## Rows and columns Rows are numbered from the top down, whereas columns are numbered from left to right.

## Order of a matrix

The order of a matrix is a descriptor of how many rows and columns there are in a matrix. Effectively, the order of the matrix is given by: number of rows x number of columns. The order of the previous matrix is 3 x 4.

## Types of matrices

### Row matrices A row matrix (or row vector) is a matrix that consists of just one row. Examples of row matrices could be in the order 1 x 4, 1 x 8, 1 x 99.

### Column matrices Column matrices are matrices that consist of only one column. Examples of column matrices

### Square matrices Square matrices describe those with an equal number of rows and columns. Above are two square matrices, one with the order 2×2 and one with the order 3×3

## Notation When referring to elements in a matrix without having specific numbers as substitute, a particular notation to describe the element. As shown above, the row number is indicated before the column number. Sometimes the commas are omitted.