Find distance between two points in scatter plot

Question

I want to find the distance between two points on a scatter plot. For clarification see the image: Scatter Plot

The challenge is to identify the points using an algorithm (as I want to automate it as much as possible), the rest is just getting distance between coordinates. I would appreciate if someone points me in the right direction.

Answer 1

What you need is the euclidean distance. If you are using python, the package NumPy, which is often used for data analysis, provides a method for this.