[R] Question about a passage in R language

Sébastien Durier sdurier.stat at gmail.com
Fri Dec 11 22:09:50 CET 2015


In ?Extract, one can read "An empty index selects all values: this is 
most often used to replace all the entries but keep the attributes"
No example is given but if x a vector I interpret this sentence as 
"x[]". And in fact, all attributes seem to be preserved by this indexing.
But in the R language manual 
the following passage puzzles me : "Empty. The expression x[] returns x, 
but drops “irrelevant” attributes from the result." I must misunderstand 
something because it sounds contradictory with the help page.

Thank you


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