Abstract. LAPACK90 is a set of LAPACK90 subroutines which interfaces FORTRAN90 with LAPACK. All LAPACK driver subroutines including expert drivers and some LAPACK computationals have both generic LAPACK90 interfaces and generic LAPACK77 interfaces. The remaining computationals have only generic LAPACK77 interfaces. In both types of interfaces no distinction is made between single and double precision or between real and complex data types. 1 LAPACK LAPACK is a library of FORTRAN 77 subroutines for solving the most commonly occurring problems in numerical linear algebra. It has been designed to be e cient on a wide range of modern high-performance computers. The name LAPACK is an acronym for Linear Algebra PACKage. LAPACK provides routines for solving systems of simultaneous linear equations, least-squares solutions of linear systems of equations, eigenvalue problems, andsingularvalueproblems.The associated matrixfactorizations LU, Cholesky, QR, SVD, Schur, generalized Schur are also pr...