[Eeglablist] ICA error

[Erika Nyhus]

Hi Makoto,

I have 63 channels plus the reference.  After re-referencing to the average
reference and adding the reference channel back to the data there are 64
channels, the reference channel is channel 64.  I am selecting channels
1:63 for ICA.  This is when I get the error.  If I select channels 1:64 for
ICA it runs fine.

Erika

On Wed, Jan 3, 2018 at 2:28 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
wrote:

> Dear Erika,
>
> Your story confused me.
>
> > I am selecting 63 channels and excluding the reference channel for ICA.
> All the datasets are from the same subject and have been preprocessed in
> the same way.
>
> So you ran ICA on this 63 channels. Hence your EEG.icasphere has 63x63. I
> guess your EEG.icachansind is also 1x63.
>
> > I tried running ICA with 64 channels selected and it runs fine.
>
> Where did you get this 64 channel data, and why do you need to run
> different ICA on this (probably the original, non-channel-removed) data
> separately?
>
> It's like reading a detective story to me.
>
> Makoto
>
>
> On Wed, Jan 3, 2018 at 7:21 AM, Erika Nyhus <enyhus at bowdoin.edu> wrote:
>
>> Hi Tarik and Makoto,
>>
>> All datasets were re-referenced to the average reference and the
>> reference channel was added back to the data so there are 64 channels and
>> no bad channels.  I am selecting 63 channels and excluding the reference
>> channel for ICA.  All the datasets are from the same subject and have been
>> preprocessed in the same way.  I tried running ICA with 64 channels
>> selected and it runs fine.  I tried running ICA with the tutorial dataset
>> and selecting 31 channels and get the same error as in my datasets.
>>
>> Erika
>>
>> On Tue, Dec 26, 2017 at 6:22 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
>> wrote:
>>
>>> Dear Erika,
>>>
>>> If EEG.icasphere has 63 x 63 columns, it means ICA was computed on 63
>>> channels. How many channels did you have when you run ICA? Was the data
>>> full-ranked (no bridging across channels, no standard re-referencing before
>>> ICA)?
>>>
>>> Makoto
>>>
>>> On Wed, Dec 20, 2017 at 8:28 AM, Erika Nyhus <enyhus at bowdoin.edu> wrote:
>>>
>>>> I am getting the following error when I run ICA on a concatenated
>>>> datasets and selecting 63 of 64 channels.   When I run ICA on any of
>>>> the datasets individually I do not get an error.  I was wondering if anyone
>>>> has run in to this problem and how they were able to solve it.
>>>>
>>>> eeg_checkset error: number of elements in 'icachansind' (64)
>>>> does not match the number of columns in the sphere array (63)
>>>>
>>>> --
>>>> Erika Nyhus, Ph.D.
>>>> Department of Psychology and Program in Neuroscience
>>>> 6900 College Station
>>>> Bowdoin College
>>>> Brunswick, ME 04011
>>>>
>>>>
>>>
>>>
>>> --
>>> Makoto Miyakoshi
>>> Swartz Center for Computational Neuroscience
>>> Institute for Neural Computation, University of California San Diego
>>>
>>
>>
>>
>> --
>> Erika Nyhus, Ph.D.
>> Department of Psychology and Program in Neuroscience
>> 6900 College Station
>> Bowdoin College
>> Brunswick, ME 04011
>>
>>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>



-- 
Erika Nyhus, Ph.D.
Department of Psychology and Program in Neuroscience
6900 College Station
Bowdoin College
Brunswick, ME 04011
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20180103/17d733ed/attachment.html>