46 lines
1.1 KiB
Python
46 lines
1.1 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Mon Jan 15 19:45:33 2018
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@author: anne
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"""
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import numpy as np
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from lasp import Fft, getFreq
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def test_forward_fft():
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"""
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Test that our FFT implementation equals Numpy's rfft implementation
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"""
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nfft = 2048
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t = np.linspace(0, 1.0, nfft, endpoint=False)
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freq = 10
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omg = 2*np.pi*freq
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sig = np.cos(omg*t)+10
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sig = np.random.randn(nfft)
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fft_lasp = Fft(nfft)
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res_lasp = fft_lasp.fft(sig)[:,0]
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res_npy = np.fft.rfft(sig)
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assert(np.isclose(np.linalg.norm(res_lasp- res_npy), 0))
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def test_backward_fft():
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"""
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Test that our backward FFT implementation equals Numpy's rfft implementation
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"""
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nfft = 2048
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freq = getFreq(nfft, nfft)
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# Sig = np.zeros(nfft//2+1, dtype=complex)
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Sigr = np.random.randn(nfft//2+1)
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Sigi = np.random.randn(nfft//2+1)
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Sig = Sigr + 1j*Sigi
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fft_lasp = Fft(nfft)
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sig_lasp = fft_lasp.ifft(Sig)[:,0]
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sig_py = np.fft.irfft(Sig)
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assert(np.isclose(np.linalg.norm(sig_py- sig_lasp), 0))
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