undefined_distribution-class: Undefined distribution class. This type of object is automatically created
in method toExplicitDistribution() when the user does not provide a concrete
distribution. This is because S4 objects do not accept NULL values.
Description
Undefined distribution class. This type of object is automatically created
in method toExplicitDistribution() when the user does not provide a concrete
distribution. This is because S4 objects do not accept NULL values.