MATLAB: Help needed with finding an average delta value in the dataset

Question

Hello,

I have a 1×200 array called "Datapoints". What I am wanting to do is take the 10 highest points and the 10 lowest points and subtract them from each other so I can get an array of 10 delta values. I know I can utilize the "diff" function for this.

I am using findpeaks(Datapoints) to get the peaks in the dataset, however when taking the negative of the dataset to find the troughs (findpeaks(-Datapoints)), it is not finding the lowest points.

Is there an easier way to do this? Please help.

Answer 1

I'd just use sort for this purpose

data1 = sort(data);
highest = data(end-9:end));
lowest = data(1:10);