[Mne_analysis] MNE-Python -- RawArray Info Question

[Mainak Jas]

I think you forgot to transpose your matrix before supplying it to RawArray
:)

On Thu, Dec 25, 2014 at 10:12 PM, Alexandre Gramfort <
alexandre.gramfort at telecom-paristech.fr> wrote:

> hi Sam,
>
> > I am trying out some new preprocessing tricks recommended by some
> > collaborators, which involves bandstop filtering my data to the
> frequencies
> > of electrical artifact (60, 120, 180 Hz, etc), and subtracting the
> resulting
> > time courses from the true data. (Their claim is that this preserves
> > coherence.) To do so, I have been trying the RawArray function, but am
> > having trouble passing it an Info instance. Even using the following code
> > produces the error reproduced below. This is surprising, as I'm only
> > translating an instance of raw to a PANDAS dataframe, and then a Numpy
> > array. Any advice?
>
> you don't need to have a pandas dataframe as you already have a numpy
> array in raw._data
>
> so raw_mat is just raw._data
>
> also a recommendation is to never use numpy matrices but just arrays.
>
> HTH
> Alex
>
> > raw = mne.io.Raw('some_data.fif', preload=True)
> > raw_df = raw.as_data_frame()
> > raw_mat = raw_df.as_matrix()
> > new_raw = mne.io.RawArray(raw_mat, raw.info)
> >
> > ValueError                                Traceback (most recent call
> last)
> > <ipython-input-162-10b3fdc10c23> in <module>()
> >       1 raw_mat = raw.as_data_frame()
> >       2 raw_mat = raw_mat.as_matrix()
> > ----> 3 new_raw = mne.io.RawArray(raw_mat, raw.info)
> >
> > /mne/io/array/array.pyc in __init__(self, data, info, verbose)
> >
> > /mne/utils.pyc in verbose(function, *args, **kwargs)
> >     549         return ret
> >     550     else:
> > --> 551         ret = function(*args, **kwargs)
> >     552         return ret
> >     553
> >
> >
> /usr/pubsw/packages/python/anaconda/lib/python2.7/site-packages/mne/io/array/array.pyc
> > in __init__(self, data, info, verbose)
> >      39
> >      40         if len(data) != len(info['ch_names']):
> > ---> 41             raise ValueError('len(data) does not match
> > len(info["ch_names"])')
> >      42         assert len(info['ch_names']) == info['nchan']
> >      43
> >
> > ValueError: len(data) does not match len(info["ch_names"])
> >
> >
> > Best,
> > Sam Zorowitz
> >
> > Clinical Research Coordinator
> > Department of Psychiatry: Neurosciences
> > Division of Neurotherapeutics
> > Massachusetts General Hospital
> >
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