%?This?programm?reads?ECG?data?which?are?saved?in?format?212.
%?（e.g.?100.dat?from?MIT-BIH-DB?cu01.dat?from?CU-DB...）
%?The?data?are?displayed?in?a?figure?together?with?the?annotations.
%?The?annotations?are?saved?in?the?vector?ANNOT?the?corresponding
%?times?（in?seconds）?are?saved?in?the?vector?ATRTIME.
%?The?annotations?are?saved?as?numbers?the?meaning?of?the?numbers?can
%?be?found?in?the?codetable?“ecgcodes.h“?available?at?www.physionet.org.
%
%?ANNOT?only?contains?the?most?important?information?which?is?displayed
%?with?the?program?rdann?（available?on?www.physionet.org）?in?the?3rd?row.
%?The?4th?to?6th?row?are?not?saved?in?ANNOT.
%
%
%??????created?on?Feb.?27?2003?by
%??????Robert?Tratnig?（Vorarlberg?University?of?Applied?Sciences）
%??????（email:?rtratnig@gmx.at）
%
%??????algorithm?is?based?on?a?program?written?by
%??????Klaus?Rheinberger?（University?of?Innsbruck）
%??????（email:?klaus.rheinberger@uibk.ac.at）
%
%?-------------------------------------------------------------------------
function?[signalh]=load_data（FILE_NO）


%------?SPECIFY?DATA?------------------------------------------------------
PATH=?‘D:\aa_work\新學(xué)期項目及論文\心電圖項目\數(shù)據(jù)集\MIT-BIH?Arrhythmia?Database\test‘;?%?path?where?data?are?saved

HEADERFILE=strcat（?FILE_NO‘.hea‘）;??????%?header-file?in?text?format
ATRFILE=strcat（?FILE_NO?‘.atr‘）;?????????%?attributes-file?in?binary?format
DATAFILE=strcat（?FILE_NO‘.dat‘）;?????????%?data-file
SAMPLES2READ=648000;?????????%?number?of?samples?to?be?read
????????????????????????????%?in?case?of?more?than?one?signal:
????????????????????????????%?2*SAMPLES2READ?samples?are?read

%------?LOAD?HEADER?DATA?--------------------------------------------------
fprintf（1‘\\n$>?WORKING?ON?%s?...\n‘?HEADERFILE）;
signalh=?fullfile（PATH?HEADERFILE）;
fid1=fopen（signalh‘r‘）;
z=?fgetl（fid1）;
A=?sscanf（z?‘%*s?%d?%d?%d‘[13]）;
nosig=?A（1）;??%?number?of?signals
sfreq=A（2）;???%?sample?rate?of?data
clear?A;
for?k=1:nosig
????z=?fgetl（fid1）;
????A=?sscanf（z?‘%*s?%d?%d?%d?%d?%d‘[15]）;
????dformat（k）=?A（1）;???????????%?format;?here?only?212?is?allowed
????gain（k）=?A（2）;??????????????%?number?of?integers?per?mV
????bitres（k）=?A（3）;????????????%?bitresolution
????zerovalue（k）=?A（4）;?????????%?integer?value?of?ECG?zero?point
????firstvalue（k）=?A（5）;????????%?first?integer?value?of?signal?（to?test?for?errors）
end;
fclose（fid1）;
clear?A;

%------?LOAD?BINARY?DATA?--------------------------------------------------
if?dformat~=?[212212]?error（‘this?script?does?not?apply?binary?formats?different?to?212.‘）;?end;
signald=?fullfile（PATH?DATAFILE）;????????????%?data?in?format?212
fid2=fopen（signald‘r‘）;
A=?fread（fid2?[3?SAMPLES2READ]?‘uint8‘）‘;??%?matrix?with?3?rows?each?8?bits?long?=?2*12bit
fclose（fid2）;
M2H=?bitshift（A（:2）?-4）;
M1H=?bitand