How to plot horizontal line with waveform like the green line in the photo

How i plot like the green line in the photo

Answer 1

[Mathieu NOE]

hi

looks like this would be the RMS value of the signal; so you simply have to calculate that rms value and plot it with the same length as your x vector

[john m]

No it is not the RMS it is just a value. And how i plot in the same figure of the wave ? Can you write the code pl?

[Mathieu NOE]

something like

plot(xData,yData,'b',xData,my_value*ones(length(xData)),'g')