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This function converts an xtabs object to a matrix.
# S3 method for xtabs
as.matrix(x, ...)
an object of class xtabs
additional arguments to be passed to or from methods.
Andri Signorell <andri@signorell.net>
An xtabs object is indeed already a matrix, but won't be converted to a pure matrix by as.matrix.default function, as its class definition will remain unchanged. Some functions expecting a pure matrix may fail, when fed with a xtabs object.
as.matrix.xtabs will drop the classes and the call attribute.
Note that unclass would as well discard the classes xtabs and table, but retain the "call" attribute.
tab <- xtabs( ~ driver + operator, data=d.pizza)
str(tab)
class(tab)
str(as.matrix(tab))
class(as.matrix(tab))
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