[Mne_analysis] Pick a channel from the epoch data?

[Laetitia Grabot]

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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