Convert keep.these argument into logical vector
these2logical(these, data, these.target = "label")
character vector, integer vector, logical vector or
function that takes the variable mapped to the label
aesthetic as
first argument and returns a character vector or a logical vector. These
rows from data
are selected irrespective of the local density.
data.frame The plot layer's data set.
character The name of the variable (or aesthetic) in
which to select the target passed through these
.