r8ccs

r8ccs, an Octave code which carries out some basic linear algebra operations on R8CCS matrices, real Compressed Column Storage (Colptr, Row, Value) format.

Licensing:

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

Languages:

r8ccs 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:

r8ccs_test

ccs_io, an Octave code which reads and writes sparse linear systems stored in the Compressed Column Storage (CCS) format.

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);
• i4vec_print.m, prints an I4VEC;
• i4vec_search_binary_a.m, uses binary search on an ascending sorted I4VEC to find the occurrence of a given value;
• r8ccs_dif2.m, sets the second difference as an r8ccs matrix.
• r8ccs_get.m, gets an entry from an r8ccs matrix.
• r8ccs_ijk.m, gets the sparse index from the full indices in an r8ccs matrix.
• r8ccs_inc.m, increments an entry from an r8ccs matrix.
• r8ccs_indicator.m, returns an r8ccs indicator matrix;
• r8ccs_kij.m, gets the full indices from the sparse index in an r8ccs matrix.
• r8ccs_mtv.m, computes b=A'*x, where A is an r8ccs matrix;
• r8ccs_mv.m, computes b=A*x, where A is an r8ccs matrix;
• r8ccs_print.m, prints an r8ccs matrix;
• r8ccs_print_some.m, prints some of an r8ccs matrix;
• r8ccs_random.m, randomizes an r8ccs matrix;
• r8ccs_read.m, reads an r8ccs matrix from three files;
• r8ccs_read_size.m, reads the sizes associated with an r8ccs matrix stored in three files;
• r8ccs_set.m, sets an entry in an r8ccs matrix.
• r8ccs_to_r8ge.m, solves an r8ccs linear system;
• r8ccs_write.m, writes an r8ccs matrix to three files;
• r8ccs_zeros.m, zeros an r8ccs matrix;
• r8ge_print.m, prints an R8GE matrix;
• r8ge_print_some.m, prints some of an R8GE matrix;
• r8vec_print.m, prints an R8VEC;