Sparse Matrix Manipulation
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+ `issparse`_ determine whether input is sparse
+ `nnz`_ number of non zero entries in a matrix
+ `speye`_ sparse identity matrix
+ `spones`_ sparse matrix
+ `sprand`_ sparse random matrix
+ `spzeros`_ sparse zero matrix


.. _speye: speye.html
.. _spones: spones.html
.. _spzeros: spzeros.html
.. _nnz: nnz.html
.. _issparse: issparse.html
.. _sprand: sprand.html