[Mne_analysis] error when initiating a raw object

Alexandre Gramfort gramfort at nmr.mgh.harvard.edu
Tue Jan 8 13:09:02 EST 2013
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hi Andy,

can you read this file otherwise with mne_browse_raw or mne_process_raw?

if yes can you share the file via dropbox or any other service?

thanks
Alex

On Tue, Jan 8, 2013 at 6:14 PM, Dykstra, Andrew
<Andrew.Dykstra at med.uni-heidelberg.de> wrote:
> Dear MNE community,
>
> I am experiencing an error that I don't understand when trying to create
> a raw object in Python.  The traceback is below, and I only get this
> with the raw files from one subject.  I initially thought that it could
> be due to the abnormally large file sizes of this subject's raw data
> (~700 Mb), but I have one other subject whose raw data were comparable
> and I can create raw objects from those data without issue.
>
> Has anyone experienced this?
>
> Cheers,
> Andy
>
> error                                     Traceback (most recent call last)
> /home/andrew/Experiments/Awareness_wo_Attention/<ipython-input-8-5fbcd28d6772>
> in <module>()
> ----> 1
> runfile(r'/home/andrew/Experiments/Awareness_wo_Attention/py_tmp_check_dataset_channels.py',
> wdir=r'/home/andrew/Experiments/Awareness_wo_Attention')
>
> /usr/local/lib/python2.7/dist-packages/spyderlib/widgets/externalshell/sitecustomize.pyc
> in runfile(filename, args, wdir, namespace)
>      485             pass
>      486         os.chdir(wdir)
> --> 487     execfile(filename, namespace)
>      488     sys.argv = ['']
>      489     namespace.pop('__file__')
>
> /home/andrew/Experiments/Awareness_wo_Attention/py_tmp_check_dataset_channels.py
> in <module>()
>       48     for block in range(2):
>       49         fname.append(data_path + '/' + subject + '/meg/' +
> subject + '_block' + str(block+1) + '_cleaned_raw.fif')
> ---> 50         raw.append(mne.fiff.Raw(fname[block]))
>       51         chan.append(raw[block].ch_names)
>       52     chan.append([x for x in chan[0] if x not in set(chan[1])])
>
> /usr/local/lib/python2.7/dist-packages/mne-0.6.git-py2.7.egg/mne/utils.pyc
> in dec(*args, **kwargs)
>      263             return ret
>      264         else:
> --> 265             return function(*args, **kwargs)
>      266
>      267     # set __wrapped__ attribute so ?? in IPython gets the right
> source
>
>
> /usr/local/lib/python2.7/dist-packages/mne-0.6.git-py2.7.egg/mne/fiff/raw.pyc
> in __init__(self, fnames, allow_maxshield, preload, verbose, proj_active)
>       83
>       84         raws = [self._read_raw_file(fname, allow_maxshield,
> preload)
> ---> 85                 for fname in fnames]
>       86
>       87         _check_raw_compatibility(raws)
>
> /usr/local/lib/python2.7/dist-packages/mne-0.6.git-py2.7.egg/mne/utils.pyc
> in dec(*args, **kwargs)
>      263             return ret
>      264         else:
> --> 265             return function(*args, **kwargs)
>      266
>      267     # set __wrapped__ attribute so ?? in IPython gets the right
> source
>
>
> /usr/local/lib/python2.7/dist-packages/mne-0.6.git-py2.7.egg/mne/fiff/raw.pyc
> in _read_raw_file(self, fname, allow_maxshield, preload, verbose)
>      137         ext = os.path.splitext(fname)[1].lower()
>      138         whole_file = preload if '.gz' in ext else False
> --> 139         fid, tree, _ = fiff_open(fname, preload=whole_file)
>      140
>      141         #   Read the measurement info
>
>
> /usr/local/lib/python2.7/dist-packages/mne-0.6.git-py2.7.egg/mne/utils.pyc
> in dec(*args, **kwargs)
>      263             return ret
>      264         else:
> --> 265             return function(*args, **kwargs)
>      266
>      267     # set __wrapped__ attribute so ?? in IPython gets the right
> source
>
>
> /usr/local/lib/python2.7/dist-packages/mne-0.6.git-py2.7.egg/mne/fiff/open.pyc
> in fiff_open(fname, preload, verbose)
>       83         while tag.next >= 0:
>       84             pos = fid.tell()
> ---> 85             tag = read_tag_info(fid)
>       86             tag.pos = pos
>       87             directory.append(tag)
>
> /usr/local/lib/python2.7/dist-packages/mne-0.6.git-py2.7.egg/mne/fiff/tag.pyc
> in read_tag_info(fid)
>       67     """
>       68     s = fid.read(4 * 4)
> ---> 69     tag = Tag(*struct.unpack(">iiii", s))
>       70     if tag.next == 0:
>       71         fid.seek(tag.size, 1)
>
> error: unpack requires a string argument of length 16
>
> --
> Andrew R. Dykstra, PhD
> Auditory Cognition Lab
> Neurologie und Poliklinik
> Universitätsklinikum Heidelberg
> Im Neuenheimer Feld 400
> 69120 Heidelberg
>
> "How small the cosmos.  How paltry and puny compared to human consciousness . . . to a single individual recollection." - Vladimir Nabokov
>
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