心电信号是从MIT-BIH中下载的离线信号，已找到可以读出并显示该信号的程序如下所示，现在想通过GUI中的pushbutton打开该信号并显示在Axes1上，求大神指教啊。

clc; clear all;

%------ SPECIFY DATA ------------------------------------------------------

PATH= 'F:\ecg\程序'; % path, where data are saved

HEADERFILE= '100.hea';      % header-file in text format

ATRFILE= '100.atr';         % attributes-file in binary format

DATAFILE='100.dat';         % data-file

SAMPLES2READ=30000;         % 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',[1,3]);

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',[1,5]);

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~= [212,212], 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(A(:,2), 15);

PRL=bitshift(bitand(A(:,2),8),9);     % sign-bit

PRR=bitshift(bitand(A(:,2),128),5);   % sign-bit

M( : , 1)= bitshift(M1H,8)+ A(:,1)-PRL;

M( : , 2)= bitshift(M2H,8)+ A(:,3)-PRR;

if M(1,:) ~= firstvalue, error('inconsistency in the first bit values'); end;

switch nosig

case 2

M( : , 1)= (M( : , 1)- zerovalue(1))/gain(1);

M( : , 2)= (M( : , 2)- zerovalue(2))/gain(2);

TIME=(0:(SAMPLES2READ-1))/sfreq;

case 1

M( : , 1)= (M( : , 1)- zerovalue(1));

M( : , 2)= (M( : , 2)- zerovalue(1));

M=M';

M(1)=[];

sM=size(M);

sM=sM(2)+1;

M(sM)=0;

M=M';

M=M/gain(1);

TIME=(0:2*(SAMPLES2READ)-1)/sfreq;

otherwise  % this case did not appear up to now!

% here M has to be sorted!!!

disp('Sorting algorithm for more than 2 signals not programmed yet!');

end;

clear A M1H M2H PRR PRL;

fprintf(1,'\\n$> LOADING DATA FINISHED \n');

%------ LOAD ATTRIBUTES DATA ----------------------------------------------

atrd= fullfile(PATH, ATRFILE);      % attribute file with annotation data

fid3=fopen(atrd,'r');

A= fread(fid3, [2, inf], 'uint8')';

fclose(fid3);

ATRTIME=[];

ANNOT=[];

sa=size(A);

saa=sa(1);

i=1;

while i<=saa

annoth=bitshift(A(i,2),-2);

if annoth==59

ANNOT=[ANNOT;bitshift(A(i+3,2),-2)];

ATRTIME=[ATRTIME;A(i+2,1)+bitshift(A(i+2,2),8)+...

bitshift(A(i+1,1),16)+bitshift(A(i+1,2),24)];

i=i+3;

elseif annoth==60

% nothing to do!

elseif annoth==61

% nothing to do!

elseif annoth==62

% nothing to do!

elseif annoth==63

hilfe=bitshift(bitand(A(i,2),3),8)+A(i,1);

hilfe=hilfe+mod(hilfe,2);

i=i+hilfe/2;

else

ATRTIME=[ATRTIME;bitshift(bitand(A(i,2),3),8)+A(i,1)];

ANNOT=[ANNOT;bitshift(A(i,2),-2)];

end;

i=i+1;

end;

ANNOT(length(ANNOT))=[];       % last line = EOF (=0)

ATRTIME(length(ATRTIME))=[];   % last line = EOF

clear A;

ATRTIME= (cumsum(ATRTIME))/sfreq;

ind= find(ATRTIME <= TIME(end));

ATRTIMED= ATRTIME(ind);

ANNOT=round(ANNOT);

ANNOTD= ANNOT(ind);

%------ DISPLAY DATA ------------------------------------------------------

figure(1); clf, box on, hold on

plot(TIME, M(:,1),'r');

if nosig==2

plot(TIME, M(:,2),'b');

end;

for k=1:length(ATRTIMED)

text(ATRTIMED(k),0,num2str(ANNOTD(k)));

end;

xlim([TIME(1), TIME(end)]);

xlabel('Time / s'); ylabel('Voltage / mV');

string=['ECG signal ',DATAFILE];

title(string);

fprintf(1,'\\n$> DISPLAYING DATA FINISHED \n');

% -------------------------------------------------------------------------

fprintf(1,'\\n$> ALL FINISHED \n');