[Mne_analysis] Save data to certain format

[chanderler mei]

Dear all,

I loaded my eeg data from *.edf format files. After adding a duplicate
channel, I want to save the raw data back a *.edf format file:

raw.save('sample_edf.edf',overwrite=True)

The file seems to be much bigger than the original one, from 460,000 KB to
860,000 KB.

Also, when I try to import it to Matlab EEGLAB, it says:
EEGLAB error in function getfiletype() at line 1111:

Operands to be || and && operators must be convertible to logical scalar
values.

And then I try to open the *.edf file in EDFbrowser, and return error:
1th character of version field is not a valid 7-bit ASCII character. File
is not a valid EDF or BDF file.

I try to just read the *.edf file to python and save it to another *.edf
file, same errors occur.

QUESTION:
Is there a format of file I could export my raw data so that it is readable
in Matlab EEGLAB? Or is there a way to save the raw data to a readable
*.edf file?

Thank you very much for your time,

Sincerely,

Ning
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