r8but, a Fortran90 code which carries out some basic linear algebra operations on R8BUT matrices (real 64 bit precision band upper triangular format).
The information on this web page is distributed under the MIT license.
r8but is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
linear_algebra, Fortran90 codes which carry out various linear algebra operations for matrices stored in a variety of formats.