How do i read an edf file in MatLab?

I am a med student and I was given this syntax by my superior to use to read an edf file. I dont know what "filename" is or "savename". Can anyone help me???? I saved the edf file as filez.edf

    %EDFREAD reads EEG data from the EDF data format
    %
    %   Usage:
    %   [data, HDR] = edfread(filename, savename)
    %
    %   Input:
    %   filename: string with name of .edf file to be read
    %   savename: string to use as name of saved .mat file with data
    %
    %   Output:
    %   data: EEG data in format <channels> X <time>, for SEDline, the third
    %   channel is the FpZ reference electrode
    %   HDR: structure containing information from header of .edf file
    %
    %   Example:
    %
    %   See also edfrepair, sopen, sread
    %
    %   Copyright 2011
    %
    %   Last modified 08/26/2011
    %********************************************************************

    function [data, HDR] = edfread(filename, savename)

    %Add sopen function if not in header
    if isempty(which('sopen'))
    %         addpath(genpath('/autofs/cluster/purdonlab/code/matlab_packages/eeglab10.2.2.4b'));
        addpath(genpath('/autofs/cluster/purdonlab/code/matlab_packages/eeglab10.2.2.4b/external/biosig-partial/'));
    end

    % Get header information from EDF, repairing header if necessary
    try
        HDR=sopen(filename,'r',1,'OVERFLOWDETECTION:OFF');
        sclose(HDR);

        if isfield(HDR,'Label');
            chanvars.labels_all=lower(HDR.Label);
        end
    catch ME
        edfdata = fread(fopen(filename));

        for i=1:256*6
            if edfdata(i)==0;
                edfdata(i)=32;
            end
        end

        edfdata(89:97)=[83; 116; 97; 114; 116; 100; 97; 116; 101];

        fwrite(fopen([filename(1:end-4) '_repaired.edf'], 'w'), edfdata);
        filename=[filename(1:end-4) '_repaired.edf'];

        HDR=sopen(filename,'r',1,'OVERFLOWDETECTION:OFF');
        sclose(HDR);
        if isfield(HDR,'Label');
            chanvars.labels_all=lower(HDR.Label);
        end
    end

    % Get data channels
    chanvars.labels={};
    for i=1:length(chanvars.labels_all)
        chanvars.labels(end+1)=chanvars.labels_all(i);
        disp(['Extracting channel ' num2str(length(chanvars.labels)) ' of '...
            num2str(size(chanvars.labels_all,1)) '.']);
        HDR=sopen(filename,'r',i,'OVERFLOWDETECTION:OFF');
        [S,HDR]=sread(HDR);
        S=S(:)';
        data(i,:) = S;
        sclose(HDR);
    end

    Fs = HDR.SampleRate;
    t=[(1/Fs):(1/Fs):(size(data,2)/Fs)];

    if nargin==2
        % Save data  and header structure to .mat file
        save(strcat(savename,'.mat'), 'data', 't', 'Fs', 'HDR','-v7.3');
    end

[sreeja narahari]

We are not able to read the .edf file

[Walter Roberson]

There is no sub.edf in the directory. There is a fname.edf file.

Answer 1

[Walter Roberson]

It says right in the comments:

    %   Input:
    %   filename: string with name of .edf file to be read
    %   savename: string to use as name of saved .mat file with data

An example would be

[data, HDR] = edfread('/autofs/cluster/purdonlab/data/emitchell/project83b/seq20150229brap.edf', './seq20150229brap.mat');

[Shravan Sivakumar]

i just can't seem to open any edf files using this command. I get this "Undefined function or variable 'edfread'.

" on the command window

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/31900-edfread

Answer 2

[Sal]

Hey guys, newbie at matlab here.

I have an edf file with eeg data (~500mb). I need to load the eeg data in a matrix of 'timepoint x eeg channels'. How do I do that?

I have tried the

[hdr, record] = edfread(fname)

but that just gives me a massive file which I assume is more information than I need.

Thanks in advance!