xtabs
Cross tabulation
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.
- Keywords
- methods
Usage
xtabs(formula=~., data=parent.frame(), subset, sparse=FALSE, na.action, exclude=c(NA, NaN), drop.unused.levels=FALSE)Arguments
- formula, subset, sparse, na.action, exclude, drop.unused.levels
-
See
?stats::xtabsfor a description of these arguments. - data
- A data-frame-like object.
Value
-
See
?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.
See Also
-
stats::xtabsfor the defaultxtabsmethod. -
showMethodsfor displaying a summary of the methods defined for a given generic function. -
selectMethodfor getting the definition of a specific method. - xtabs,DataTable-method in the S4Vectors
package for an example of a specific
xtabsmethod (defined for DataTable objects). - BiocGenerics for a summary of all the generics defined in the BiocGenerics package.
Examples
xtabs # note the dispatch on the 'data' arg only
showMethods("xtabs")
selectMethod("xtabs", "ANY") # the default method
Community examples
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