# How to save the preprocessed data in EEGLAB to.fIf format?

**URL:** <https://mne.discourse.group/t/how-to-save-the-preprocessed-data-in-eeglab-to-fif-format/3827>\
**Category:** Support & Discussions\
**Tags:** eeg, epochs\
**Created:** [October 17, 2021, 12:09am UTC](https://mne.discourse.group/t/how-to-save-the-preprocessed-data-in-eeglab-to-fif-format/3827 "2021-10-17T00:09:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![MissDan1995](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/missdan1995/32/895_2.png) [@MissDan1995](https://mne.discourse.group/u/MissDan1995)\
**Post date:** [October 17, 2021, 12:09am UTC](https://mne.discourse.group/t/how-to-save-the-preprocessed-data-in-eeglab-to-fif-format/3827/1 "2021-10-17T00:09:09Z")

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**If you have a question or issue with MNE-Python, please include the following info:**

- MNE-Python version: 0.21.2
- operating system: windows 10

Dear MEG developers,  
I am encountering a problematic situation while saving epochs. I would like to take EEGLAB preprocessed EEG data from . set format conversion to .fif format , but it fails to save with this RuntimeWarning message:  
C:\Users\SCEL.spyder-py3\temp.py:19: RuntimeWarning: This filename (26 post\_ica\_1.fif) does not conform to MNE naming conventions. All epochs files should end with -epo.fif, -epo.fif.gz, \_epo.fif or \_epo.fif.gz  
data.save(subjects+’ post\_ica\_1.fif’,overwrite=True)  
How can I solve this issue?  
I need some help. Thanks!  
Best,  
Dan

```python
import hypyp
import numpy as np
import mne
from mne.preprocessing import ICA
from mne.time_frequency import tfr_morlet
subjects=0
allsub = ['01','02','03','04','05','06','07','08','09','10','11','12','13','14','15','16','17','18','19','20','21','22','23','24','25','26'];
for subjects in allsub:
    data_path='C:\\wangdan\\study 2\\EC_ICA\\'+subjects+' post_ica_1.set'
    data=mne.io.read_epochs_eeglab(data_path)
    data_path_save = 'C:\\wangdan\\study 2\\EC_ICA\\'+subjects+' post_ica_1.fif'
    data.save(subjects+' post_ica_1.fif',overwrite=True)

```

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<div class="post-metadata">

**Author:** ![agramfort](https://avatars.discourse-cdn.com/v4/letter/a/7c8e57/32.png) [@agramfort](https://mne.discourse.group/u/agramfort)\
**Post date:** [October 17, 2021, 11:19am UTC](https://mne.discourse.group/t/how-to-save-the-preprocessed-data-in-eeglab-to-fif-format/3827/2 "2021-10-17T11:19:10Z")

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hi Dan

it’s not an error but just a warning.

to avoid this warning use:

post\_ica\_1-epo.fif

for the filename

Alex

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<div class="post-metadata">

**Author:** ![MissDan1995](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/missdan1995/32/895_2.png) [@MissDan1995](https://mne.discourse.group/u/MissDan1995)\
**Post date:** [October 18, 2021, 8:03am UTC](https://mne.discourse.group/t/how-to-save-the-preprocessed-data-in-eeglab-to-fif-format/3827/4 "2021-10-18T08:03:54Z")

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Thank you for your helpful advice!