Get a data set from a taxmap object

Get a data set from a taxmap object and complain if it does not exist.

Arguments

obj	A taxmap object
data	Dataset name, index, or a logical vector that indicates which dataset in obj$data to add columns to.

Examples

if (FALSE) {
# Get data set by name
get_dataset(ex_taxmap, "info")

# Get data set by indeex_taxmap
get_dataset(ex_taxmap, 1)

# Get data set by T/F vector
get_dataset(ex_taxmap, startsWith(names(ex_taxmap$data), "i"))

}