In the R programming language, you can use a negative index in order to exclude an element from a list or a row from a matrix. For example, the syntax x[-1] means "all elements of x except for the first." In general, if v is a vector of indices to
If you live in the US, do you remember the Dunkin Donuts commercial from about 30 years ago. It opens with a devoted donut maker climbing out of bed, saying "It's time to make the donuts." (Donut makers have to get up early so that you and I can have
Following up on the theme of graphs commonly used in many applications, here is another one that displays a horizontal bar chart with multiple data columns aligned with the bars. Recently at WUSS, a user stopped by asking how to create just such a graph. While this user wanted something more complex
