I'm a newbie and I have a few questions regarding ECG signal. Here is my plot of raw ECG signal with a sampling frequency 200Hz in Matlab.
Does it look good to you? Why is it flipped?
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It's perfectly normal for the peaks to be at the bottom if that's what you're referring to. Even though on tv they are always on the top.
Here's an example from wikipedia. https://commons.wikimedia.org/wiki/File:Pulmonary_embolism_ECG.jpg