The number of rows/columns of an array-like object
Return the number of rows or columns present in an array-like object.
NOTE: This man page is for the nrow, ncol, NROW and
NCOL S4 generic functions defined in the BiocGenerics
package.
See ?base::nrow for the default methods (defined in
the base package).
Bioconductor packages can define specific methods for objects
(typically matrix- or array-like) not supported by the default methods.
nrow(x) ncol(x) NROW(x) NCOL(x)
x |
A matrix- or array-like object. |
A single integer or NULL.
Specific methods defined in Bioconductor packages should behave as consistently as possible with the default methods.
base::nrow for the default nrow,
ncol, NROW and NCOL methods.
showMethods for displaying a summary of the
methods defined for a given generic function.
selectMethod for getting the definition of
a specific method.
nrow,DataFrame-method in the S4Vectors
package for an example of a specific nrow method (defined
for DataFrame objects).
BiocGenerics for a summary of all the generics defined in the BiocGenerics package.
nrow
showMethods("nrow")
selectMethod("nrow", "ANY") # the default method
ncol
showMethods("ncol")
selectMethod("ncol", "ANY") # the default method
NROW
showMethods("NROW")
selectMethod("NROW", "ANY") # the default method
NCOL
showMethods("NCOL")
selectMethod("NCOL", "ANY") # the default methodPlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.