QuadratureElement: construct directly from a QuadratureRule

finat/quadrature_element.py

@@ -31,7 +31,12 @@ def make_quadrature_element(fiat_ref_cell, degree, scheme="default", codim=0):
     else:
         rule_ref_cell = fiat_ref_cell
 
-    rule = make_quadrature(rule_ref_cell, degree, scheme=scheme)
+    if isinstance(scheme, AbstractQuadratureRule):
+        rule = scheme
+        assert rule.ref_el == rule_ref_cell
+    else:
+        rule = make_quadrature(rule_ref_cell, degree, scheme=scheme)
+
     return QuadratureElement(fiat_ref_cell, rule)
 
 

test/finat/test_quadrature_element.py

@@ -0,0 +1,23 @@
+import pytest
+
+from FIAT import ufc_cell
+from finat.quadrature import make_quadrature
+from finat.quadrature_element import make_quadrature_element
+
+
+@pytest.fixture(params=["interval", "triangle", "interval * interval", "triangle * interval"])
+def cell(request):
+    return ufc_cell(request.param)
+
+
+def test_create_from_quadrature(cell):
+    degree = 4
+    scheme = "default"
+    fe1 = make_quadrature_element(cell, degree, scheme=scheme)
+
+    quadrature = make_quadrature(cell, degree, scheme=scheme)
+    fe2 = make_quadrature_element(cell, degree, scheme=quadrature)
+
+    Q1, ps1 = fe1.dual_basis
+    Q2, ps2 = fe2.dual_basis
+    assert ps1.almost_equal(ps2)