Trying to make the baseline of my data follow a sine curve.

So Im trying to take a pre-recorded ECG data set and make the baseline follow a sine curve to mimic baseline wandering. I have tried fit(), the curve fitting tool box, polyfit(), but its not working.

Anyone got any ideas on how I can go about this or where I can find ECG data that is experiencing baseline wandering?

Answer 1

[Cris LaPierre]

If you want to introduce baseline wandering, how are you hoping to use fit or polyfit? Why not just add the sin wave to your ecg signal?

ecg=readmatrix("ReducedRawECG.txt");
plot(ecg)

r = linspace(0,pi,length(ecg))';
w = sin(r);
hold on
plot(w)
plot(w+ecg)
hold off

[Brandon Steinlein]

I knew I was overthinking it. Thank you!