How to calculate peak voltages of a waveform.?

I have an EEG potential waveform, which has multiple peaks (Positive and negative). I'm using the findpeaks function to find the peak's .But it doesn't calculate the peak's voltage / y-axis value. It calculates the x-axis value.

Any idea how i can do that.?

This is how i am calculating the peaks:

[~,locs_P1P3] = findpeaks(EEGEpochMean,'MinPeakHeight',0.5, 'MinPeakDistance',100);

[~,locs_N] = findpeaks(EEGEpochMeanInv,'MinPeakHeight',0.5, 'MinPeakDistance',100);

Answer 1

[Ameer Hamza]

First output argument gives the peak value, you have masked it with '~'

[peak_values,locs_P1P3] = findpeaks(EEGEpochMean,'MinPeakHeight',0.5, 'MinPeakDistance',100);