r8cb

r8cb, an Octave code which carries out some basic linear algebra operations on R8CB matrices (real 64 bit precision compact banded format).

Licensing:

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

Languages:

r8cb 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:

r8cb_test

linear_algebra, an Octave code which carries 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;
• r8cb_det.m, returns the determinant of an R8CB matrix;
• r8cb_dif2t.m, returns the second difference matrix as an R8CB matrix;
• r8cb_indicator.m, returns an R8CB indicator matrix;
• r8cb_ml.m, computes A*x or A'*x after A has been factored by R8CB_NP_FA;
• r8cb_mtv.m, multiplies a vector times an R8CB matrix;
• r8cb_mv.m, multiplies an R8CB matrix times a vector;
• r8cb_np_fa.m, factors an R8CB linear system with no pivoting;
• r8cb_np_sl.m, solves an R8CB linear system;
• r8cb_print.m, prints an R8CB matrix;
• r8cb_print_some.m, prints some of an R8CB matrix;
• r8cb_random.m, randomizes an R8CB matrix;
• r8cb_to_r8ge.m, copies an R8CB matrix to an R8GE matrix;
• r8cb_to_r8vec.m, copies an R8CB matrix to an R8VEC;
• r8cb_zeros.m, zeros an R8CB 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;
• r8vec_indicator1.m, sets an R8VEC to the indicator1 vector;
• r8vec_print.m, prints an R8VEC;
• r8vec_to_r8cb.m, converts an R8VEC to an R8CB matrix;
• r8vec2_print.m, prints a pair R8VEC's;