Class "Surv", directly.
Class "'>matrix", directly.
Class "'>oldClass", by class "Surv", distance 2.
Class "'>structure", by class "matrix", distance 2.
Class "'>array", by class "matrix", distance 2.
Class "'>vector", by class "matrix", distance 3, with explicit coerce.
Class "'>vector", by class "matrix", distance 4, with explicit coerce.