title: algorithm to compare coordinate paths
body: <p>I'm working on a project that is working with paths in 2 dimensional space. The paths are lists of coordinate pairs (x,y) that trace out a route a user has taken, for instance the path of a mouse on the screen for some fixed time, say 5 seconds. I'm looking for a way to group the paths by some measure of "sameness." Are there any algorithms that are designed for this? For instance, if the start position and end position of two paths is similar, and they both travel in some "channel" across the page in some way.</p>