sir i have been doing a project on effect of playing video games on heart.I have obtained the ecg signal & have done the filtering.now i need a code to find out the number of R-R peaks.Can you help me?

wo = 50/(250/2);  bw = wo/35;
[b,a] = iirnotch(wo,bw);fvtool(b,a);
y=filter(b,a,x1);
z=sgolayfilt(y,0,7);
subplot(2,1,1)
 plot([1:1000],x1(1:1000));axis([0 1000 -.5 2]);title('ecg');grid;
 subplot(2,1,2)
 plot([1:1000],z(1:1000));axis([0 1000 -.5 2]);title('filtered');grid;
yy = smooth(z,1,'moving');
k = smooth(z,239,'moving');
ans=yy-k;
plot([1:1000],ans(1:1000));axis([0 1000 -.5 2]);title('baseline removed');grid;

[Jan]

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Answer 1

[Image Analyst]

What about findpeaks() in the Signal Processing Toolbox? Or try this: http://billauer.co.il/peakdet.html