r8st
r8st,
an Octave code which
carries out some basic linear algebra operations on r8st matrices
(real 64 bit precision Sparse Triplet (I,J,AIJ) format).
Licensing:
The computer code and data files described and made available on this web page
are distributed under
the MIT license
Languages:
r8st 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.
Related Data and Programs:
r8st_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);

r8ge_print.m,
prints an R8GE matrix;

r8ge_print_some.m,
prints some of an R8GE matrix;

r8ncf_print.m,
prints an R8NCF matrix;

r8ncf_print_some.m,
prints some of an R8NCF matrix;

r8st_cg.m,
solves an r8st system using the conjugate gradient method;

r8st_check.m,
checks an r8st matrix for consistency.

r8st_diagonal.m,
reorders an r8st matrix so diagonal entries are first.

r8st_dif2.m,
returns the second difference matrix as an r8st.

r8st_ij_to_k.m,
returns the vector index of an (I,J) location in an r8st matrix;

r8st_indicator.m,
sets up an r8st indicator matrix;

r8st_jac_sl.m,
solves an r8st system using Jacobi iteration;

r8st_mtv.m,
multiplies a vector times an r8st matrix;

r8st_mv.m,
multiplies an r8st matrix times a vector;

r8st_print.m,
prints an r8st matrix;

r8st_print_some.m,
prints some of an r8st matrix;

r8st_random.m,
randomizes an r8st matrix.

r8st_read.m,
reads a square r8st matrix from a file.

r8st_read_size.m,
reads the size of a square r8st matrix from a file.

r8st_res.m,
returns the residual of an r8st linear system.

r8st_to_r8ge.m,
copies an r8st matrix to an R8GE matrix;

r8st_to_r8ncf.m,
copies an r8st matrix to an R8NCF matrix;

r8st_write.m,
writes a square r8st matrix to a file.

r8st_zeros.m,
zeros an r8st matrix;

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

r8vec_print.m,
prints an R8VEC;
Last revised on 22 May 2023.