QRINT is a suite of Fortran 77 codes that approximates the
orthogonal factor Q in the QR factorization of a fundamental
matrix solution (or part thereof) of a linear system.
The codes integrate the differential equations defining the
factor Q by representing Q as product of elementary Householder
reflectors or Givens rotations. Various input/output options
are provided, and we refer to the code itself for further
documentation. In particular, please read the README file
and the user interface in the soubroutine "qrint.f"
and Erik S. Van Vleck,
These codes are provided for the benefit of the scientific
community. While the authors decline any responsibility for
possible malfunctioning of the codes, they will welcome
any and all comments on bugs, recommended changes, and the like.
If you use these codes, the authors would appreciate your
acknowledging having done so in the reports, publications,
theses, etc., resulting from their use.
The authors gratefully acknowledge the support of the
National Science Foundation (NSF) during the time period
in which these codes were written.
To use the codes, save the zip file below in
the directory where you are going to put the codes. Upon
having saved the file, "zip -a" it, and then you are ready.
[With E. VanVleck. In Future Generation Computer Systems 19-3 (2003), pp. 363-373.]