The band Indexing Function
The band indexing function can be used to construct rtable objects of type Array or Matrix.
As a parameter to the Matrix constructor, this indexing function can take either of the following forms.
1. The band[b] indexing function specifies that the constructed object is a band Matrix with b non-zero subdiagonals and b non-zero superdiagonals.
2. The band[b1, b2] indexing function specifies that the constructed object is a band Matrix with b1 non-zero subdiagonals and b2 non-zero superdiagonals.
The values of b1 and b2 are stored separately from the data in the Matrix data structure.
The specification is the same in the construction of an Array.
M ≔ Matrix⁡w,w,w,x,x,x,x,y,y,y,y,z,z,z,shape=band1,2,scan=band1,2
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