### Matrices

**Matrices** provide an alternative to ordinary linear algebra which allows us to deal with multi-dimensional data in a more concise way.- They are similar in form to a table, with a number of entries arranged into rows and columns.
- The
**size **of a matrix is expressed in the form **rows x columns **(i.e. the number of rows followed by the number of columns, with a cross separating them). - We can refer to a specific element in a matrix using the name of the matrix, with a subscript listing the row and column corresponding to the element in question e.g. for a matrix; A, the element in the 2
^{nd} row and 1^{st} column is denoted by A_{2,1}

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