S7 bundles S3 definitions for key S3 classes provided by the base packages:
class_data.framefor data frames.class_Datefor dates.class_factorfor factors.class_POSIXct,class_POSIXltandclass_POSIXtfor date-times.class_formulafor formulas.
S7 bundles S3 definitions for key S3 classes provided by the base packages:
class_data.frame for data frames.
class_Date for dates.
class_factor for factors.
class_POSIXct, class_POSIXlt and class_POSIXt for date-times.
class_formula for formulas.