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calls droplevels on the data.frame in spc@data.
# S4 method for hyperSpec droplevels(x, ...)
hyperSpec object
handed to droplevels
hyperSpec object with unused levels of all factors in @data dropped.
Use parameter except to exclude columns from dropping.
except
droplevels
# NOT RUN { chondro[1:3]$clusters droplevels (chondro [1:3])$clusters # }
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