band_qr, a Fortran90 code which includes LAPACK-style routines to compute the QR factorization of a banded matrix, by Alfredo Remon, Enrique Quintana-Orti, Gregorio Quintana-Orti.
The distinguishing features of these routines include the fact that
The routines, as originally developed, did not include a routine to solve linear systems A*x=b once the QR factors had been computed. A routine DGBBQRS() has been written to carry out this computation in cases where the QR factors were computed using DGBBQR2(), that is, the unblocked code.
This software library includes routines which are distributed under a separate license. Each such routine is individually marked with the following information:
Copyright (c) 2007, Universidad Jaume I de Castellon
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Code not covered under the above license is made available under the GNU LGPL license.
band_qr is available in a FORTRAN90 version.
lapack, a FORTRAN90 library which contains modern linear algebra routines.
LINPLUS, a FORTRAN90 library which carries out some linear algebra operations on matrices in a variety of formats.
Certain routines in this library represent the work of:
Alfredo Remon, Enrique Quintana-Orti, Gregorio Quintana-Orti,
Dept. de Ingenieria y Ciencia de Computadores, Universidad Jaume I,
12.080 Castellon, Spain,
{gquintan,remon,quintana}@icc.uji.es