Update the elements of a list

Description

Function to update the elements of a list to contain all of the named elements of a new list, overwriting elements with the same name, and (optionally) copying unnamed elements.

Usage

## S3 method for class 'list'
update(object,
       new,
       unnamed=FALSE,
       ...)

Arguments

Value

A new list constructed from the elements of object by merging the elements of old and new with named items of new replacing the corresponding elements of old. Unnamed elements of new will be appened unless unnamed=FALSE.

Note

This method can be called directly, or as via the S3 base method for update.

Author(s)

Gregory R. Warnes greg@warnes.net

See Also

update, merge

Examples

old <- list(a=1,b="red",c=1.37)
new <- list(b="green",c=2.4)

update(old, new)
update.list(old,new)  # equivalent

older <- list(a=0, b="orange", 4, 5, 6)
newer <- list(b="purple", 7, 8, 9)
update(older, newer)               # ignores unnamed elements of newer
update(older, newer, unnamed=TRUE) # appends unnamed elements of newer