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2024 Apr 05
1
duplicated() on zero-column data frames returns empty
...row.names are required to be unique. I'm sure that more interpretations can be devised, requiring some other behaviour for duplicated() and friends. Thankfully, duplicated() and anyDuplicated() are generic functions, and you can subclass your data frames to change their behaviour: duplicated.database_relation <- function(x, incomparables = FALSE, ...) if (length(x)) return(NextMethod()) else c( FALSE, rep(TRUE, nrow(x) - 1) ) .S3method('duplicated', 'database_relation') anyDuplicated.database_relation <- function( x, incomparables = FALSE, ... ) if (nrow(x) > 1) 2 els...