| nullify {vetr} | R Documentation |
Set Element to NULL Without Removing It
Description
This function is required because there is no straightforward way to over-write a value in a list with NULL without completely removing the entry from the list as well.
Usage
nullify(obj, index)
## Default S3 method:
nullify(obj, index)
Arguments
obj |
the R object to NULL a value in |
index |
an indexing vectors of values to NULL |
Details
This returns a copy of the object modified with null slots; it does not modify the input argument.
Default method will attempt to convert non-list objects to lists
with as.list, and then back to whatever they were by using a
function with name paste0("as.", class(obj)[[1L]])
if it exists and works. If the object cannot be coerced back
to its original type the corresponding list will be returned.
If this is not appropriate for your object type you can write an S3 method for it.
Value
object with selected values NULLified
Note
attributes are copied from original object and re-applied to final object before return, which may not make sense in some circumstances.
Examples
nullify(list(1, 2, 3), 2)
nullify(call("fun", 1, 2, 3), 2)