Update the elements of a list
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.
## S3 method for class 'list'
update(object,
new,
unnamed=FALSE,
...)object |
Object to be updated. |
new |
List or dataframe containing new elements. |
unnamed |
Logical. If |
... |
optional method arguments (ignored) |
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.
This method can be called directly, or as via the S3 base method for update.
Gregory R. Warnes greg@warnes.net
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
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