finding maximum and minimum values

Hello I wish to find the maximum and minimum values for a tidal data.

I want to find the maximum and minimum values for each tidal cycles.

I use matlab to read these values from a excel file, As shown from picture above,

I want to find the maximum value for two peaks, and two bottoms along with the location of the values.

Any suggestions? Many Thanks

Answer 1

[KSSV]

Read about findpeaks ..also you can use max min .

[sheng deng]

Thanks for the heads up, it works fine now.