How to call a user-defined function within a parfor loop

I have searched the Matlab answers forum and cannot find an answer to my problem. The function EWT_Meyer_FilterBank is not getting passed to the workers. Even when I try to use addAttachedfiles(), I continue to get the error -->

{An UndefinedFunction error was thrown on the workers for

'EWT_Meyer_FilterBank'. This might be because the file containing

'EWT_Meyer_FilterBank' is not accessible on the workers. Use

addAttachedFiles(pool, files) to specify the required files to be attached.

Caused by:

Undefined function 'EWT_Meyer_FilterBank' for input arguments of type

'double'.

MUSICdata = load ('MUSICboundaries.mat');
EMGdata = load ('parsedcell.mat');

parsed = EMGdata.parsed;
musicbs = MUSICdata.musicbs;
ewt_pInf = cell(40,23,6,12);

parfor s = 1:40
    myPool = gcp;
    addAttachedFiles(myPool,{'EWT_Meyer_FilterBank.m', 'EWT_Meyer_Scaling.m','EWT_Meyer_Wavelet.m'});
    for m = 1:23
        for tr = 1:6
            bound = cell2mat(musicbs(s,m,tr));
            sig = cell2mat(parsed(s,m,tr));
            for ch = 1:12
                
                f = sig(:,ch);
                
                % We extend the signal by miroring to deal with the boundaries
                l=round(length(f)/2);
                f2=[f(l-1:-1:1);f;f(end:-1:end-l+1)];
                ff=fft(f2);
                boundaries = bound(ch,:);
                
                % We build the corresponding filter bank
                mfb=EWT_Meyer_FilterBank(boundaries,length(ff));
                
                % We filter the signal to extract each subband
                ewt=cell(length(mfb),1);
                for k=1:length(mfb)
                    ewt{k}=real(ifft(conj(mfb{k}).*ff));
                    ewt{k}=ewt{k}(l:end-l);
                end
                ewtM = cell2mat(ewt);
                ewt_pInf(s,m,tr,ch) = {ewt};
            end
        end
    end
end

Answer 1

[Edric Ellis]

You should call addAttachedFiles outside the parfor loop.