[Mne_analysis] Pick a channel from the epoch data?

[Maria Hakonen]

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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