[R] zero-offset matrices

Jonathan Rougier J.C.Rougier at durham.ac.uk
Tue Mar 2 13:18:46 CET 1999

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"

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)

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