lapack: lapack (Linear Algebra PACKage)
lapack: 
lapack: LAPACK provides routines for solving systems of simultaneous linear
lapack: equations, least-squares solutions of linear systems of equations,
lapack: eigenvalue problems, and singular value problems. The associated
lapack: matrix factorizations (LU, Cholesky, QR, SVD, Schur, generalized
lapack: Schur) are also provided, as are related computations such as
lapack: reordering of the Schur factorizations and estimating condition
lapack: numbers. Dense and banded matrices are handled, but not general sparse
lapack: matrices. In all areas, similar functionality is provided for real and
lapack: complex matrices, in both single and double precision.