SPARSEINV The sparseinv function computes the sparse inverse subset of a sparse matrix A. These entries in the inverse subset correspond to nonzero entries in the factorization of A. They can be computed without computing all of the entries in inv(A), so this method is much faster and takes much less memory than inv(A). If A is symmetric and positive definite, then all entries of the diagona of inv(A) are computed (as well as many off-diagonal terms. This version is restricted to real sparse matrices. A complex version is left for future work. Copyright (c) 2011, Timothy A. Davis Files sparseinv - computes the sparse inverse subset of a real sparse square matrix A. sparseinv_install - compiles and installs the sparseinv function. sparseinv_test - tests the sparseinv function.