r85
r85,
a MATLAB code which
carries out some basic linear algebra operations on R85 matrices
(real 64 bit precision pentadiagonal format).
Licensing:
The computer code and data files described and made available on this web page
are distributed under
the GNU LGPL license.
Languages:
r85 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:
r85_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;

r85_dif2.m,
returns an R85 second difference matrix;

r85_indicator.m,
returns an R85 indicator matrix;

r85_mtv.m,
multiplies a vector times an R85 matrix;

r85_mv.m,
multiplies an R85 matrix times a vector;

r85_np_fs.m,
factors and solves an R85 linear system with no pivoting;

r85_print.m,
prints an R85 matrix;

r85_print_some.m,
prints some of an R85 matrix;

r85_random.m,
randomizes an R85 matrix;

r85_to_r8ge.m,
copies an R85 matrix to an R8GE matrix;

r85_zeros.m,
zeros an R85 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 22 August 2022.