diff options
Diffstat (limited to 'numpy/polynomial/tests/test_chebyshev.py')
| -rw-r--r-- | numpy/polynomial/tests/test_chebyshev.py | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/numpy/polynomial/tests/test_chebyshev.py b/numpy/polynomial/tests/test_chebyshev.py index 2e4344731..74701af1a 100644 --- a/numpy/polynomial/tests/test_chebyshev.py +++ b/numpy/polynomial/tests/test_chebyshev.py @@ -471,6 +471,26 @@ class TestFitting(object): assert_almost_equal(coef1, coef2) +class TestInterp(object): + + @staticmethod + def f(x): + return x * (x - 1) * (x - 2) + + def test_raises(self): + assert_raises(ValueError, cheb.chebinterp, self.f, -1, [-1, 1]) + assert_raises(ValueError, cheb.chebinterp, self.f, 10.1, [-1, 1]) + + def test_dimensions(self): + for i in range(1, 5): + assert_(cheb.chebinterp(self.f, i, [-1, 1]).shape == (i+1,)) + + def test_approx(self): + assert_almost_equal(cheb.chebinterp(lambda x: [1, 1, 1, 1], 3, [-1, 1]), np.array([1, 0, 0, 0])) + assert_almost_equal(cheb.chebinterp(lambda x: x, 3, [-1, 1]), np.array([0, 1, 0, 0])) + assert_almost_equal(cheb.chebinterp(self.f, 3, [-1, 1]), np.array([-3/2, 11/4, -3/2, 1/4])) + + class TestCompanion(object): def test_raises(self): |