What is a Matrix ?
In mathematics, a matrix (plural matrices) is a rectangular array of numbers, symbols, or expressions, arranged in rows and columns.
- 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.
- while m and n are called its dimensions .
The dimensions of the following matrix are 3x3 because there are three rows and three columns.
N.B:
- i describes the number of the row
- j describes the number of the column
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