with James Overfelt The data structure used to describe an object is a reference to the data that it describes. Given this observation, it is natural to introduce references into sections of a given object. We call this a view into a linear algebra object. A view is identical to an object created using the calls in the last chapter, except that it references the same data as the parent object or view from which it was derived. Thus, a change to the values in the data that the view describes translates to a corresponding change in the data that the original object describes. It is legitimate to derive views from views. Indeed, in every way a view and object can and will be used interchangeably.