quadrilateral_witherden_rule_test, a C++ code which calls quadrilateral_witherden_rule(), which returns Witherden quadrature rules, with exactness up to total degree 21, over the interior of a quadrilateral.
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quadrilateral_witherden_rule, a C++ code which returns Witherden quadrature rules, with exactness up to total degree 21, over the interior of a quadrilateral.