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

chao wang hnchaowang at gmail.com
Wed Apr 5 18:14:51 PDT 2017


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> wrote:
>
>
> ---------- Forwarded message ----------
> From: "Morett, Laura" <laura.morett at yale.edu>
> To: "eeglablist at sccn.ucsd.edu" <eeglablist at sccn.ucsd.edu>
> Cc:
> Bcc:
> 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
>
> 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=>
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