xtabs
creates a contingency table (optionally a sparse matrix) from
cross-classifying factors, usually contained in a data-frame-like object,
using a formula interface. NOTE: This man page is for the xtabs
S4 generic function
defined in the BiocGenerics package.
See ?stats::xtabs
for the default method
(defined in the stats package).
Bioconductor packages can define specific methods for objects
not supported by the default method.
xtabs(formula=~., data=parent.frame(), subset, sparse=FALSE, na.action, exclude=c(NA, NaN), drop.unused.levels=FALSE)
?stats::xtabs
for a description of
these arguments.
?stats::xtabs
for the value returned by the
default method.Specific methods defined in Bioconductor packages should also
return the type of object returned by the default method.
stats::xtabs
for the default xtabs
method.
showMethods
for displaying a summary of the
methods defined for a given generic function.
selectMethod
for getting the definition of
a specific method.
xtabs
method (defined
for DataTable objects).
xtabs # note the dispatch on the 'data' arg only showMethods("xtabs") selectMethod("xtabs", "ANY") # the default method