55 lines
1.7 KiB
Python
55 lines
1.7 KiB
Python
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# Created by Pearu Peterson, September 2002
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__usage__ = """
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Build fftpack:
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python setup_fftpack.py build
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Run tests if scipy is installed:
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python -c 'import scipy;scipy.fftpack.test(<level>)'
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Run tests if fftpack is not installed:
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python tests/test_helper.py [<level>]
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"""
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from numpy.testing import assert_array_almost_equal
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from scipy.fftpack import fftshift, ifftshift, fftfreq, rfftfreq
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from numpy import pi, random
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class TestFFTShift(object):
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def test_definition(self):
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x = [0,1,2,3,4,-4,-3,-2,-1]
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y = [-4,-3,-2,-1,0,1,2,3,4]
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assert_array_almost_equal(fftshift(x),y)
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assert_array_almost_equal(ifftshift(y),x)
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x = [0,1,2,3,4,-5,-4,-3,-2,-1]
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y = [-5,-4,-3,-2,-1,0,1,2,3,4]
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assert_array_almost_equal(fftshift(x),y)
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assert_array_almost_equal(ifftshift(y),x)
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def test_inverse(self):
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for n in [1,4,9,100,211]:
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x = random.random((n,))
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assert_array_almost_equal(ifftshift(fftshift(x)),x)
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class TestFFTFreq(object):
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def test_definition(self):
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x = [0,1,2,3,4,-4,-3,-2,-1]
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assert_array_almost_equal(9*fftfreq(9),x)
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assert_array_almost_equal(9*pi*fftfreq(9,pi),x)
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x = [0,1,2,3,4,-5,-4,-3,-2,-1]
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assert_array_almost_equal(10*fftfreq(10),x)
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assert_array_almost_equal(10*pi*fftfreq(10,pi),x)
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class TestRFFTFreq(object):
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def test_definition(self):
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x = [0,1,1,2,2,3,3,4,4]
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assert_array_almost_equal(9*rfftfreq(9),x)
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assert_array_almost_equal(9*pi*rfftfreq(9,pi),x)
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x = [0,1,1,2,2,3,3,4,4,5]
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assert_array_almost_equal(10*rfftfreq(10),x)
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assert_array_almost_equal(10*pi*rfftfreq(10,pi),x)
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