How can I select multiple data points on a curve for calculating slope of each points?

Dear all,

I have sensor data shared as schmatically below. I want to calculate slope of each determined points for feature extraction. The problem will be getting complicated later on but now I think it should be enough to know how to select points and calculate slope of that with some commands (not using 'ginput') .

Does anyone have any idea?

Thanks,

Answer 1

[KSSV]

The points which you have shown are peak points. To get the peak points you can use findpeaks. This will give you indices and values. From the indices, you can get the next point by either incresing the index by some constant value, you add this to index and get the next value. Once you know two points, you can fit a line using polyfit. This will give you slope and y-intercept.

[Erdem Sennik]

Thank you for your respond.

I am actually really new for Matlab and I can describe what I should do for the situation. However, I am stuck when describing that with commands.

Do you have some commands to share with me?

[KSSV]

I gave commands/ functions already right. Read about findpeaks, polyfit.

[Erdem Sennik]

I am going to check that, thanks!