diff options
Diffstat (limited to 'numpy/lib/tests/test_polynomial.py')
| -rw-r--r-- | numpy/lib/tests/test_polynomial.py | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/numpy/lib/tests/test_polynomial.py b/numpy/lib/tests/test_polynomial.py index cd0b90dc4..6c3e4fa02 100644 --- a/numpy/lib/tests/test_polynomial.py +++ b/numpy/lib/tests/test_polynomial.py @@ -227,6 +227,20 @@ class TestPolynomial: v = np.arange(1, 21) assert_almost_equal(np.poly(v), np.poly(np.diag(v))) + def test_zero_poly_dtype(self): + """ + Regression test for gh-16354. + """ + z = np.array([0, 0, 0]) + p = np.poly1d(z.astype(np.int64)) + assert_equal(p.coeffs.dtype, np.int64) + + p = np.poly1d(z.astype(np.float32)) + assert_equal(p.coeffs.dtype, np.float32) + + p = np.poly1d(z.astype(np.complex64)) + assert_equal(p.coeffs.dtype, np.complex64) + def test_poly_eq(self): p = np.poly1d([1, 2, 3]) p2 = np.poly1d([1, 2, 4]) @@ -243,6 +257,15 @@ class TestPolynomial: assert_equal(q.coeffs.dtype, np.complex128) assert_equal(r.coeffs.dtype, np.complex128) assert_equal(q*a + r, b) + + c = [1, 2, 3] + d = np.poly1d([1, 2, 3]) + s, t = np.polydiv(c, d) + assert isinstance(s, np.poly1d) + assert isinstance(t, np.poly1d) + u, v = np.polydiv(d, c) + assert isinstance(u, np.poly1d) + assert isinstance(v, np.poly1d) def test_poly_coeffs_mutable(self): """ Coefficients should be modifiable """ |