[Mne_analysis] Pick a channel from the epoch data?
Maria Hakonen
maria.hakonen at gmail.com
Mon Oct 27 11:57:08 EDT 2014
Hi Denis,
That gives
In [57]: 'MEG0242' in epochs_condition_1.ch_names
Out[57]: False
but
In [58]: 'MEG 0242' in epochs_condition_1.ch_names
Out[58]: True
-Maria
2014-10-27 17:47 GMT+02:00 Denis-Alexander Engemann <
denis.engemann at gmail.com>:
> 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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