Value must be a 2-element vector of increasing or equal categorical values as ordered by the ruler Categories property. Value must be a vector of increasing categorical values as ordered by the ruler Categories property. Value must be a categorical vector of unique categories. Value to convert must be a numeric or categorical array. Ordinal data must be converted to the axes non-ordinal categories. Non-ordinal data must be converted to the axes ordinal categories. Ordinal categories must be compatible with the axes categories.