This function converts an
xtabs object to a
## S3 method for class 'xtabs' as.matrix(x, ...)
an object of class
additional arguments to be passed to or from methods.
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
as.matrix.xtabs will drop the classes and the call attribute.
unclass would as well discard the classes
table, but retain the
Andri Signorell <email@example.com>
tab <- xtabs( ~ driver + operator, data=d.pizza) str(tab) class(tab) str(as.matrix(tab)) class(as.matrix(tab))
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