created: 10/18/98; revised 08/01/00, 07/28/03, 07/22/04, 07/25/09, 03/08/15
In many fields matrices are used to represent both objects and operations on objects. In computer graphics, points and vectors are represented with column matrices. Operations on those are represented with square matrices.
A column matrix consists of a single column of numbers. Do you think that numbers could be arranged into several rows and several columns?