I have a ecg signal, want to plot the signal between the range 20-30 samples. How can I plot? below is my given code of the given signal

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Neal
Neal 2017-3-28
评论： Star Strider 2017-3-28
D = load('16265m.mat');
x1 = D.val;
t = linspace(0,60, size(x1,2));
subplot(2,1,1)
plot(t,x1)
axis tight
xlabel('Samples')
ylabel('Amplitudes')
title('Raw ECG signal')
[z, a]=butter(5,0.5,'low');
x=filter(z,a,x1);
N = length(x1);
t = linspace(0,60, size(x,2))
subplot(2,1,2)
plot(t,x)
axis tight
xlabel('Samples')
ylabel('Amplitudes')
title('Filtered ECG signal')
  1 个评论
Star Strider
Star Strider 2017-3-28
What do you mean by ‘between the range 20-30 samples’ ?
Note that you need to define your sampling frequency in order to correctly calculate your time vector, using the sampling interval. (It is provided for the PhysioBank data for each record.)

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