MATLAB: Ecg signal in matlab

ecg

I have downloaded an ecg signal from MIH physionet org, and it has .dat format. I loaded into matlab using the following code:

x1= load ('16265.dat');

However, I'm getting this error:

Error using load Unknown text on line number 1 of ASCII file C:\Users\student\.wfdb-swig-matlab\16265.dat "ÿ".

Any thoughts ?

Thanks in advance

Those are not simply ascii files you can use load() with. They are binary files.

Please read the following to learn how to read them in MATLAB

http://www.physionet.org/physiotools/matlab/wfdb-swig-matlab/

doc fft %the documentation example is very good

Very simple example how to add noise to a wave:

t=0:0.1:10; %from 0 to 10 seconds, sampling 0.1 seconds
y=sin(t); %measured amplitude
n=0.1*rand(1,numel(t)); %noise to add
plot(x,y+n)