In linear algebra, a column vector with m {\displaystyle m} elements is an m × 1 {\displaystyle m\times 1} matrix consisting of a single column of m {\displaystyle m} entries, for example, Similarly, a row vector is a 1 × n {\displaystyle 1\times n} matrix for some n {\displaystyle n}, consisting of a single row of n {\displaystyle n} entries, Wikipedia