r8cbb

r8cbb, an Octave code which carries out some basic linear algebra operations on R8CBB matrices (real 64 bit precision compact border 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:

r8cbb 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:

r8cbb_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);
• i4_uniform_ab.m, returns a random integer in a given range;
• r8_uniform_01.m, is a uniform random number generator;
• r8cb_np_fa.m, factors an R8CB linear system with no pivoting;
• r8cb_np_sl.m, solves an R8CB linear system;
• r8cb_to_r8vec.m, copies an R8CB matrix to an R8VEC;
• r8cbb_add.m, adds a value to an entry of an R8CBB matrix;
• r8cbb_dif2.m, returns the second difference matrix as an R8CBB matrix;
• r8cbb_fa.m, factors an R8CBB matrix;
• r8cbb_get.m, gets one entry of an R8CBB matrix;
• r8cbb_indicator.m, returns an R8CBB indicator matrix;
• r8cbb_mtv.m, multiplies a vector times an R8CBB matrix;
• r8cbb_mv.m, multiplies a vector times an R8CBB matrix;
• r8cbb_print.m, prints an R8CBB matrix;
• r8cbb_print_some.m, prints some of an R8CBB matrix;
• r8cbb_random.m, returns a random R8CBB matrix;
• r8cbb_set.m, sets one entry of an R8CBB matrix;
• r8cbb_sl.m, solves a linear system factored by R8CBB_FA;
• r8cbb_to_r8ge.m, converts an R8CBB matrix to R8GE format;
• r8cbb_zeros.m, zeros an R8CBB matrix;
• r8ge_np_fa.m, factors an R8GE matrix by nonpivoting Gaussian elimination;
• r8ge_np_sl.m, solves a linear system factored by R8GE_NP_FA;
• r8ge_print.m, prints an R8GE matrix;
• r8ge_print_some.m, prints some of an R8GE matrix;
• r8ge_to_r8vec.m, converts an R8GE matrix to an R8VEC;
• 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;
• r8vec_to_r8ge.m, converts an R8VEC to an R8GE matrix;