How to calculate peak in MATLAB

I am using peak for the feature extraction as a statistical parameter Which formula is correct to get the peak

1- Peak = (max (x) - min (x))

2- peak = 1/2 (max (x) - min(X))

where x is the data that needs to be calculated

I found some sources (literature) indicates the first one, and some indicates the second with peak-peak.

I am confused, which one should I use??!

Answer 1

[Abhishek Ballaney]

https://in.mathworks.com/help/signal/ref/findpeaks.html

Answer 2

[Tubi]

As it is known

Peak = max (x)

peak-peak= max (x)- min (x)

And Crest Factor= Peak/RMS

But, can we also consider Crest Factor= Peak-Peak/RMS??!