r8but
r8but,
a MATLAB code which
carries out some basic linear algebra operations on R8BUT matrices
(real 64 bit precision band upper triangular format).
Licensing:
The computer code and data files described and made available on this web page
are distributed under
the GNU LGPL license.
Languages:
r8but is available in
a C version and
a C++ version and
a FORTRAN90 version and
a MATLAB version and
a Python version.
Related Data and Programs:
r8but_test
linear_algebra,
MATLAB codes which
carry out various linear algebra operations for matrices
stored in a variety of formats.
Source Code:

i4_log_10.m,
returns the integer part of the logarithm base 10 of abs(X);

r8_uniform_01.m,
is a uniform random number generator;

r8but_det.m,
returns the determinant of an R8BUT matrix;

r8but_indicator.m,
returns an R8BUT indicator matrix;

r8but_mtv.m,
multiplies a vector times an R8BUT matrix;

r8but_mv.m,
multiplies an R8BUT matrix times a vector;

r8but_print.m,
prints an R8BUT matrix;

r8but_print_some.m,
prints some of an R8BUT matrix;

r8but_random.m,
randomizes an R8BUT matrix;

r8but_sl.m,
solves A*x=b, where A is an R8BUT matrix;

r8but_slt.m,
solves A'*x=b, where A is an R8BUT matrix;

r8but_to_r8ge.m,
copies an R8BUT matrix to an R8GE matrix;

r8but_zeros.m,
zeros an R8BUT matrix;

r8ge_print.m,
prints an R8GE matrix;

r8ge_print_some.m,
prints some of an R8GE matrix;

r8vec_indicator1.m,
sets an R8VEC to the indicator1 vector;

r8vec_print.m,
prints an R8VEC;
Last revised on 19 August 2022.