[Eeglablist] Passing vector elements to pop_select() 'no channel' argument

Thu Apr 6 07:26:33 PDT 2017

Hi Chao,
Thanks once again for your response.  I removed the pop_select() function from my code, and interpolation now seems to be working as it should.

Best wishes,
Laura

********************************************************
Laura M. Morett
Hilibrand Postdoctoral Fellow
Yale Child Study Center
230 S. Frontage Rd.
New Haven, CT 06520

As of August 16, 2017:
Assistant Professor of Educational Psychology
Educational Neuroscience Initiative
University of Alabama
Box 870231
Tuscaloosa, AL 35487-0231

Email: laura.morett at yale.edu<mailto:laura.morett at yale.edu>
Phone: (203) 737-4586
Web: http://lauramorett.strikingly.com/<https://urldefense.proofpoint.com/v2/url?u=http-3A__lauramorett.strikingly.com_&d=CwMF-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=7RydtjFxlOLitiTKeuyufwjZVnuS2cr0LD3ZBHQd6QA&m=hcKHc9qk081CzOBRcCJRuXs-41-8mLMuX9gmiw_QG_g&s=UQlF7t1IaNyCaJW5l4lvUXFZvEYnMtD2_GIYvnLLIaE&e=>

From: chao wang <hnchaowang at gmail.com>
Date: Wednesday, April 5, 2017 at 11:36 PM
To: "Morett, Laura" <laura.morett at yale.edu>
Cc: EEGLAB List <eeglablist at sccn.ucsd.edu>
Subject: Re: Passing vector elements to pop_select() 'no channel' argument

Hi Laura,

Just a guess. You want to replace some bad channel by interpolating it. If this is true, I think it's not correct to remove them prior to interpolation, or you'll interpolate another channel instead, and if the channel to remove is the last channel, it would encounter dimension errors similar to the one you showed. So, you may need to remove 'pop_select' command from your code.

Best,
Chao

Chao Wang, PhD Candidate
Institute of Biomedical Engineering
Xi'an Jiaotong University
No.28, Xianning West Road, Xi'an, P.R. China

On Thu, Apr 6, 2017 at 11:07 AM, Morett, Laura <laura.morett at yale.edu<mailto:laura.morett at yale.edu>> wrote:
Hi Chao,
Thanks for your helpful reply.  I tried both configurations, and the first one (numeric) appears to allow this portion of my script to proceed.  However, when I run it, I now receive the following error:

Removing 1 channel(s)...
Index exceeds matrix dimensions.

Error in pop_select (line 234)
         noChannelAsCell{nochanId} = EEG.chanlocs(g.nochannel(nochanId)).labels;

Error in eeg_interp (line 139)
        EEG       = pop_select(EEG, 'nochannel', badchans);

Error in pop_interp (line 156)
    EEG = eeg_interp(EEG, bad_elec, method);

Below is the next line of the script.  Any insight anyone can provide into what’s causing this new error would be greatly appreciated.

 EEG = pop_interp(EEG, chan_remove{s}, 'spherical');

Thanks,
Laura

********************************************************
Laura M. Morett
Hilibrand Postdoctoral Fellow
Yale Child Study Center
230 S. Frontage Rd.
New Haven, CT 06520

As of August 16, 2017:
Assistant Professor of Educational Psychology
Educational Neuroscience Initiative
University of Alabama
Box 870231
Tuscaloosa, AL 35487-0231

Email: laura.morett at yale.edu<mailto:laura.morett at yale.edu>
Phone: (203) 737-4586<tel:(203)%20737-4586>
Web: http://lauramorett.strikingly.com/<https://urldefense.proofpoint.com/v2/url?u=http-3A__lauramorett.strikingly.com_&d=CwMF-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=7RydtjFxlOLitiTKeuyufwjZVnuS2cr0LD3ZBHQd6QA&m=hcKHc9qk081CzOBRcCJRuXs-41-8mLMuX9gmiw_QG_g&s=UQlF7t1IaNyCaJW5l4lvUXFZvEYnMtD2_GIYvnLLIaE&e=>

From: chao wang <hnchaowang at gmail.com<mailto:hnchaowang at gmail.com>>
Date: Wednesday, April 5, 2017 at 9:14 PM
To: EEGLAB List <eeglablist at sccn.ucsd.edu<mailto:eeglablist at sccn.ucsd.edu>>
Cc: "Morett, Laura" <laura.morett at yale.edu<mailto:laura.morett at yale.edu>>
Subject: Re: Passing vector elements to pop_select() 'no channel' argument

Hi, Laura

In the help of the function, it says this parameter should be a "vector of channel indices to exclude from the new dataset. Can also be a cell array of channel names." So I think the following formats might be acceptable:

chan_remove = {128, [87, 119], 104, 104, 119, 15}; % (each cell is a vector of channel indices)

OR

chan_remove2 = {'E128', {'E87','E119'}, 'E104', 'E104', 'E119', 'E15'}; % (each cell is a cell array of channel indices)

You can try them.

Best,
Chao

On Thu, Apr 6, 2017 at 3:00 AM, <eeglablist-request at sccn.ucsd.edu<mailto:eeglablist-request at sccn.ucsd.edu>> wrote:

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From: "Morett, Laura" <laura.morett at yale.edu<mailto:laura.morett at yale.edu>>
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Date: Wed, 5 Apr 2017 13:19:01 +0000
Subject: [Eeglablist] Passing vector elements to pop_select() 'no channel' argument
Dear list,
I am writing to ask how I can pass a vector with multiple channel names for removal to pop_select().  At present, I’ve defined the following vectors with the names of the channels that I want to remove (chan_remove) and the subjects that I want to remove them from (subjs_rm_chan) near the beginning of my script:

chan_remove = {{'E128'}, [{{'E87'} {'E119'}}], {'E104'}, {'E104'}, {'E119'}, {'E15'}}
subjs_rm_chan = {'11113','11115','11135','11138','11145','11146'};

nsubjbadch = length(subjs_rm_chan); % number of subjects w/ bad channels

Further down, I attempt to remove them using the following code:

for s=1:nsubjbadch % Loop through list of subjects with bad channels
        data_path  = [home_path subjs_rm_chan{s} '/'];   % Path to the folder containing the current subject's data
        EEG = pop_loadset('filename',[subjs_rm_chan{s} '_reref_filt.set'], 'filepath', data_path);
        disp([chan_remove{s}]);
        EEG = pop_select(EEG,'nochannel', chan_remove{s});

When I run this code, I receive the following errors:
Error using cell/unique (line 85)
Input A must be a cell array of character vectors.

Error in cell/setdiff>cellsetdifflegacy (line 199)
    [a,ia] = unique(a,'legacy');

Error in cell/setdiff (line 133)
        [varargout{1:nlhs}] = cellsetdifflegacy(varargin{1:2},logical(flaginds(1)));

Error in setdiff_bc (line 20)
    [C,IA] = setdiff(A,B,varargin{:},'legacy');

Error in eeg_interp (line 137)
        goodchans = setdiff_bc(1:EEG.nbchan, badchans);

Error in pop_interp (line 156)
    EEG = eeg_interp(EEG, bad_elec, method);

I checked, and chan_remove is indeed not a cell array of character vectors, so I tried using the following alternative:

chan_remove = {[128], [[87], [119]], [104], [104], [119], [15]};

However, this doesn’t solve the problem, returning the following error when I run the code above:

Index exceeds matrix dimensions.

Error in pop_select (line 234)
         noChannelAsCell{nochanId} = EEG.chanlocs(g.nochannel(nochanId)).labels;

Error in eeg_interp (line 139)
        EEG       = pop_select(EEG, 'nochannel', badchans);

Error in pop_interp (line 156)

I’ve tried several different variations of syntax in defining chan_remove to no avail.  Does anyone know:

1.       How I can pass a vector of channel names to cycle through to be selected and removed?
2.       How I can pass multiple channel names as one element to be selected and removed (see second element)?

Thanks in advance for any help anyone can provide.

Best wishes,
Laura Morett

********************************************************
Laura M. Morett
Hilibrand Postdoctoral Fellow
Yale Child Study Center
230 S. Frontage Rd.
New Haven, CT 06520

As of August 16, 2017:
Assistant Professor of Educational Psychology
Educational Neuroscience Initiative
University of Alabama
Box 870231
Tuscaloosa, AL 35487-0231

Email: laura.morett at yale.edu<mailto:laura.morett at yale.edu>
Phone: (203) 737-4586<tel:(203)%20737-4586>
Web: http://lauramorett.strikingly.com/<https://urldefense.proofpoint.com/v2/url?u=http-3A__lauramorett.strikingly.com_&d=CwMF-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=7RydtjFxlOLitiTKeuyufwjZVnuS2cr0LD3ZBHQd6QA&m=hcKHc9qk081CzOBRcCJRuXs-41-8mLMuX9gmiw_QG_g&s=UQlF7t1IaNyCaJW5l4lvUXFZvEYnMtD2_GIYvnLLIaE&e=>

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