An m-by-n matrix is a rectangular array of numbers containing m rows and n columns. The following, for example, is a 3-by-3 matrix:

Consider two matrices, A and B. Suppose that the number of columns in matrix A equals the number of rows in matrix B. Then, multiply matrix A by matrix B. (The product is written as AB.) The entry in row I and column J of AB is computed by applying the SUMPRODUCT function to row I of A and column J of B. AB will have as many rows as A and as many columns as B. The Excel MMULT function is an array function with which you can multiply matrices. Use the MMULT function to multiply the following matrices:

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