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| """Tests for polyutils module. | |
| """ | |
| import numpy as np | |
| import numpy.polynomial.polyutils as pu | |
| from numpy.testing import ( | |
| assert_almost_equal, assert_raises, assert_equal, assert_, | |
| ) | |
| class TestMisc: | |
| def test_trimseq(self): | |
| for i in range(5): | |
| tgt = [1] | |
| res = pu.trimseq([1] + [0]*5) | |
| assert_equal(res, tgt) | |
| def test_as_series(self): | |
| # check exceptions | |
| assert_raises(ValueError, pu.as_series, [[]]) | |
| assert_raises(ValueError, pu.as_series, [[[1, 2]]]) | |
| assert_raises(ValueError, pu.as_series, [[1], ['a']]) | |
| # check common types | |
| types = ['i', 'd', 'O'] | |
| for i in range(len(types)): | |
| for j in range(i): | |
| ci = np.ones(1, types[i]) | |
| cj = np.ones(1, types[j]) | |
| [resi, resj] = pu.as_series([ci, cj]) | |
| assert_(resi.dtype.char == resj.dtype.char) | |
| assert_(resj.dtype.char == types[i]) | |
| def test_trimcoef(self): | |
| coef = [2, -1, 1, 0] | |
| # Test exceptions | |
| assert_raises(ValueError, pu.trimcoef, coef, -1) | |
| # Test results | |
| assert_equal(pu.trimcoef(coef), coef[:-1]) | |
| assert_equal(pu.trimcoef(coef, 1), coef[:-3]) | |
| assert_equal(pu.trimcoef(coef, 2), [0]) | |
| def test_vander_nd_exception(self): | |
| # n_dims != len(points) | |
| assert_raises(ValueError, pu._vander_nd, (), (1, 2, 3), [90]) | |
| # n_dims != len(degrees) | |
| assert_raises(ValueError, pu._vander_nd, (), (), [90.65]) | |
| # n_dims == 0 | |
| assert_raises(ValueError, pu._vander_nd, (), (), []) | |
| def test_div_zerodiv(self): | |
| # c2[-1] == 0 | |
| assert_raises(ZeroDivisionError, pu._div, pu._div, (1, 2, 3), [0]) | |
| def test_pow_too_large(self): | |
| # power > maxpower | |
| assert_raises(ValueError, pu._pow, (), [1, 2, 3], 5, 4) | |
| class TestDomain: | |
| def test_getdomain(self): | |
| # test for real values | |
| x = [1, 10, 3, -1] | |
| tgt = [-1, 10] | |
| res = pu.getdomain(x) | |
| assert_almost_equal(res, tgt) | |
| # test for complex values | |
| x = [1 + 1j, 1 - 1j, 0, 2] | |
| tgt = [-1j, 2 + 1j] | |
| res = pu.getdomain(x) | |
| assert_almost_equal(res, tgt) | |
| def test_mapdomain(self): | |
| # test for real values | |
| dom1 = [0, 4] | |
| dom2 = [1, 3] | |
| tgt = dom2 | |
| res = pu.mapdomain(dom1, dom1, dom2) | |
| assert_almost_equal(res, tgt) | |
| # test for complex values | |
| dom1 = [0 - 1j, 2 + 1j] | |
| dom2 = [-2, 2] | |
| tgt = dom2 | |
| x = dom1 | |
| res = pu.mapdomain(x, dom1, dom2) | |
| assert_almost_equal(res, tgt) | |
| # test for multidimensional arrays | |
| dom1 = [0, 4] | |
| dom2 = [1, 3] | |
| tgt = np.array([dom2, dom2]) | |
| x = np.array([dom1, dom1]) | |
| res = pu.mapdomain(x, dom1, dom2) | |
| assert_almost_equal(res, tgt) | |
| # test that subtypes are preserved. | |
| class MyNDArray(np.ndarray): | |
| pass | |
| dom1 = [0, 4] | |
| dom2 = [1, 3] | |
| x = np.array([dom1, dom1]).view(MyNDArray) | |
| res = pu.mapdomain(x, dom1, dom2) | |
| assert_(isinstance(res, MyNDArray)) | |
| def test_mapparms(self): | |
| # test for real values | |
| dom1 = [0, 4] | |
| dom2 = [1, 3] | |
| tgt = [1, .5] | |
| res = pu. mapparms(dom1, dom2) | |
| assert_almost_equal(res, tgt) | |
| # test for complex values | |
| dom1 = [0 - 1j, 2 + 1j] | |
| dom2 = [-2, 2] | |
| tgt = [-1 + 1j, 1 - 1j] | |
| res = pu.mapparms(dom1, dom2) | |
| assert_almost_equal(res, tgt) | |