[R] duplicated function

Dennis Fisher fisher at plessthan.com
Tue Nov 18 16:23:41 CET 2014

R 3.1.1


When I use the duplicated function, I often need to find both the duplicates and the original element that was duplicated.  This can be accomplished with:
	duplicated(OBJECT) | duplicated(OBJECT, fromLast=TRUE)

>From my perspective, an improvement in the duplicated function would be an option that accomplishes this with a single call to the function.  This could either be:
	1.  a new option: all=TRUE (pick whatever name makes sense)
	2.  allowing fromLast to take a new value (e.g., NA, in the spirit of the xpd option in par())

If my suggestion would yield unintended consequences, it can certainly be ignored.


Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-866-PLessThan (1-866-753-7784)

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