<div dir="ltr"><div class="gmail_extra">you are doing:</div><div class="gmail_extra"><br></div><div class="gmail_extra">data_EEG.apply_hilbert(n_jobs=1, envelope=False)<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">which operates in place and so next time you want to filter</div><div class="gmail_extra">you have complex valued data.</div><div class="gmail_extra"><br></div><div class="gmail_extra">you need to do</div><div class="gmail_extra"><br></div><div class="gmail_extra">raw_hilbert = data_EEG.copy().apply_hilbert(n_jobs=1, envelope=False)</div><div class="gmail_extra"><br></div><div class="gmail_extra">please close if you confirm.</div></div>