Objects from the Class
Objects can be created by calls of the form new("afni", data, dim, dimnames, ...).Extends
Class "array", from data part.
Class "matrix", by class "array", distance 2, with
explicit test and coerce.
Class "structure", by class "array", distance 2.
Class "vector", by class "array", distance 3, with
explicit coerce.
Class "vector", by class "array", distance 5, with
explicit test and coerce.