I'm plotting ECG data and I want to resale the x and y axis so that only the first 3 seconds are showing

I am a complete beginner so go easy on me :)

load('ecg_wavs.mat') t = linspace(1,3,length(ecg50hz)); subplot(2,1,1); plot(t, ecg50hz), grid on; title('ECG 50Hz'); subplot(2,1,2); plot(t, ecg_emg), grid on; title('ECG EMG');

Answer 1

[Star Strider]

First, you need to know the sampling frequency of your EKG record. You can either have that stated in the metadata of the record, or from the time vector. If you have the sampling frequency (here ‘Fs’) you can calculate the time vector as:

t = linspace(0, 1, length(ecg50hz))/Fs;

then after your plot call, add:

set(gca, 'XLim',[0  3])

If my assumptions are correct, that will give you the result you want.

NOTE — Since I don’t have your data, this is UNTESTED CODE. It should work.