R8LTT
Lower Triangular Toeplitz Matrix Utilities

R8LTT is a Python code which carries out some basic linear algebra operations on R8LTT matrices (real 64 bit precision lower triangular Toeplitz format).

Licensing:

The information on this web page is distributed under the MIT 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:

linear_algebra, a Python code which carries 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.py, returns the integer part of the logarithm base 10 of abs(X);
• r8_uniform_01.py, is a uniform random number generator;
• r8ge_mm.py, computes C=A*B, where A, B, and C are R8GE matrices.
• r8ge_mtm.py, computes C=A'*B, where A, B, and C are R8GE matrices.
• r8ge_print.py, prints an R8GE matrix.
• r8ge_print_some.py, prints some of an R8GE matrix.
• r8ltt.py, functions to apply to a matrix stored in R8LTT format.
• r8vec_indicator1.py, sets an R8VEC to the indicator vector;
• r8vec_print.py, prints an R8VEC;
• r8vec_uniform_01.py, returns a pseudorandom R8VEC;
• timestamp.py, prints the current YMDHMS date as a timestamp;

Examples and Tests:

• r8ltt_test.py, calls all the tests;
• r8ltt_test.sh, runs all the tests;
• r8ltt_test.txt, the output from all the tests;

You can go up one level to the MATLAB source codes.