allow NULL/NA for label replacement functions

fmichonneau / phylobase

An R package that provides a base S4 class for comparative methods, incorporating one or more trees and trait data

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Closed fmichonneau closed 9 years ago

fmichonneau commented 10 years ago

tipLabels(tree) <- NA
tipLabels(tree) <- NA
nodeLabels(tree) <- NA
nodeLabels(tree) <- NULL

should all work