LINPACK is a collection of Fortran programs for solving various types of linear systems. The package is concerned with general, banded, symmetric indefinite, symmetric positive definite, triangular and tridiagonal square matrices, as well as with least-squares problems and the QR and singular value decompositions of rectangular matrices. The routines are designed to be completely machine independent, fully portable, and to run at near optimum efficiency in most operating environments. (RWR)