2. MATRICES Review ORDER ? One way that some people remember that the notation for matrix dimensions is rows by columns (Rather than columns by rows) is by recalling a once popular-soda: RC Cola -- rows before columns! rows and columns of a given matrix The order of a matrix refer to the number of By convention the order of a matrix is given by number of rows x number of column (2 x 3)
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4. Multiplication of Matrices You can multiply two matrices if, and only if, the number of columns in the first matrix equals the number of rows in the second matrix. Otherwise, the product of two matrices is undefined .