MATLAB: Error in opening MIT ecg database

ecg mit .dat

hello,
I want read and plot ECG signal downloaded from MIT data base (.dat) i use the following codes:
clear all
clc
close all
[filename, pathname] = uigetfile('*.dat', 'Open file .dat');% only image Bitmap
if isequal(filename, 0) || isequal(pathname, 0)   
    disp('File input canceled.');  
   ECG_Data = [];  
else
fid=fopen(filename,'r')
end;
time=10;
f=fread(fid)
Orig_Sig=f(1:length(f));
%plot(Orig_Sig(1:2:length(f)))
plot(Orig_Sig(1:2:4000))
i get the following error:
Error using fread Invalid file identifier. Use fopen to generate a valid file identifier.
how i can read these data?
thank in advance

Best Answer

fd = fopen( fullfile(pathname, filename), 'r')
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