`readsignal` fails to retrieve data

[rr1017]

The function fails to retrieve data with the following error:

read -1, less than 921600 requested!!!

The edf file for which this happens is readily available from physionet.org (chb01_01.edf)

[DimitriPapadopoulos]

Are you certain the file is an error-free EDF file?

Please provide a link to a compliant EDF file.

[DimitriPapadopoulos]

Found a chb01_01.edf file in the CHB-MIT Scalp EEG Database.

[DimitriPapadopoulos]

This works for me:

import pyedflib

signals, signal_headers, header = pyedflib.highlevel.read_edf("chb01_01.edf")

How to reproduce the error?

[rr1017]

That was the file I was using, I see pyedflib.highlevel.read_edf works but I just wonder why readSignal on the EdfReader class won’t work.

So, if I create an instance of EdfReader with that file and I try to use the readSignal(chn=1) method it fails.

I have switched to using the “mne” library anyway which has similar functionalities but I would recommend attempting to solve this issue.

Best regards,

Ruben Ruiz-Mateos Serrano MRes+PhD Connected Electronic and Photonic Systems Department of Engineering University of Cambridge / UCL

From: Dimitri Papadopoulos @.> Sent: 27 June 2023 11:15 To: @.> Cc: Ruiz-Mateos Serrano, @.>; @.> Subject: Re: [holgern/pyedflib] readsignal fails to retrieve data (Issue #228)

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This works for me:

import pyedflib

signals, signal_headers, header = pyedflib.highlevel.read_edf("chb01_01.edf")

How to reproduce the error?

— Reply to this email directly, view it on GitHubhttps://github.com/holgern/pyedflib/issues/228#issuecomment-1609209529, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AKSEWTKEX6I67TNUM5B2MDLXNKXCHANCNFSM6AAAAAAZULQ4VU. You are receiving this because you authored the thread.Message ID: @.***>

[skjerns]

I cannot reproduce the issue, I assume the problem is with the code you are using and not a problem with pyedflib.

import pyedflib
with pyedflib.EdfReader('chb01_01.edf') as f:
    n = f.signals_in_file
    signal_labels = f.getSignalLabels()
    print(n, signal_labels)
    f.readSignal(1)