Slicing high dimensional arrays

When we learned about matrices it wasn't hard to think of slicing 2D matrices along rows and columns. But what about slicing higher dimensional matrices? I always get confused when I go above 3-dimensions. Interestingly, for me, an easy way to imagine slicing such high dimensional matrices is by using trees and thinking of how …

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Beautiful Data

Why do we visualize data? One reason is that it can be aesthetically pleasing. The beauty of data, of course, is in the eye of the data collector. Often data looks beautiful to me simply because I put a lot of effort into collecting it. But in general, I consider data visualization as one of …

Ball and Chain

I have some data where each point consists of two values (x,y). A large bunch of the (x,y) values are likely to come from a distribution centered around the origin. A few of the points may come from distributions where x is significantly greater than zero. I wanted to find out if y for those …