Extract.grouped.data: Extract or Replace Parts of a Grouped Data Object

Extract.grouped.dataR Documentation

Extract or Replace Parts of a Grouped Data Object


Extract or replace subsets of grouped data objects.


## S3 method for class 'grouped.data'
x[i, j]
## S3 replacement method for class 'grouped.data'
x[i, j] <- value



an object of class grouped.data.

i, j

elements to extract or replace. i, j are numeric or character or, for [ only, empty. Numeric values are coerced to integer as if by as.integer. For replacement by [, a logical matrix is allowed, but not replacement in the group boundaries and group frequencies simultaneously.


a suitable replacement value.


Objects of class "grouped.data" can mostly be indexed like data frames, with the following restrictions:

  1. For [, the extracted object must keep a group boundaries column and at least one group frequencies column to remain of class "grouped.data";

  2. For [<-, it is not possible to replace group boundaries and group frequencies simultaneously;

  3. 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.


For [ an object of class "grouped.data", a data frame or a vector.

For [<- an object of class "grouped.data".


Currently [[, [[<-, $ and $<- are not specifically supported, but should work as usual on group frequency columns.


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.



(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

actuar documentation built on Nov. 8, 2023, 9:06 a.m.