greetings,
Philip
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