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Viewing changes to numpy/dft/tests/test_helper.py

  • Committer: Bazaar Package Importer
  • Author(s): Matthias Klose
  • Date: 2006-07-12 10:00:24 UTC
  • Revision ID: james.westby@ubuntu.com-20060712100024-5lw9q2yczlisqcrt
Tags: upstream-0.9.8
Import upstream version 0.9.8

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numpy/dft/tests/test_helper.py
 
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#!/usr/bin/env python
 
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# Copied from fftpack.helper by Pearu Peterson, October 2005
 
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""" Test functions for fftpack.helper module
 
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"""
 
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import sys
 
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from numpy.testing import *
 
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set_package_path()
 
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from numpy.dft import fftshift,ifftshift,fftfreq
 
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del sys.path[0]
 
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from numpy import pi
 
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def random(size):
 
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    return rand(*size)
 
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class test_fftshift(ScipyTestCase):
 
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    def check_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 check_inverse(self):
 
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        for n in [1,4,9,100,211]:
 
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            x = random((n,))
 
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            assert_array_almost_equal(ifftshift(fftshift(x)),x)
 
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class test_fftfreq(ScipyTestCase):
 
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    def check_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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if __name__ == "__main__":
 
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    ScipyTest().run()