r8ltt

r8ltt, an Octave code which carries out some basic linear algebra operations on R8LTT matrices (real 64 bit precision lower triangular Toeplitz format).

Licensing:

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

Languages:

r8ltt 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:

r8ltt_test

linear_algebra, MATLAB codes which carry out various linear algebra operations for matrices stored in a variety of formats.

Reference:

• Igor Podlubny,
  Matrix approach to discrete fractional calculus,
  Fractional Calculus and Applied Analysis,
  Volume 3, Number 4, pages 359-386, 2000.

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;
• r8ge_print.m, prints an R8GE matrix;
• r8ge_print_some.m, prints some of an R8GE matrix;
• r8ltt_det.m, computes the determinant of an R8LTT matrix;
• r8ltt_indicator.m, returns an R8LTT indicator matrix;
• r8ltt_inverse.m, returns the inverse of an R8LTT matrix;
• r8ltt_mm.m, computes the product A*B of two R8LTT matrices.
• r8ltt_mtm.m, computes the product A*B of two R8LTT matrices.
• r8ltt_mtv.m, multiplies a vector times an R8LTT matrix;
• r8ltt_mv.m, multiplies an R8LTT matrix times a vector;
• r8ltt_print.m, prints an R8UT matrix;
• r8ltt_print_some.m, prints some of an R8LTT matrix;
• r8ltt_random.m, randomizes an R8LTT matrix;
• r8ltt_sl.m, solves an R8LTT linear system A*x=b;
• r8ltt_slt.m, solves an R8LTT linear system A'*x=b;
• r8ltt_to_r8ge.m, converts an R8LTT matrix to an R8GE matrix;
• r8ltt_zeros.m, zeros out space for an R8LTT matrix.
• r8vec_indicator1.m, sets an R8VEC to the indicator1 vector;
• r8vec_print.m, prints an R8VEC;
• r8vec_uniform_01.m, returns an R8VEC of pseudorandom values.