Adding fALFF script to git

fALFF

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+#Clean data using bandpass filtering Butterworth from Nilearn
+import nilearn
+time_series_cleaned = nilearn.signal.clean(time_series, sessions=None, detrend=True, standardize=None, confounds=None, low_pass=0.25, high_pass=0.01, t_r=2.0, ensure_finite=True)
+
+#Compute power spectra
+freqs_cleaned, psd_cleaned = signal.welch(time_series_cleaned, fs=0.5, window='boxcar', nperseg=None, noverlap=None, nfft=168, detrend='constant', return_onesided=False, scaling='spectrum', axis=-1, average='mean')
+
+#Compute fALFF
+low_freq=psd_cleaned[0,(freqs_cleaned>=0) & (freqs_cleaned<=0.08)]
+sum_low_freq = np.sum(low_freq)
+all_freq = psd_cleaned[0,(freqs_cleaned>=0) & (freqs_cleaned<=0.25)]
+sum_all_freq = np.sum(all_freq)
+fALFF=sum_low_freq/sum_all_freq
+
+