[Mne_analysis] mne_ex_read_write_raw

[Alexandre Gramfort]

Dear Elisabeth,

the only thing that comes to my mind is to check the first_samp attribute of raw
(raw.first_samp) returned by fiff_setup_read_raw.m and check that it's
consistent
before and after ICA correction.

HTH
Alex

On Fri, Jan 4, 2013 at 6:09 PM, Elisabeth Fonteneau <ef309 at cam.ac.uk> wrote:
>
>
> Hello MNE users,
>
> I have a question regarding the function mne_ex_read_write_raw.m which
> allows to read and write back a raw fif file.
>
>
>
> We do have raw files that have been acquired in 2008 and at that time we
> exported the events (with mne_browse_raw, v2.6.0). The event file was in the
> old format (time correspond to time starting after the HPI -20s). Now if I’m
> am exporting again the event on the same data with the same mne_version
> (2.6.0) ,  my events will be in the new format (skipping HPI time on the
> first line + 0 0 and now the time correspond to trigger time + skipping
> time). If using the newer version (2.7.3) I do have the same thing. My first
> question is can we not export anymore event file in the old format even with
> an old mne_version(2.6.0)?
>
>
>
> I realise that the format event is not a problem, because mne_process_raw
> could handle both event formats for those files and creating an appropriate
> average (identical whatever the event format is).
>
>
>
> However here is my problem:
>
>
>
> We want to use the command mne_ex_read_write_raw.m (we are removing blinks
> with ICA and write back the raw fiff data). After re-writing the data in
> fiff format, mne_process_raw is not able anymore to handle the old event
> format (it is still detecting which format it is) but the average with the
> old format is wrong. If using the new format event, the average is correct.
>
>
>
> I am thinking that this function (mne_ex_read_write_raw.m) is missing to
> write back some information (in the header perhaps) that will help
> mne_process_raw (and potentially other mne_command) to handle the older
> format.
>
>
>
> An easy way will be to re-export all our events files (time comsuming), but
> I was wondering if you have another idea?
>
>
>
> Best,
>
> Elisabeth
>
>
>
> __________________________________________________________
>
>
>
> Dr Elisabeth Fonteneau
>
> Neurolex Group
>
> Department of Psychology
>
> University of Cambridge
>
> Downing Street, Cambridge CB2 3EB, UK
>
> Phone: +44 1223 333 548
>
> Email: ef309 at cam.ac.uk
>
> Web: www.neurolex.psychol.cam.ac.uk/directory/ef309 at cam.ac.uk
>
>
>
>
>
>
>
>
>
>
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