For each individual in a pedigree, count the number of generations since its most distant pedigree founder.
getGenerations(Ped, StopIfInvalid = TRUE)dataframe, pedigree with the first three columns being id - dam - sire. Column names are ignored, as are additional columns.
if a pedigree loop is detected, stop with an error (TRUE, default) or return the Pedigree, to see where the problem(s) occur.
A vector with the generation number for each individual, starting at 0 for founders. NA indicates a pedigree loop where an individual is its own ancestor (or that the pedigree has >1000 generations). Returned invisibly to be a part of QC.