ScaLAPACK, version 1.2, includes routines for the solution of linear systems of equations, symmetric positive definite banded linear systems of equations, condition estimation and iterative refinement, for LU and Cholesky factorization, matrix inversion, full-rank linear least squares problems, orthogonal and generalized orthogonal factorizations, orthogonal transformation routines, reductions to upper Hessenberg, bidiagonal and tridiagonal form, reduction of a symmetric-definite generalized eigenproblem to standard form, the symmetric, generalized symmetric and the nonsymmetric eigenproblem.