| http://www.w3.org/ns/prov#value | - R's object system is based on the class attribute. (OK, I really mean the simpler of R's two object systems, but let's avoid that topic.) Attributes are also used to turn one-dimensional vectors into multi-dimensional structures by specifying their dimensions, as we will see next.Matrices and arraysMatrices and arrays are special types of vectors, distinguished by having a dim (dimensions) attribute
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