[SciPy-Dev] utility for composing sparse matrices

[Robert Cimrman]

FYI: I have created a function that creates a sparse matrix from sparse 
(or dense) blocks, somewhat in the spirit of np.r_ and friends, see the 
example below.

Shall we add it to scipy.sparse? It may help to go around some of the 
fancy-indexing limitations.

r.

In [1]: from compose_sparse import compose_sparse

In [2]: %doctest_mode
*** Pasting of code with ">>>" or "..." has been enabled.
Exception reporting mode: Plain
Doctest mode is: ON
>>>     >>> import scipy.sparse as sps
>>>     >>> A = sps.csr_matrix([[1, 0], [0, 1]])
>>>     >>> B = sps.coo_matrix([[1, 1]])
>>>     >>> K = compose_sparse([[A, B.T], [B, 0]])
>>>     >>> print K.todense()
--> print(K.todense())
[[1 0 1]
  [0 1 1]
  [1 1 0]]
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