which: Which values in an object are considered TRUE?
In BiocGenerics: S4 generic functions used in Bioconductor

Description Usage Arguments Value See Also Examples

Give the indices of the values in a vector-, array-, or list-like object that are considered TRUE, allowing for array indices in the case of an array-like object.

NOTE: This man page is for the which S4 generic function defined in the BiocGenerics package. See ?base::which for the default method (defined in the base package). Bioconductor packages can define specific methods for objects (typically vector-, array-, or list-like) not supported by the default methods.

1	which(x, arr.ind=FALSE, useNames=TRUE)

`x`	An object, typically with a vector-, array-, or list-like semantic.
`arr.ind, useNames`	See `?base::which` for a description of these arguments.

See ?base::which for the value returned by the default method.

Specific methods defined in Bioconductor packages should behave as consistently as possible with the default method.

base::which for the default which method.
showMethods for displaying a summary of the methods defined for a given generic function.
selectMethod for getting the definition of a specific method.
which,DelayedArray-method in the DelayedArray package for an example of a specific which method (defined for DelayedArray objects).
BiocGenerics for a summary of all the generics defined in the BiocGenerics package.

which
showMethods("which")
selectMethod("which", "ANY")  # the default method

library(DelayedArray)
showMethods("which")
## The which() method for DelayedArray objects:
selectMethod("which", "DelayedArray")