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import numpy as np
from numpy.testing import TestCase, run_module_suite, \
assert_array_equal, assert_raises
from scipy.signal._arraytools import axis_slice, axis_reverse, \
odd_ext, even_ext, const_ext
class TestArrayTools(TestCase):
def test_axis_slice(self):
a = np.arange(12).reshape(3, 4)
s = axis_slice(a, start=0, stop=1, axis=0)
assert_array_equal(s, a[0:1, :])
s = axis_slice(a, start=-1, axis=0)
assert_array_equal(s, a[-1:, :])
s = axis_slice(a, start=0, stop=1, axis=1)
assert_array_equal(s, a[:, 0:1])
s = axis_slice(a, start=-1, axis=1)
assert_array_equal(s, a[:, -1:])
s = axis_slice(a, start=0, step=2, axis=0)
assert_array_equal(s, a[::2, :])
s = axis_slice(a, start=0, step=2, axis=1)
assert_array_equal(s, a[:, ::2])
def test_axis_reverse(self):
a = np.arange(12).reshape(3, 4)
r = axis_reverse(a, axis=0)
assert_array_equal(r, a[::-1, :])
r = axis_reverse(a, axis=1)
assert_array_equal(r, a[:, ::-1])
def test_odd_ext(self):
a = np.array([[1, 2, 3, 4, 5],
[9, 8, 7, 6, 5]])
odd = odd_ext(a, 2, axis=1)
expected = np.array([[-1, 0, 1, 2, 3, 4, 5, 6, 7],
[11, 10, 9, 8, 7, 6, 5, 4, 3]])
assert_array_equal(odd, expected)
odd = odd_ext(a, 1, axis=0)
expected = np.array([[-7, -4, -1, 2, 5],
[ 1, 2, 3, 4, 5],
[ 9, 8, 7, 6, 5],
[17, 14, 11, 8, 5]])
assert_array_equal(odd, expected)
assert_raises(ValueError, odd_ext, a, 2, axis=0)
assert_raises(ValueError, odd_ext, a, 5, axis=1)
def test_even_ext(self):
a = np.array([[1, 2, 3, 4, 5],
[9, 8, 7, 6, 5]])
even = even_ext(a, 2, axis=1)
expected = np.array([[3, 2, 1, 2, 3, 4, 5, 4, 3],
[7, 8, 9, 8, 7, 6, 5, 6, 7]])
assert_array_equal(even, expected)
even = even_ext(a, 1, axis=0)
expected = np.array([[ 9, 8, 7, 6, 5],
[ 1, 2, 3, 4, 5],
[ 9, 8, 7, 6, 5],
[ 1, 2, 3, 4, 5]])
assert_array_equal(even, expected)
assert_raises(ValueError, even_ext, a, 2, axis=0)
assert_raises(ValueError, even_ext, a, 5, axis=1)
def test_const_ext(self):
a = np.array([[1, 2, 3, 4, 5],
[9, 8, 7, 6, 5]])
const = const_ext(a, 2, axis=1)
expected = np.array([[1, 1, 1, 2, 3, 4, 5, 5, 5],
[9, 9, 9, 8, 7, 6, 5, 5, 5]])
assert_array_equal(const, expected)
const = const_ext(a, 1, axis=0)
expected = np.array([[ 1, 2, 3, 4, 5],
[ 1, 2, 3, 4, 5],
[ 9, 8, 7, 6, 5],
[ 9, 8, 7, 6, 5]])
assert_array_equal(const, expected)
if __name__ == "__main__":
run_module_suite()
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