[Mne_analysis] Pick a channel from the epoch data?

Mon Oct 27 11:47:33 EDT 2014

Hi, Maria,

what do you get if you type:

'MEG0242' in epochs_condition_1.ch_names

-Denis

2014-10-27 16:44 GMT+01:00 Maria Hakonen <maria.hakonen at gmail.com>:

> I think that the space is not the problem because at least in the case of
> evoked data 'MEG 0242' works. I also tried condition_1.pick_channels(['MEG0242'])
> but got an error:
>
> ----> 1 epochs_condition_1.pick_channels(['MEG0242'])
>
> /home/mhhakone/Downloads/mne-python/mne/channels.pyc in
> pick_channels(self, ch_names, copy)
>     148
>     149         idx = [inst.ch_names.index(c) for c in ch_names if c in
> inst.ch_names]
> --> 150         inst._pick_drop_channels(idx)
>     151
>     152         return inst
>
> /home/mhhakone/Downloads/mne-python/mne/channels.pyc in
> _pick_drop_channels(self, idx)
>     192             self.cals = self.cals[idx]
>     193
> --> 194         self.info = pick_info(self.info, idx, copy=False)
>     195
>     196         if inst_has('_projector'):
>
> /home/mhhakone/Downloads/mne-python/mne/io/pick.pyc in pick_info(info,
> sel, copy)
>     285
>     286     if len(sel) == 0:
> --> 287         raise ValueError('Warning : No channels match the
> selection.')
>     288
>     289     info['chs'] = [info['chs'][k] for k in sel]
>
> ValueError: Warning : No channels match the selection.
>
> -Maria
>
> 2014-10-27 17:32 GMT+02:00 Laetitia Grabot <laetitia.grabot at gmail.com>:
>
>> You should try without the space between MEG and 0242, like this:
>> epochs_condition_1.pick_channels(['MEG0242'])
>> Normally it works!
>>
>> 2014-10-27 16:22 GMT+01:00 Maria Hakonen <maria.hakonen at gmail.com>:
>>
>>> Hi,
>>>
>>> I tried that as:
>>> epochs_condition_1.pick_channels(['MEG 0242'])
>>>
>>> but got an error:
>>>
>>> ----> 1 epochs_condition_1.pick_channels(['MEG 0242'])
>>>
>>> /home/mhhakone/Downloads/mne-python/mne/channels.pyc in
>>> pick_channels(self, ch_names, copy)
>>>     148
>>>     149         idx = [inst.ch_names.index(c) for c in ch_names if c in
>>> inst.ch_names]
>>> --> 150         inst._pick_drop_channels(idx)
>>>     151
>>>     152         return inst
>>>
>>> /home/mhhakone/Downloads/mne-python/mne/channels.pyc in
>>> _pick_drop_channels(self, idx)
>>>     187
>>>     188         if inst_has('picks'):
>>> --> 189             self.picks = self.picks[idx]
>>>     190
>>>     191         if inst_has('cals'):
>>>
>>> IndexError: index 22 out of bounds 0<=index<0
>>>
>>> Could someone please let me know what I am doing wrong?
>>>
>>> epochs_condition_1 is:
>>>
>>> epochs_condition_1
>>> Out[40]: <Epochs  |  n_events : 160 (all good), tmin : -0.0999936018905
>>> (s), tmax : 0.999936018905 (s), baseline : (-0.09999360144138336, 0.0)>
>>>
>>> Thanks,
>>> Maria
>>>
>>> 2014-10-27 17:02 GMT+02:00 Laetitia Grabot <laetitia.grabot at gmail.com>:
>>>
>>>> Hi,
>>>> There is a method that you can apply to your epochs object to select a
>>>> channel:
>>>> epochs.pick_channels()
>>>>
>>>> Laetitia
>>>>
>>>> 2014-10-27 15:52 GMT+01:00 Maria Hakonen <maria.hakonen at gmail.com>:
>>>>
>>>>> Hi,
>>>>>
>>>>> I have loaded epochs with mne.read_epochs and would need to pick a
>>>>> channel from the epoch data. I wonder if there is any function to do this?
>>>>> mne.pick_channels_evoked seems to work for evoked data, but I haven't found
>>>>> the corresponding function for epochs.
>>>>>
>>>>> Thanks,
>>>>> Maria
>>>>>
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>>
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