An m × NUMBER@1 matrix -LRB- one column and m rows -RRB- is called a column vector and a NUMBER@1 × n matrix -LRB- one row and n columns -RRB- is called a row vector .

A matrix with m rows and n columns is called an m-by-n matrix -LRB- or m & times ; n matrix -RRB- and m and n are called its dimensions . One column matrix A matrix , that has many rows , but only one column , is called a column vector .
