[R] zero-offset matrices

[Jonathan Rougier]

Has anyone written subscripting methods for matrices which are indexed
from zero? i.e. functions such as "[.zoffset" and "[<-.zoffset" which
would allow, given an appropriate function "zmatrix"

"zmatrix" <- function(...)
{
	robj <- matrix(...)
	class(robj) <- "zoffset"
	robj
}

fred <- zmatrix(1:20, 4, 5)
fred[0, 4]		# would be 17
fred[3, ] <- NA		# would set the last row to NA

Many thanks, Jonathan.

Jonathan Rougier                       Science Laboratories
Department of Mathematical Sciences    South Road
University of Durham                   Durham DH1 3LE

"[B]egin upon the precept ... that the things we see are to be 
 weighed in the scale with what we know"  (Meredith, 1879, The Egoist)

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._