How to split data into different regions and then add trend line to each region

Hi,

I have a set of data and I want to split in into three different parts and then add a trendline to the first two parts to calculate the slope of each part.

[Kevin Phung]

How do you determine where do you want to split the data? Are you familiar with array indexing?

https://www.mathworks.com/help/matlab/learn_matlab/array-indexing.html

I would suggest using polyfit() to plot the trendline:

https://www.mathworks.com/help/matlab/ref/polyfit.html

[Adam Danz]

Try k-means clustering if you're trying to pares your data into regions.

kmeans()