sparse_display_test

sparse_display_test, a MATLAB program which calls sparse_display() to read information defining a matrix of numbers and display the sparsity pattern or location of the nonzero elements using gnuplot. This operation is already available in the built-in MATLAB "spy" command.

Licensing:

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

Related Data and Programs:

sparse_display, a MATLAB library which can read information defining a matrix of numbers and display the sparsity pattern or location of the nonzero elements using gnuplot. This operation is already available in the built-in matlab "spy" command.

Source Code:

• sparse_display_test.m, calls all the tests.
• sparse_display_test.sh, runs all the tests.
• sparse_display_test.txt, the output file.

• sparse_display_test01.m, tests spy_ge().
• r8mat_uniform_01.m, returns a pseudorandom uniform R8MAT.
• wathen_ge.m, sets up the Wathen matrix in GE format.
• wathen_order.m, returns the size of the Wathen matrix.
• wathen_ge_data.txt, data defining the location of the nonzero entries of the Wathen matrix.
• wathen_ge_commands.txt, gnuplot commands to display the data.
• wathen_ge.png, an image of the sparsity pattern for the Wathen matrix.
• sparse_display_test02.m, tests spy_file().
• before_data.txt, data defining the location of the nonzero entries of a matrix, as created by DEAL.II.
• before_commands.txt, gnuplot commands to display the data.
• before.png, an image of the sparsity pattern for the before matrix.
• after_data.txt, data defining the location of the nonzero entries of a matrix, as created by DEAL.II (after reordering of variables).
• after_commands.txt, gnuplot commands to display the data.
• after.png, an image of the sparsity pattern for the after matrix.
• 30x20_data.txt, data defining the location of the nonzero entries of the 30x20 matrix.
• 30x20_commands.txt, gnuplot commands to display the data.
• 30x20.png, an image of the sparsity pattern for the 30x20 matrix.