(octave.info)Sparse Matrices in Oct-Files

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A.1.6 Sparse Matrices in Oct-Files
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There are three classes of sparse objects that are of interest to the
user.

‘SparseMatrix’
     A double precision sparse matrix class

‘SparseComplexMatrix’
     A complex sparse matrix class

‘SparseBoolMatrix’
     A boolean sparse matrix class

   All of these classes inherit from the ‘Sparse<T>’ template class, and
so all have similar capabilities and usage.  The ‘Sparse<T>’ class was
based on Octave’s ‘Array<T>’ class and users familiar with Octave’s
‘Array’ classes will be comfortable with the use of the sparse classes.

   The sparse classes will not be entirely described in this section,
due to their similarity with the existing ‘Array’ classes.  However,
there are a few differences due the nature of sparse objects, and these
will be described.  First, although it is fundamentally possible to have
N-dimensional sparse objects, the Octave sparse classes do not allow
them at this time; All instances of the sparse classes *must* be
2-dimensional.  This means that ‘SparseMatrix’ is actually more similar
to Octave’s ‘Matrix’ class than it is to the ‘NDArray’ class.

Array and Sparse Class Differences

Creating Sparse Matrices in Oct-Files

Using Sparse Matrices in Oct-Files