[FieldTrip] MNE fiff_read / write_raw_segment

[Peter Goodin]

Hi Alex, 

Sorry, that "add" in the first sentence is a little misleading. Please accept my apologies. 

I'm trying to alter an existing channel with new values, not add a new channel. If the channel already exists but is having the data rewritten, do any changes need to be made to fh.info.ch or any other aspect of fh?

Thanks and sorry for the confusion again. 

Peter.
__________________________
Peter Goodin,
BSc (Hons), Ph.D Candidate.

Brain and Psychological Sciences Research Centre (BPsych)
Swinburne University,
Hawthorn, Vic, 3122

Monash Alfred Psychiatry Research Centre (MAPrc)
Level 1, Old Baker Building
Commercial Road
Melbourne, Vic, 3004



________________________________________
From: fieldtrip-bounces at science.ru.nl [fieldtrip-bounces at science.ru.nl] on behalf of Alexandre Gramfort [alexandre.gramfort at inria.fr]
Sent: Thursday, 24 January 2013 5:38 PM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] MNE fiff_read / write_raw_segment

hi Peter,

when you add channels to a fif structure you need to update the measurement
information (channels names, types etc.). With your notations you should update
fh.info.chs

hope this helps
Alex

On Thu, Jan 24, 2013 at 2:59 AM, Peter Goodin <pgoodin at swin.edu.au> wrote:
> Hi Fieldtrip list,
>
> I'm trying to add an altered channel and save it as a new fiff file using
> the MNE commands from the external/MNE dir in Fieldtrip, but seem to just
> keep getting the data from the old fiff file instead.
>
> The code I'm currently using is:
>
> To read:
> fh = fiff_setup_read_raw('input.fif');
> f = fiff_read_raw_segment(fh);
>
> After adding in the altered channel data to f, I then use:
>
> fiff_write_raw_segment(output.fif, fh);
>
> What I thought would happen is output.fif would use the information in f and
> fh to write output.fif, but what seems to be happening is the data in f is
> being ignored.
>
> Does anyone have any ideas on how to insert the altered channel data then
> write it back out as a fiff file?
>
> Thanks,
>
> Peter.
>
>
>
>
> __________________________
> Peter Goodin,
> BSc (Hons), Ph.D Candidate.
>
> Brain and Psychological Sciences Research Centre (BPsych)
> Swinburne University,
> Hawthorn, Vic, 3122
>
> Monash Alfred Psychiatry Research Centre (MAPrc)
> Level 1, Old Baker Building
> Commercial Road
> Melbourne, Vic, 3004
>
>
>
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