[Mne_analysis] Pick a channel from the epoch data?

Maria Hakonen maria.hakonen at gmail.com
Wed Oct 29 02:08:16 EDT 2014
Search archives: 
Hi,

pick_channels worked correctly when I restatred Python yesterday, so the
problem is solwed.

Thank you for your help anyway!

-Maria


2014-10-27 18:03 GMT+02:00 Denis-Alexander Engemann <
denis.engemann at gmail.com>:

> Ok. The error message tells you what we just saw: you need to pass the
> exact channel name to remove the channel from the data. Why you get an
> indexing error when passing a valid channel name is unclear to me. Could
> you possibly share a mini-verison of your data. e.g. after croping them to
> a few samples e.g. using the .crop method.
>
> -Denis
>
>
>
>
> 2014-10-27 16:57 GMT+01:00 Maria Hakonen <maria.hakonen at gmail.com>:
>
>> 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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