Extract.grouped.data {actuar} | R Documentation |
Extract or Replace Parts of a Grouped Data Object
Description
Extract or replace subsets of grouped data objects.
Usage
## S3 method for class 'grouped.data'
x[i, j]
## S3 replacement method for class 'grouped.data'
x[i, j] <- value
Arguments
x |
an object of class |
i , j |
elements to extract or replace. |
value |
a suitable replacement value. |
Details
Objects of class "grouped.data"
can mostly be indexed like data
frames, with the following restrictions:
For
[
, the extracted object must keep a group boundaries column and at least one group frequencies column to remain of class"grouped.data"
;For
[<-
, it is not possible to replace group boundaries and group frequencies simultaneously;When replacing group boundaries,
length(value) == length(i) + 1
.
x[, 1]
will return the plain vector of group boundaries.
Replacement of non adjacent group boundaries is not possible for obvious reasons.
Otherwise, extraction and replacement should work just like for data frames.
Value
For [
an object of class "grouped.data"
, a data frame or a
vector.
For [<-
an object of class "grouped.data"
.
Note
Currently [[
, [[<-
, $
and $<-
are not
specifically supported, but should work as usual on group frequency
columns.
Author(s)
Vincent Goulet vincent.goulet@act.ulaval.ca
See Also
[.data.frame
for extraction and replacement
methods of data frames, grouped.data
to create grouped
data objects.
Examples
data(gdental)
(x <- gdental[1]) # select column 1
class(x) # no longer a grouped.data object
class(gdental[2]) # same
gdental[, 1] # group boundaries
gdental[, 2] # group frequencies
gdental[1:4,] # a subset
gdental[c(1, 3, 5),] # avoid this
gdental[1:2, 1] <- c(0, 30, 60) # modified boundaries
gdental[, 2] <- 10 # modified frequencies
## Not run: gdental[1, ] <- 2 # not allowed