--- a
+++ b/edfread.m
@@ -0,0 +1,264 @@
+
+function [hdr, record] = edfread(fname, varargin)
+% Read European Data Format file into MATLAB
+%
+% [hdr, record] = edfread(fname)
+%         Reads data from ALL RECORDS of file fname ('*.edf'). Header
+%         information is returned in structure hdr, and the signals
+%         (waveforms) are returned in structure record, with waveforms
+%         associated with the records returned as fields titled 'data' of
+%         structure record.
+%
+% [...] = edfread(fname, 'assignToVariables', assignToVariables)
+%         If assignToVariables is true, triggers writing of individual
+%         output variables, as defined by field 'labels', into the caller
+%         workspace.
+%
+% [...] = edfread(...,'targetSignals',targetSignals)
+%         Allows user to specify the names (or position numbers) of the
+%         subset of signals to be read. |targetSignals| may be either a
+%         string, a cell array of comma-separated strings, or a vector of
+%         numbers. (Default behavior is to read all signals.)
+%         E.g.:
+%         data = edfread(mydata.edf,'targetSignals','Thoracic');
+%         data = edfread(mydata.edf,'targetSignals',{'Thoracic1','Abdominal'});
+%         or
+%         data = edfread(mydata.edf,'targetSignals',[2,4,6:13]);
+%
+% FORMAT SPEC: Source: http://www.edfplus.info/specs/edf.html SEE ALSO:
+% http://www.dpmi.tu-graz.ac.at/~schloegl/matlab/eeg/edf_spec.htm
+%
+% The first 256 bytes of the header record specify the version number of
+% this format, local patient and recording identification, time information
+% about the recording, the number of data records and finally the number of
+% signals (ns) in each data record. Then for each signal another 256 bytes
+% follow in the header record, each specifying the type of signal (e.g.
+% EEG, body temperature, etc.), amplitude calibration and the number of
+% samples in each data record (from which the sampling frequency can be
+% derived since the duration of a data record is also known). In this way,
+% the format allows for different gains and sampling frequencies for each
+% signal. The header record contains 256 + (ns * 256) bytes.
+%
+% Following the header record, each of the subsequent data records contains
+% 'duration' seconds of 'ns' signals, with each signal being represented by
+% the specified (in the header) number of samples. In order to reduce data
+% size and adapt to commonly used software for acquisition, processing and
+% graphical display of polygraphic signals, each sample value is
+% represented as a 2-byte integer in 2's complement format. Figure 1 shows
+% the detailed format of each data record.
+%
+% DATA SOURCE: Signals of various types (including the sample signal used
+% below) are available from PHYSIONET: http://www.physionet.org/
+%
+%
+% % EXAMPLE 1:
+% % Read all waveforms/data associated with file 'ecgca998.edf':
+%
+% [header, recorddata] = edfread('ecgca998.edf');
+%
+% % EXAMPLE 2:
+% % Read records 3 and 5, associated with file 'ecgca998.edf':
+%
+% % E
+% header = edfread('ecgca998.edf','AssignToVariables',true);
+% % Header file specifies data labels 'label_1'...'label_n'; these are
+% % created as variables in the caller workspace.
+%
+% Coded 8/27/09 by Brett Shoelson, PhD
+% brett.shoelson@mathworks.com
+% Copyright 2009 - 2012 MathWorks, Inc.
+%
+% Modifications:
+% 5/6/13 Fixed a problem with a poorly subscripted variable. (Under certain
+% conditions, data were being improperly written to the 'records' variable.
+% Thanks to Hisham El Moaqet for reporting the problem and for sharing a
+% file that helped me track it down.)
+% 
+% 5/22/13 Enabled import of a user-selected subset of signals. Thanks to
+% Farid and Cindy for pointing out the deficiency. Also fixed the import of
+% signals that had "bad" characters (spaces, etc) in their names.
+%
+% 10/30/14 Now outputs frequency field directly, and (thanks to Olga Imas
+% for the suggestion.)
+%
+% 3/23/2015 Fixed a doc problem with an improperly named variable
+% (desiredSignals->targetSignals).
+% HEADER RECORD
+% 8 ascii : version of this data format (0)
+% 80 ascii : local patient identification
+% 80 ascii : local recording identification
+% 8 ascii : startdate of recording (dd.mm.yy)
+% 8 ascii : starttime of recording (hh.mm.ss)
+% 8 ascii : number of bytes in header record
+% 44 ascii : reserved
+% 8 ascii : number of data records (-1 if unknown)
+% 8 ascii : duration of a data record, in seconds
+% 4 ascii : number of signals (ns) in data record
+% ns * 16 ascii : ns * label (e.g. EEG FpzCz or Body temp)
+% ns * 80 ascii : ns * transducer type (e.g. AgAgCl electrode)
+% ns * 8 ascii : ns * physical dimension (e.g. uV or degreeC)
+% ns * 8 ascii : ns * physical minimum (e.g. -500 or 34)
+% ns * 8 ascii : ns * physical maximum (e.g. 500 or 40)
+% ns * 8 ascii : ns * digital minimum (e.g. -2048)
+% ns * 8 ascii : ns * digital maximum (e.g. 2047)
+% ns * 80 ascii : ns * prefiltering (e.g. HP:0.1Hz LP:75Hz)
+% ns * 8 ascii : ns * nr of samples in each data record
+% ns * 32 ascii : ns * reserved
+% DATA RECORD
+% nr of samples[1] * integer : first signal in the data record
+% nr of samples[2] * integer : second signal
+% ..
+% ..
+% nr of samples[ns] * integer : last signal
+if nargin > 5
+    error('EDFREAD: Too many input arguments.');
+end
+if ~nargin
+    error('EDFREAD: Requires at least one input argument (filename to read).');
+end
+[fid,msg] = fopen(fname,'r');
+if fid == -1
+    error(msg)
+end
+assignToVariables = false; %Default
+targetSignals = []; %Default
+for ii = 1:2:numel(varargin)
+    switch lower(varargin{ii})
+        case 'assigntovariables'
+            assignToVariables = varargin{ii+1};
+        case 'targetsignals'
+            targetSignals = varargin{ii+1};
+        otherwise
+            error('EDFREAD: Unrecognized parameter-value pair specified. Valid values are ''assignToVariables'' and ''targetSignals''.')
+    end
+end
+% HEADER
+hdr.ver        = str2double(char(fread(fid,8)'));
+hdr.patientID  = fread(fid,80,'*char')';
+hdr.recordID   = fread(fid,80,'*char')';
+hdr.startdate  = fread(fid,8,'*char')';% (dd.mm.yy)
+% hdr.startdate  = datestr(datenum(fread(fid,8,'*char')','dd.mm.yy'), 29); %'yyyy-mm-dd' (ISO 8601)
+hdr.starttime  = fread(fid,8,'*char')';% (hh.mm.ss)
+% hdr.starttime  = datestr(datenum(fread(fid,8,'*char')','hh.mm.ss'), 13); %'HH:MM:SS' (ISO 8601)
+hdr.bytes      = str2double(fread(fid,8,'*char')');
+reserved       = fread(fid,44);%#ok
+hdr.records    = str2double(fread(fid,8,'*char')');
+if hdr.records == -1
+	beep
+	disp('There appears to be a problem with this file; it returns an out-of-spec value of -1 for ''numberOfRecords.''')
+	disp('Attempting to read the file with ''edfReadUntilDone'' instead....');
+	[hdr, record] = edfreadUntilDone(fname, varargin);
+	return
+end
+hdr.duration   = str2double(fread(fid,8,'*char')');
+% Number of signals
+hdr.ns    = str2double(fread(fid,4,'*char')');
+for ii = 1:hdr.ns
+    hdr.label{ii} = regexprep(fread(fid,16,'*char')','\W','');
+end
+if isempty(targetSignals)
+    targetSignals = 1:numel(hdr.label);
+elseif iscell(targetSignals)||ischar(targetSignals)
+    targetSignals = find(ismember(hdr.label,regexprep(targetSignals,'\W','')));
+end
+if isempty(targetSignals)
+    error('EDFREAD: The signal(s) you requested were not detected.')
+end
+for ii = 1:hdr.ns
+    hdr.transducer{ii} = fread(fid,80,'*char')';
+end
+% Physical dimension
+for ii = 1:hdr.ns
+    hdr.units{ii} = fread(fid,8,'*char')';
+end
+% Physical minimum
+for ii = 1:hdr.ns
+    hdr.physicalMin(ii) = str2double(fread(fid,8,'*char')');
+end
+% Physical maximum
+for ii = 1:hdr.ns
+    hdr.physicalMax(ii) = str2double(fread(fid,8,'*char')');
+end
+% Digital minimum
+for ii = 1:hdr.ns
+    hdr.digitalMin(ii) = str2double(fread(fid,8,'*char')');
+end
+% Digital maximum
+for ii = 1:hdr.ns
+    hdr.digitalMax(ii) = str2double(fread(fid,8,'*char')');
+end
+for ii = 1:hdr.ns
+    hdr.prefilter{ii} = fread(fid,80,'*char')';
+end
+for ii = 1:hdr.ns
+    hdr.samples(ii) = str2double(fread(fid,8,'*char')');
+end
+for ii = 1:hdr.ns
+    reserved    = fread(fid,32,'*char')';%#ok
+end
+hdr.label = hdr.label(targetSignals);
+hdr.label = regexprep(hdr.label,'\W','');
+hdr.units = regexprep(hdr.units,'\W','');
+hdr.frequency = hdr.samples./hdr.duration;
+disp('Step 1 of 2: Reading requested records. (This may take a few minutes.)...');
+if nargout > 1 || assignToVariables
+    % Scale data (linear scaling)
+    scalefac = (hdr.physicalMax - hdr.physicalMin)./(hdr.digitalMax - hdr.digitalMin);
+    dc = hdr.physicalMax - scalefac .* hdr.digitalMax;
+    
+    % RECORD DATA REQUESTED
+    tmpdata = struct;
+    for recnum = 1:hdr.records
+        for ii = 1:hdr.ns
+            % Read or skip the appropriate number of data points
+            if ismember(ii,targetSignals)
+                % Use a cell array for DATA because number of samples may vary
+                % from sample to sample
+                tmpdata(recnum).data{ii} = fread(fid,hdr.samples(ii),'int16') * scalefac(ii) + dc(ii);
+            else
+                fseek(fid,hdr.samples(ii)*2,0);
+            end
+        end
+    end
+    hdr.units = hdr.units(targetSignals);
+    hdr.physicalMin = hdr.physicalMin(targetSignals);
+    hdr.physicalMax = hdr.physicalMax(targetSignals);
+    hdr.digitalMin = hdr.digitalMin(targetSignals);
+    hdr.digitalMax = hdr.digitalMax(targetSignals);
+    hdr.prefilter = hdr.prefilter(targetSignals);
+    hdr.transducer = hdr.transducer(targetSignals);
+    
+    record = zeros(numel(hdr.label), hdr.samples(1)*hdr.records);
+    % NOTE: 5/6/13 Modified for loop below to change instances of hdr.samples to
+    % hdr.samples(ii). I think this underscored a problem with the reader.
+    
+    % Sort by requested targetSignals order:
+    
+    disp('Step 2 of 2: Parsing data...');
+    recnum = 1;
+    for ii = 1:hdr.ns
+        if ismember(ii,targetSignals)
+            ctr = 1;
+            for jj = 1:hdr.records
+                try %#ok
+                    record(recnum, ctr : ctr + hdr.samples(ii) - 1) = tmpdata(jj).data{ii};
+                end
+                ctr = ctr + hdr.samples(ii);
+            end
+            recnum = recnum + 1;
+        end
+    end
+    hdr.ns = numel(hdr.label);
+    hdr.samples = hdr.samples(targetSignals);
+    if assignToVariables
+        for ii = 1:numel(hdr.label)
+            try %#ok
+                eval(['assignin(''caller'',''',hdr.label{ii},''',record(ii,:))'])
+            end
+        end
+		% Uncomment this line to duplicate output in a single matrix
+		% ''record''. (Could be memory intensive if dataset is large.)
+		record = [];% No need to output record data as a matrix?
+    end
+end
+fclose(fid);