[Rd] New package Oarray

Jonathan Rougier J.C.Rougier@durham.ac.uk
Fri, 18 May 2001 09:58:43 +0100 (BST)

Hi Everyone,

I recently uploaded the package Oarray to CRAN.  After a suggestion from
Martin M., I should just clarify that this is a generalisation of zmatrix
in the following respects:

1) Can handle arbitrary numbers of extents;

2) Can have arbitrary non-negative offsets (not just zero) that vary
across the extents;

3) Can be switched also to have negative offsets, in which case negative
subscripts *do not* drop components.

Oarray operates quite differently from zmatrix, depending upon the way
that match.call() parses the calls to "[.Oarray" and "[<-.Oarray" (I hope
that this is stable!).

I often use R as a general-purpose computing environment and I have
encountered several situations in which arrays with offsets that are not
zero or one are useful, hence the generalisation of zmatrix.  I would be
interested if anyone can suggest any applications in statistics, though!

Cheers, Jonathan.

Jonathan Rougier                       Science Laboratories
Department of Mathematical Sciences    South Road
University of Durham                   Durham DH1 3LE
tel: +44 (0)191 374 2361, fax: +44 (0)191 374 7388

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