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answered 12 years ago
Look in the devel/sage/sage/matrix/ directory for examples. matrix_mpolynomial_dense.pyx looks like a pretty minimal example. matrix_symbolic_dense.pyx and matrix_double_dense.pyx might be good examples too.
devel/sage/sage/matrix/
matrix_mpolynomial_dense.pyx
matrix_symbolic_dense.pyx
matrix_double_dense.pyx