def squareModulusFourier(data):
"""Compute square modulus Fourier coefficient of array data.
"""
# fft package
from scipy.fftpack import fftn as fft_sc
#from anfft import fftn as fft_an
# compute fft
data_fft = fft_sc(data)
# abs(fft)^2
data_fftabs =data_fft * data_fft.conjugate()
# return real part
return np.real(data_fftabs)
def tfft_scipy(df):
X=fft_sc(df['accel-x'])
Y=fft_sc(df['accel-y'])
Z=fft_sc(df['accel-z'])
return pd.DataFrame({'x': [sum(abs(X)**2)/len(df)],'y': [sum(abs(Y)**2)/len(df)], 'z':[sum(abs(Z)**2)/len(df)]})
def bench_fft_scipy(data):
"""Test scipy fft"""
fft_sc(data)
def bench_fft_scipy(data):
"""Test scipy fft"""
fft_sc(data)
