how to write the dimensions of a matrix
Matrix (mathematics) The size of a matrix is defined by the number of rows and columns that it contains. A matrix with m rows and n columns is called an m × n matrix or m-by-n matrix, while m and n are called its dimensions. For example, the matrix A above is a 3 × 2 matrix.
Neo (The Matrix) In his legitimate activities, he is a quiet programmer for the "respectable software company" Meta Cortex; but he is also a computer hacker who penetrates computer systems illicitly and steals information under his hacker alias "Neo", and he also sells illegal untraceable computer systems and hacking programs along with controlling computer viruses stashed on CDs and diskettes. During his time as a hacker, Anderson has learned about something known only as "The Matrix". It is described as a vague notion that Neo has felt his whole life that "there is something wrong with the world".