r8lt

r8lt, an Octave code which carries out some basic linear algebra operations on R8LT matrices (real 64 bit precision lower triangular format).

Licensing:

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

Languages:

r8lt 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:

r8lt_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;
• r8ge_random.m, returns a random R8GE matrix;
• r8ge_to_r8lt.m, converts an R8GE matrix to an R8LT matrix;
• r8lt_det.m, computes the determinant of an R8LT matrix;
• r8lt_indicator.m, returns an R8LT indicator matrix;
• r8lt_inverse.m, returns the inverse of an R8LT matrix;
• r8lt_mm.m, computes the product A*B of two R8LT matrices.
• r8lt_mtm.m, computes the product A*B of two R8LT matrices.
• r8lt_mtv.m, multiplies a vector times an R8LT matrix;
• r8lt_mv.m, multiplies an R8LT matrix times a vector;
• r8lt_print.m, prints an R8LT matrix;
• r8lt_print_some.m, prints some of an R8LT matrix;
• r8lt_random.m, randomizes an R8LT matrix;
• r8lt_sl.m, solves an R8LT linear system A*x=b;
• r8lt_slt.m, solves an R8LT linear system A'*x=b;
• r8lt_to_r8ge.m, converts an R8LT matrix to an R8GE matrix;
• r8lt_zeros.m, zeros out space for an R8LT matrix.
• r8vec_indicator1.m, sets an R8VEC to the indicator1 vector;
• r8vec_print.m, prints an R8VEC;