laplacian, a Python code which evaluates a discretized approximation to the Laplacian operator on data on an evenly spaced grid, within a circle, an interval, or a torus. For the case of the interval, the data may be supplied on an unevenly spaced grid.
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laplacian is available in a MATLAB version and an Octave version and a Python version.
test_matrix, a Python code which defines test matrices for which some of the determinant, eigenvalues, inverse, null vectors, P*L*U factorization or linear system solution are already known.