| -snes_lag_preconditioner <lag> | - . -snes_lag_jacobian <lag>
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| -snes_test_jacobian | - compare the user provided Jacobian with one compute via finite differences to check for errors
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| -snes_test_jacobian_display | - display the user provided Jacobian, the finite difference Jacobian and the difference between them to help users detect the location of errors in the user provided Jacobian
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| -snes_test_jacobian_display_threshold <numerical value> | - display entries in the difference between the user provided Jacobian and finite difference Jacobian that are greater than a certain value to help users detect errors
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| -snes_compare_explicit | - Compare the computed Jacobian to the finite difference Jacobian and output the differences
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| -snes_compare_explicit_draw | - Compare the computed Jacobian to the finite difference Jacobian and draw the result
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| -snes_compare_explicit_contour | - Compare the computed Jacobian to the finite difference Jacobian and draw a contour plot with the result
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| -snes_compare_operator | - Make the comparison options above use the operator instead of the preconditioning matrix
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| -snes_compare_coloring | - Compute the finite difference Jacobian using coloring and display norms of difference
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| -snes_compare_coloring_display | - Compute the finite differece Jacobian using coloring and display verbose differences
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| -snes_compare_coloring_threshold | - Display only those matrix entries that differ by more than a given threshold
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| -snes_compare_coloring_threshold_atol | - Absolute tolerance for difference in matrix entries to be displayed by -snes_compare_coloring_threshold
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| -snes_compare_coloring_threshold_rtol | - Relative tolerance for difference in matrix entries to be displayed by -snes_compare_coloring_threshold
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| -snes_compare_coloring_draw | - Compute the finite differece Jacobian using coloring and draw differences
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| -snes_compare_coloring_draw_contour | - Compute the finite differece Jacobian using coloring and show contours of matrices and differences
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