Extract those lines of a parameter frame with unique elements in the value column
# S3 method for parframe
unique(x, incomparables = FALSE, tol = 1, ...)parameter frame
not used. Argument exists for compatibility with S3 generic.
tolerance to decide when values are assumed to be equal, see plotValues().
additional arguments being passed to plotValues(), e.g. for subsetting.
A subset of the parameter frame x.