Keep Labels
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 replacement 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, ...)
x | 
 An R object  | 
... | 
 Other arguments (not in use at this time).  | 
i, value | 
 See   | 
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.
Ethan Heinzen
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