r83p

r83p, an Octave code which carries out some basic linear algebra operations on R83P matrices (real 64 bit precision tridiagonal periodic format).

Licensing:

The computer code and data files made available on this web page are distributed under the GNU LGPL license.

Languages:

r83p 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:

r83p_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);
• r83_np_fa.m, factors an R83 linear system with no pivoting;
• r83_np_ml.m, computes A * x or x * A, where A has been factored by R83_NP_FA;
• r83_np_sl.m, solves an R83 linear system factored by R83_NP_FA;
• r83p_det.m, computes the determinant of an R83P matrix factored by R83P_FA;
• r83p_fa.m, factors an R83P matrix;
• r83p_indicator.m, returns an R83P indicator matrix;
• r83p_ml.m, computes A*x or A'*x after A has been factored by R83P_FA;
• r83p_mtv.m, multiplies a vector times an R83P matrix;
• r83p_mv.m, multiplies an R83P matrix times a vector;
• r83p_print.m, prints an R83P matrix;
• r83p_print_some.m, prints some of an R83P matrix;
• r83p_random.m, randomizes an R83P matrix;
• r83p_sl.m, solves an R83P linear system factored by R83P_FA;
• r83p_to_r8ge.m, copies an R83P matrix to an R8GE matrix;
• r83p_zeros.m, zeros an R83P matrix;
• r8ge_det.m, computes the determinant of a factored R8GE matrix;
• r8ge_fa.m, factors an R8GE matrix;
• r8ge_print.m, prints an R8GE matrix;
• r8ge_print_some.m, prints some of an R8GE matrix;
• r8ge_sl.m, solves a linear system factored by R8GE_FA;
• r8vec_indicator1.m, sets an R8VEC to the indicator1 vector;
• r8vec_print.m, prints an R8VEC;
• r8vec2_print_some.m, prints some of a pair R8VEC's;