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542 lines
19 KiB
542 lines
19 KiB
"""Test functions for matrix module
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"""
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from numpy.testing import (
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assert_equal, assert_array_equal, assert_array_max_ulp,
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assert_array_almost_equal, assert_raises, assert_
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)
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from numpy import (
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arange, add, fliplr, flipud, zeros, ones, eye, array, diag, histogram2d,
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tri, mask_indices, triu_indices, triu_indices_from, tril_indices,
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tril_indices_from, vander,
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)
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import numpy as np
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import pytest
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def get_mat(n):
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data = arange(n)
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data = add.outer(data, data)
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return data
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class TestEye:
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def test_basic(self):
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assert_equal(eye(4),
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array([[1, 0, 0, 0],
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[0, 1, 0, 0],
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[0, 0, 1, 0],
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[0, 0, 0, 1]]))
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assert_equal(eye(4, dtype='f'),
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array([[1, 0, 0, 0],
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[0, 1, 0, 0],
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[0, 0, 1, 0],
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[0, 0, 0, 1]], 'f'))
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assert_equal(eye(3) == 1,
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eye(3, dtype=bool))
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def test_uint64(self):
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# Regression test for gh-9982
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assert_equal(eye(np.uint64(2), dtype=int), array([[1, 0], [0, 1]]))
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assert_equal(eye(np.uint64(2), M=np.uint64(4), k=np.uint64(1)),
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array([[0, 1, 0, 0], [0, 0, 1, 0]]))
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def test_diag(self):
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assert_equal(eye(4, k=1),
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array([[0, 1, 0, 0],
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[0, 0, 1, 0],
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[0, 0, 0, 1],
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[0, 0, 0, 0]]))
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assert_equal(eye(4, k=-1),
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array([[0, 0, 0, 0],
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[1, 0, 0, 0],
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[0, 1, 0, 0],
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[0, 0, 1, 0]]))
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def test_2d(self):
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assert_equal(eye(4, 3),
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array([[1, 0, 0],
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[0, 1, 0],
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[0, 0, 1],
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[0, 0, 0]]))
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assert_equal(eye(3, 4),
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array([[1, 0, 0, 0],
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[0, 1, 0, 0],
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[0, 0, 1, 0]]))
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def test_diag2d(self):
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assert_equal(eye(3, 4, k=2),
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array([[0, 0, 1, 0],
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[0, 0, 0, 1],
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[0, 0, 0, 0]]))
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assert_equal(eye(4, 3, k=-2),
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array([[0, 0, 0],
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[0, 0, 0],
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[1, 0, 0],
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[0, 1, 0]]))
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def test_eye_bounds(self):
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assert_equal(eye(2, 2, 1), [[0, 1], [0, 0]])
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assert_equal(eye(2, 2, -1), [[0, 0], [1, 0]])
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assert_equal(eye(2, 2, 2), [[0, 0], [0, 0]])
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assert_equal(eye(2, 2, -2), [[0, 0], [0, 0]])
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assert_equal(eye(3, 2, 2), [[0, 0], [0, 0], [0, 0]])
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assert_equal(eye(3, 2, 1), [[0, 1], [0, 0], [0, 0]])
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assert_equal(eye(3, 2, -1), [[0, 0], [1, 0], [0, 1]])
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assert_equal(eye(3, 2, -2), [[0, 0], [0, 0], [1, 0]])
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assert_equal(eye(3, 2, -3), [[0, 0], [0, 0], [0, 0]])
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def test_strings(self):
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assert_equal(eye(2, 2, dtype='S3'),
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[[b'1', b''], [b'', b'1']])
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def test_bool(self):
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assert_equal(eye(2, 2, dtype=bool), [[True, False], [False, True]])
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def test_order(self):
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mat_c = eye(4, 3, k=-1)
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mat_f = eye(4, 3, k=-1, order='F')
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assert_equal(mat_c, mat_f)
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assert mat_c.flags.c_contiguous
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assert not mat_c.flags.f_contiguous
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assert not mat_f.flags.c_contiguous
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assert mat_f.flags.f_contiguous
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class TestDiag:
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def test_vector(self):
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vals = (100 * arange(5)).astype('l')
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b = zeros((5, 5))
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for k in range(5):
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b[k, k] = vals[k]
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assert_equal(diag(vals), b)
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b = zeros((7, 7))
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c = b.copy()
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for k in range(5):
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b[k, k + 2] = vals[k]
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c[k + 2, k] = vals[k]
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assert_equal(diag(vals, k=2), b)
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assert_equal(diag(vals, k=-2), c)
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def test_matrix(self, vals=None):
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if vals is None:
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vals = (100 * get_mat(5) + 1).astype('l')
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b = zeros((5,))
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for k in range(5):
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b[k] = vals[k, k]
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assert_equal(diag(vals), b)
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b = b * 0
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for k in range(3):
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b[k] = vals[k, k + 2]
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assert_equal(diag(vals, 2), b[:3])
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for k in range(3):
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b[k] = vals[k + 2, k]
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assert_equal(diag(vals, -2), b[:3])
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def test_fortran_order(self):
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vals = array((100 * get_mat(5) + 1), order='F', dtype='l')
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self.test_matrix(vals)
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def test_diag_bounds(self):
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A = [[1, 2], [3, 4], [5, 6]]
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assert_equal(diag(A, k=2), [])
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assert_equal(diag(A, k=1), [2])
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assert_equal(diag(A, k=0), [1, 4])
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assert_equal(diag(A, k=-1), [3, 6])
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assert_equal(diag(A, k=-2), [5])
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assert_equal(diag(A, k=-3), [])
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def test_failure(self):
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assert_raises(ValueError, diag, [[[1]]])
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class TestFliplr:
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def test_basic(self):
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assert_raises(ValueError, fliplr, ones(4))
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a = get_mat(4)
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b = a[:, ::-1]
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assert_equal(fliplr(a), b)
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a = [[0, 1, 2],
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[3, 4, 5]]
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b = [[2, 1, 0],
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[5, 4, 3]]
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assert_equal(fliplr(a), b)
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class TestFlipud:
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def test_basic(self):
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a = get_mat(4)
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b = a[::-1, :]
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assert_equal(flipud(a), b)
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a = [[0, 1, 2],
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[3, 4, 5]]
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b = [[3, 4, 5],
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[0, 1, 2]]
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assert_equal(flipud(a), b)
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class TestHistogram2d:
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def test_simple(self):
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x = array(
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[0.41702200, 0.72032449, 1.1437481e-4, 0.302332573, 0.146755891])
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y = array(
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[0.09233859, 0.18626021, 0.34556073, 0.39676747, 0.53881673])
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xedges = np.linspace(0, 1, 10)
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yedges = np.linspace(0, 1, 10)
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H = histogram2d(x, y, (xedges, yedges))[0]
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answer = array(
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[[0, 0, 0, 1, 0, 0, 0, 0, 0],
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[0, 0, 0, 0, 0, 0, 1, 0, 0],
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[0, 0, 0, 0, 0, 0, 0, 0, 0],
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[1, 0, 1, 0, 0, 0, 0, 0, 0],
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[0, 1, 0, 0, 0, 0, 0, 0, 0],
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[0, 0, 0, 0, 0, 0, 0, 0, 0],
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[0, 0, 0, 0, 0, 0, 0, 0, 0],
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[0, 0, 0, 0, 0, 0, 0, 0, 0],
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[0, 0, 0, 0, 0, 0, 0, 0, 0]])
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assert_array_equal(H.T, answer)
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H = histogram2d(x, y, xedges)[0]
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assert_array_equal(H.T, answer)
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H, xedges, yedges = histogram2d(list(range(10)), list(range(10)))
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assert_array_equal(H, eye(10, 10))
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assert_array_equal(xedges, np.linspace(0, 9, 11))
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assert_array_equal(yedges, np.linspace(0, 9, 11))
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def test_asym(self):
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x = array([1, 1, 2, 3, 4, 4, 4, 5])
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y = array([1, 3, 2, 0, 1, 2, 3, 4])
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H, xed, yed = histogram2d(
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x, y, (6, 5), range=[[0, 6], [0, 5]], density=True)
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answer = array(
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[[0., 0, 0, 0, 0],
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[0, 1, 0, 1, 0],
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[0, 0, 1, 0, 0],
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[1, 0, 0, 0, 0],
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[0, 1, 1, 1, 0],
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[0, 0, 0, 0, 1]])
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assert_array_almost_equal(H, answer/8., 3)
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assert_array_equal(xed, np.linspace(0, 6, 7))
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assert_array_equal(yed, np.linspace(0, 5, 6))
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def test_density(self):
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x = array([1, 2, 3, 1, 2, 3, 1, 2, 3])
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y = array([1, 1, 1, 2, 2, 2, 3, 3, 3])
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H, xed, yed = histogram2d(
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x, y, [[1, 2, 3, 5], [1, 2, 3, 5]], density=True)
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answer = array([[1, 1, .5],
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[1, 1, .5],
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[.5, .5, .25]])/9.
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assert_array_almost_equal(H, answer, 3)
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def test_all_outliers(self):
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r = np.random.rand(100) + 1. + 1e6 # histogramdd rounds by decimal=6
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H, xed, yed = histogram2d(r, r, (4, 5), range=([0, 1], [0, 1]))
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assert_array_equal(H, 0)
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def test_empty(self):
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a, edge1, edge2 = histogram2d([], [], bins=([0, 1], [0, 1]))
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assert_array_max_ulp(a, array([[0.]]))
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a, edge1, edge2 = histogram2d([], [], bins=4)
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assert_array_max_ulp(a, np.zeros((4, 4)))
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def test_binparameter_combination(self):
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x = array(
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[0, 0.09207008, 0.64575234, 0.12875982, 0.47390599,
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0.59944483, 1])
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y = array(
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[0, 0.14344267, 0.48988575, 0.30558665, 0.44700682,
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0.15886423, 1])
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edges = (0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1)
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H, xe, ye = histogram2d(x, y, (edges, 4))
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answer = array(
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[[2., 0., 0., 0.],
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[0., 1., 0., 0.],
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[0., 0., 0., 0.],
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[0., 0., 0., 0.],
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[0., 1., 0., 0.],
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[1., 0., 0., 0.],
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[0., 1., 0., 0.],
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[0., 0., 0., 0.],
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[0., 0., 0., 0.],
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[0., 0., 0., 1.]])
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assert_array_equal(H, answer)
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assert_array_equal(ye, array([0., 0.25, 0.5, 0.75, 1]))
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H, xe, ye = histogram2d(x, y, (4, edges))
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answer = array(
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[[1., 1., 0., 1., 0., 0., 0., 0., 0., 0.],
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[0., 0., 0., 0., 1., 0., 0., 0., 0., 0.],
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[0., 1., 0., 0., 1., 0., 0., 0., 0., 0.],
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[0., 0., 0., 0., 0., 0., 0., 0., 0., 1.]])
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assert_array_equal(H, answer)
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assert_array_equal(xe, array([0., 0.25, 0.5, 0.75, 1]))
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def test_dispatch(self):
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class ShouldDispatch:
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def __array_function__(self, function, types, args, kwargs):
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return types, args, kwargs
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xy = [1, 2]
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s_d = ShouldDispatch()
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r = histogram2d(s_d, xy)
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# Cannot use assert_equal since that dispatches...
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assert_(r == ((ShouldDispatch,), (s_d, xy), {}))
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r = histogram2d(xy, s_d)
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assert_(r == ((ShouldDispatch,), (xy, s_d), {}))
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r = histogram2d(xy, xy, bins=s_d)
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assert_(r, ((ShouldDispatch,), (xy, xy), dict(bins=s_d)))
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r = histogram2d(xy, xy, bins=[s_d, 5])
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assert_(r, ((ShouldDispatch,), (xy, xy), dict(bins=[s_d, 5])))
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assert_raises(Exception, histogram2d, xy, xy, bins=[s_d])
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r = histogram2d(xy, xy, weights=s_d)
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assert_(r, ((ShouldDispatch,), (xy, xy), dict(weights=s_d)))
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@pytest.mark.parametrize(("x_len", "y_len"), [(10, 11), (20, 19)])
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def test_bad_length(self, x_len, y_len):
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x, y = np.ones(x_len), np.ones(y_len)
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with pytest.raises(ValueError,
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match='x and y must have the same length.'):
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histogram2d(x, y)
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class TestTri:
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def test_dtype(self):
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out = array([[1, 0, 0],
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[1, 1, 0],
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[1, 1, 1]])
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assert_array_equal(tri(3), out)
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assert_array_equal(tri(3, dtype=bool), out.astype(bool))
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def test_tril_triu_ndim2():
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for dtype in np.typecodes['AllFloat'] + np.typecodes['AllInteger']:
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a = np.ones((2, 2), dtype=dtype)
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b = np.tril(a)
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c = np.triu(a)
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assert_array_equal(b, [[1, 0], [1, 1]])
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assert_array_equal(c, b.T)
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# should return the same dtype as the original array
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assert_equal(b.dtype, a.dtype)
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assert_equal(c.dtype, a.dtype)
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def test_tril_triu_ndim3():
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for dtype in np.typecodes['AllFloat'] + np.typecodes['AllInteger']:
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a = np.array([
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[[1, 1], [1, 1]],
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[[1, 1], [1, 0]],
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[[1, 1], [0, 0]],
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], dtype=dtype)
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a_tril_desired = np.array([
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[[1, 0], [1, 1]],
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[[1, 0], [1, 0]],
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[[1, 0], [0, 0]],
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], dtype=dtype)
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a_triu_desired = np.array([
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[[1, 1], [0, 1]],
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[[1, 1], [0, 0]],
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[[1, 1], [0, 0]],
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], dtype=dtype)
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a_triu_observed = np.triu(a)
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a_tril_observed = np.tril(a)
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assert_array_equal(a_triu_observed, a_triu_desired)
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assert_array_equal(a_tril_observed, a_tril_desired)
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assert_equal(a_triu_observed.dtype, a.dtype)
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assert_equal(a_tril_observed.dtype, a.dtype)
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def test_tril_triu_with_inf():
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# Issue 4859
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arr = np.array([[1, 1, np.inf],
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[1, 1, 1],
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[np.inf, 1, 1]])
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out_tril = np.array([[1, 0, 0],
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[1, 1, 0],
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[np.inf, 1, 1]])
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out_triu = out_tril.T
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assert_array_equal(np.triu(arr), out_triu)
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assert_array_equal(np.tril(arr), out_tril)
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def test_tril_triu_dtype():
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# Issue 4916
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# tril and triu should return the same dtype as input
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for c in np.typecodes['All']:
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if c == 'V':
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continue
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arr = np.zeros((3, 3), dtype=c)
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assert_equal(np.triu(arr).dtype, arr.dtype)
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assert_equal(np.tril(arr).dtype, arr.dtype)
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# check special cases
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arr = np.array([['2001-01-01T12:00', '2002-02-03T13:56'],
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['2004-01-01T12:00', '2003-01-03T13:45']],
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dtype='datetime64')
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assert_equal(np.triu(arr).dtype, arr.dtype)
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assert_equal(np.tril(arr).dtype, arr.dtype)
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arr = np.zeros((3, 3), dtype='f4,f4')
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assert_equal(np.triu(arr).dtype, arr.dtype)
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assert_equal(np.tril(arr).dtype, arr.dtype)
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def test_mask_indices():
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# simple test without offset
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iu = mask_indices(3, np.triu)
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a = np.arange(9).reshape(3, 3)
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assert_array_equal(a[iu], array([0, 1, 2, 4, 5, 8]))
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# Now with an offset
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iu1 = mask_indices(3, np.triu, 1)
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assert_array_equal(a[iu1], array([1, 2, 5]))
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def test_tril_indices():
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# indices without and with offset
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il1 = tril_indices(4)
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il2 = tril_indices(4, k=2)
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il3 = tril_indices(4, m=5)
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il4 = tril_indices(4, k=2, m=5)
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a = np.array([[1, 2, 3, 4],
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[5, 6, 7, 8],
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[9, 10, 11, 12],
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[13, 14, 15, 16]])
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b = np.arange(1, 21).reshape(4, 5)
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# indexing:
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assert_array_equal(a[il1],
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array([1, 5, 6, 9, 10, 11, 13, 14, 15, 16]))
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assert_array_equal(b[il3],
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array([1, 6, 7, 11, 12, 13, 16, 17, 18, 19]))
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# And for assigning values:
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a[il1] = -1
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assert_array_equal(a,
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array([[-1, 2, 3, 4],
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[-1, -1, 7, 8],
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[-1, -1, -1, 12],
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[-1, -1, -1, -1]]))
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b[il3] = -1
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assert_array_equal(b,
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array([[-1, 2, 3, 4, 5],
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[-1, -1, 8, 9, 10],
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[-1, -1, -1, 14, 15],
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[-1, -1, -1, -1, 20]]))
|
|
# These cover almost the whole array (two diagonals right of the main one):
|
|
a[il2] = -10
|
|
assert_array_equal(a,
|
|
array([[-10, -10, -10, 4],
|
|
[-10, -10, -10, -10],
|
|
[-10, -10, -10, -10],
|
|
[-10, -10, -10, -10]]))
|
|
b[il4] = -10
|
|
assert_array_equal(b,
|
|
array([[-10, -10, -10, 4, 5],
|
|
[-10, -10, -10, -10, 10],
|
|
[-10, -10, -10, -10, -10],
|
|
[-10, -10, -10, -10, -10]]))
|
|
|
|
|
|
class TestTriuIndices:
|
|
def test_triu_indices(self):
|
|
iu1 = triu_indices(4)
|
|
iu2 = triu_indices(4, k=2)
|
|
iu3 = triu_indices(4, m=5)
|
|
iu4 = triu_indices(4, k=2, m=5)
|
|
|
|
a = np.array([[1, 2, 3, 4],
|
|
[5, 6, 7, 8],
|
|
[9, 10, 11, 12],
|
|
[13, 14, 15, 16]])
|
|
b = np.arange(1, 21).reshape(4, 5)
|
|
|
|
# Both for indexing:
|
|
assert_array_equal(a[iu1],
|
|
array([1, 2, 3, 4, 6, 7, 8, 11, 12, 16]))
|
|
assert_array_equal(b[iu3],
|
|
array([1, 2, 3, 4, 5, 7, 8, 9,
|
|
10, 13, 14, 15, 19, 20]))
|
|
|
|
# And for assigning values:
|
|
a[iu1] = -1
|
|
assert_array_equal(a,
|
|
array([[-1, -1, -1, -1],
|
|
[5, -1, -1, -1],
|
|
[9, 10, -1, -1],
|
|
[13, 14, 15, -1]]))
|
|
b[iu3] = -1
|
|
assert_array_equal(b,
|
|
array([[-1, -1, -1, -1, -1],
|
|
[6, -1, -1, -1, -1],
|
|
[11, 12, -1, -1, -1],
|
|
[16, 17, 18, -1, -1]]))
|
|
|
|
# These cover almost the whole array (two diagonals right of the
|
|
# main one):
|
|
a[iu2] = -10
|
|
assert_array_equal(a,
|
|
array([[-1, -1, -10, -10],
|
|
[5, -1, -1, -10],
|
|
[9, 10, -1, -1],
|
|
[13, 14, 15, -1]]))
|
|
b[iu4] = -10
|
|
assert_array_equal(b,
|
|
array([[-1, -1, -10, -10, -10],
|
|
[6, -1, -1, -10, -10],
|
|
[11, 12, -1, -1, -10],
|
|
[16, 17, 18, -1, -1]]))
|
|
|
|
|
|
class TestTrilIndicesFrom:
|
|
def test_exceptions(self):
|
|
assert_raises(ValueError, tril_indices_from, np.ones((2,)))
|
|
assert_raises(ValueError, tril_indices_from, np.ones((2, 2, 2)))
|
|
# assert_raises(ValueError, tril_indices_from, np.ones((2, 3)))
|
|
|
|
|
|
class TestTriuIndicesFrom:
|
|
def test_exceptions(self):
|
|
assert_raises(ValueError, triu_indices_from, np.ones((2,)))
|
|
assert_raises(ValueError, triu_indices_from, np.ones((2, 2, 2)))
|
|
# assert_raises(ValueError, triu_indices_from, np.ones((2, 3)))
|
|
|
|
|
|
class TestVander:
|
|
def test_basic(self):
|
|
c = np.array([0, 1, -2, 3])
|
|
v = vander(c)
|
|
powers = np.array([[0, 0, 0, 0, 1],
|
|
[1, 1, 1, 1, 1],
|
|
[16, -8, 4, -2, 1],
|
|
[81, 27, 9, 3, 1]])
|
|
# Check default value of N:
|
|
assert_array_equal(v, powers[:, 1:])
|
|
# Check a range of N values, including 0 and 5 (greater than default)
|
|
m = powers.shape[1]
|
|
for n in range(6):
|
|
v = vander(c, N=n)
|
|
assert_array_equal(v, powers[:, m-n:m])
|
|
|
|
def test_dtypes(self):
|
|
c = array([11, -12, 13], dtype=np.int8)
|
|
v = vander(c)
|
|
expected = np.array([[121, 11, 1],
|
|
[144, -12, 1],
|
|
[169, 13, 1]])
|
|
assert_array_equal(v, expected)
|
|
|
|
c = array([1.0+1j, 1.0-1j])
|
|
v = vander(c, N=3)
|
|
expected = np.array([[2j, 1+1j, 1],
|
|
[-2j, 1-1j, 1]])
|
|
# The data is floating point, but the values are small integers,
|
|
# so assert_array_equal *should* be safe here (rather than, say,
|
|
# assert_array_almost_equal).
|
|
assert_array_equal(v, expected)
|