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opSparseBinary
 opSparseBinary   Random sparse binary matrix.
 
    opSparseBinary(M,N) creates an M-by-N sparse binary matrix with
    min(M,8) nonzeros in each column.
 
    opSparseBinary(M,N,D) is the same as above, except that each
    column has min(M,D) nonzero elements.
 
    This matrix was suggested by Radu Berinde and Piotr Indyk,
    "Sparse recovery using sparse random matrices", MIT CSAIL TR
    2008-001, January 2008, http://hdl.handle.net/1721.1/40089
 
    Note that opSparseBinary calls RANDPERM and thus changes the state
    of RAND.
See also