r8bb

r8bb, an Octave code which carries out some basic linear algebra operations on R8BB matrices (real 64 bit precision 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:

r8bb 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:

r8bb_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;
• r8bb_add.m, adds a value to an entry in an R8BB matrix;
• r8bb_dif2.m, returns an R8BB second difference matrix;
• r8bb_fa.m, factors an R8BB matrix;
• r8bb_get.m, gets the value of an entry in an R8BB matrix;
• r8bb_indicator.m, returns an R8BB indicator matrix;
• r8bb_mtv.m, computes b=A'*x, where A is an R8BLT matrix.
• r8bb_mv.m, computes b=A*x, where A is an R8BLT matrix.
• r8bb_print.m, prints an R8BB matrix;
• r8bb_print_some.m, prints some of an R8BB matrix;
• r8bb_random.m, returns a random R8BB matrix;
• r8bb_set.m, sets one entry of an R8BB matrix;
• r8bb_sl.m, solves a linear system that was factored by R8BB_FA;
• r8bb_to_r8ge.m, copies an R8BB matrix to an R8GE matrix;
• r8bb_zeros.m, zeros an R8BB matrix;
• r8gb_fa.m, performs a LINPACK style PLU factorization of an R8GB matrix;
• r8gb_sl.m, solves a system factored by R8GB_FA;
• r8gb_to_r8vec.m, copies an R8GB matrix to an R8VEC;
• 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;
• 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_print_some.m, prints some of an R8VEC;
• r8vec_to_r8gb.m, converts an R8VEC to an R8GB matrix;
• r8vec_to_r8ge.m, converts an R8VEC to an R8GE matrix;