MATLAB: How to convert co-ordinates of a plot as a single vector

Question

I have two vectors that contain a series of nos with a lot of repetitions ranging from 1:100 and from 1:83. but they are of the same length (1×1685)

I want to obtain the co-ordinates as a single vector with length of 83 ranging between the value 1:100 basically i can plot my data as

plot(a(1:1685),b(1:1685));

But I need to get the area under the curve of this plot – its a graph with xlimit 83 and ylimit 100 with 1685 data points

Answer 1

To get the area-under-the-curve, use the trapz or cumtrapz function.

AUC_Total = trapz(a(1:1685),b(1:1685));
AUC_Stepwise = cumtrapz(a(1:1685),b(1:1685));

Note that:

AUC_Total = AUC_Stepwise(end);