For the large sparse block two-by-two real nonsingular matrices, we establish a general framework of practical and efficient structured preconditioners through matrix transformation and matrix ...

Journal of Applied Probability, Vol. 27, No. 3 (Sep., 1990), pp. 557-576 (20 pages) In this paper we consider two-dimensional Markov chains with the property that, except for some boundary conditions, ...

Abstract: Recently, many applications about the recovery of block sparse signals have arisen, which can be casted as the recovery of a block sparse signal x from a measurement equation y = Φx. In this ...

(Randomized SVD: Structured vs. Gaussian): Ratio of RSVD apporimation error err_structured/err_gaussian for 2314 martrices from the SuiteSparse matrix repository ...