r8st

r8st, a MATLAB 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;