# mne\_process\_raw: simple question
**URL:** https://mne.discourse.group/t/mne-process-raw-simple-question/448
**Category:** Mailing List Archive (read-only)
**Tags:** list-archive
**Created:** [May 21, 2012, 6:01pm UTC](https://mne.discourse.group/t/mne-process-raw-simple-question/448 "2012-05-21T18:01:25Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@system](https://mne.discourse.group/u/system)
#### Post date: [May 21, 2012, 6:01pm UTC](https://mne.discourse.group/t/mne-process-raw-simple-question/448/1 "2012-05-21T18:01:25Z")
Hi Everyone,
I am using mne\_process\_raw to compute averaged MEG and am unable to get output without using the -gave switch. Here's an example:
./mne\_process\_raw -ave file.ave -events file.eve -raw data.fif -raw data.fif -gave output.fif
As you can see, I have to transit the data file twice to fool it into thinking it's computing a grand average. - Embarrassing - but it would be nice to know how to do it correctly. Thanks.
Don
Don Krieger, Ph.D., D.ABNM
Department of Neurological Surgery
University of Pittsburgh
(412)648-9654
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### Author:  [@system](https://mne.discourse.group/u/system)
#### Post date: [May 21, 2012, 6:07pm UTC](https://mne.discourse.group/t/mne-process-raw-simple-question/448/2 "2012-05-21T18:07:37Z")
Hi Donald,
You should specify the output file (as well as log file and other
definitions) in your "file.ave" in this format:
outfile file.fif
I have included one of our ave files as a reference. Let me know if you
have further questions!
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### Author:  [@system](https://mne.discourse.group/u/system)
#### Post date: [May 21, 2012, 6:33pm UTC](https://mne.discourse.group/t/mne-process-raw-simple-question/448/3 "2012-05-21T18:33:37Z")
Hi Donald,
I don't know about making grand average .fif files, but you can make grand
average .stc (source time-course) files using mne\_average\_estimates (after
making individual subject average .fif, computing the inverse operator, and
then making individual subject .stc files)--I'm not sure if that's what
you're trying to do thought.
Best,
Steve
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### Author:  [@system](https://mne.discourse.group/u/system)
#### Post date: [May 21, 2012, 7:55pm UTC](https://mne.discourse.group/t/mne-process-raw-simple-question/448/4 "2012-05-21T19:55:02Z")
Thanks for the help. That did it.
Don
Don Krieger, Ph.D., D.ABNM
Department of Neurological Surgery
University of Pittsburgh
(412)648-9654