Keep the 'label' attribute on an R object when subsetting. loosen.labels allows the 'label'
attribute to be lost again.
keep.labels(x, ...)
# S3 method for class 'data.frame'
keep.labels(x, ...)
# Default S3 method
keep.labels(x, ...)
# S3 method for class 'keep_labels'
x[...]
# S3 method for class 'keep_labels'
x[i] <- value
loosen.labels(x, ...)
# S3 method for class 'data.frame'
loosen.labels(x, ...)
# Default S3 method
loosen.labels(x, ...)A copy of x with a "keep_labels" class appended on or removed. Note that for the data.frame method,
only classes on the columns are changed; the data.frame won't have an extra class appended. This is different from previous
versions of arsenal.