information:filtering, information:classification, information:extraction
Bar chart

A bar chart can represent a function whose domain is a finite set, the natural numbers, or the integers. In this case, an element x of the domain is represented by an interval of the x -axis, and the corresponding value of the function, f (x), is represented by a rectangle whose base is the interval corresponding to x and whose height is f (x) (possibly negative, in which case the bar extends below the x -axis).