Operators acting on data structures to extract parts.
# S4 method for Resamples,ANY,ANY,ANY
[(x, i, j, drop = FALSE)# S3 method for SurvMatrix
[(x, i, j, drop = FALSE)
object from which to extract elements.
indices specifying elements to extract.
logical indicating that the result be returned as a
numeric
coerced to the lowest dimension possible if TRUE
or
retained as the original 2-dimensional object class otherwise.