FileNotFoundError: The path you specified, "slp01a.dat.lay",does not exist.

[soso-maitha]

Describe the bug

I get the following error when I try to read .dat file FileNotFoundError: The path you specified, "slp01a.dat.lay",does not exist.

Steps to reproduce

import os 
import mne
slp1a_data = mne.io.read_raw_persyst('slp01a.dat')

the data are from MIT-BIH Polysomnographic Database https://physionet.org/content/slpdb/1.0.0/

Expected results

Expected to read raw data from .dat file

Actual results

Error FileNotFoundError: The path you specified, "slp01a.dat.lay",does not exist.

I don't know why it is adding ".lay" at the end

Additional information

This is the output of mne.sys_info() Platform: Linux-5.4.0-1083-azure-x86_64-with-glibc2.10 Python: 3.8.5 (default, Sep 4 2020, 07:30:14) [GCC 7.3.0] Executable: /anaconda/envs/azureml_py38/bin/python CPU: x86_64: 6 cores Memory: 54.9 GB

mne: 1.0.3 numpy: 1.19.0 {blas=openblas, lapack=openblas} scipy: 1.5.2 matplotlib: 3.5.2 {backend=module://matplotlib_inline.backend_inline}

sklearn: 0.22.1 numba: 0.53.1 nibabel: Not found nilearn: Not found dipy: Not found cupy: Not found pandas: 1.1.5 pyvista: Not found pyvistaqt: Not found ipyvtklink: Not found vtk: Not found PyQt5: 5.15.7 ipympl: Not found pooch: v1.6.0

mne_bids: Not found mne_nirs: Not found mne_features: Not found mne_qt_browser: Not found mne_connectivity: Not found

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[drammock]

Are you sure the data come from a Persyst system? the .dat file extension is used by more than one manufacturer. There doesn't seem to be a .lay file, instead there is a .hea (header) file. cc @adam2392 who wrote the Persyst reader.

[adam2392]

I do not think the data comes from Persyst. So unfortunately no idea.

If it's a new system, would be nice to have it as a PR

[drammock]

@soso-maitha can you help by figuring out what the data format is? I skimmed https://ecg.mit.edu/george/publications/slpdb-pcn-1999.pdf but they don't mention Persyst.

[soso-maitha]

Hello, There are no .lay files. The signals are stored in .dat annotations in .st files headers in .hea format also there is .ecg but I am not using it.

I couldn't find details about the device, here is what is mentioned about the data.

The file format of the CD-ROM was the High-Sherra format standard.

Polysomnographic waveforms were displayed on CRT display and edited by using a program called WAVE (Waveform Analyzer, Viewer, and Editor) which was developed at Massachusetts Institute of Technology

[drammock]

I've never worked with this format so I'm not sure what else to say. Having a .dat extension in no way guarantees that the file contents are a valid persyst file, and the absence of a .lay file seems to support the hypothesis that it is in fact something else. On the contrary, if you are able to open the file in some other software (e.g., Persyst's proprietary software, or in Fieldtrip or Brainstorm) then that would indicate that it is our reader function that is too stringent. I suggest trying that and/or contacting the creators of the file to find out what the format is.

[KTibow]

Sorry for derailing this thread but anyone know how to parse the ECG files from the same paper? I've tried so much stuff and I have no idea what type of file this is Edit: I think it's just a bunch of concatenated 2 byte integers Edit 2: There's documentation https://archive.physionet.org/physiobank/database/slpdb/slpdb.shtml