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Sparse uniformly distributed random matrix
R = sprand(S) R = sprand(m,n,density) R = sprand(m,n,density,rc)
R = sprand(S)
has the same sparsity structure as S, but uniformly distributed random entries.
R = sprand(m,n,density)
is a random, m-by-n, sparse matrix with approximately density*m*n uniformly distributed nonzero entries (0 
density 1).
R = sprand(m,n,density,rc)
also has reciprocal condition number approximately equal to rc. R is constructed from a sum of matrices of rank one.
If rc is a vector of length lr, where lr min(m,n), then R has rc as its first lr singular values, all others are zero. In this case, R is generated by random plane rotations applied to a diagonal matrix with the given singular values. It has a great deal of topological and algebraic structure.
sprandn Sparse normally distributed random matrix
sprandsym Sparse symmetric random matrix