[Rcpp-devel] Subsetting / slicing with Vectors

[Kevin Ushey]

Hi guys,

I'm wondering -- what operations are available for subsetting of Vectors in
Rcpp? I've scoured through all the vignettes but it seems like a couple
'nice-to-haves' aren't there yet. My questions:

* is there a difference between subsetting a vector with () vs []?

* is it possible to subset based on a collection of indices, eg:

NumericVector X(10);
NumericVector Y = X[ c(1, 2, 5) ]

* is it possible to slice a vector, eg. such that we either hold a
reference to, or copy out, the elements at every 'x' indices? I know 'seq'
is available for consecutive indices, but might there be a third 'by'
argument coming, or an alternative function, soon?

Thanks for the help,
-Kevin
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