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Matrix Addition and Subtraction
Adding or subtracting matrices is simple and can be accomplished by adding/subtracting the corresponding matrix elements: crs := ars + brs, with C, A, and B being the respective matrices. The order of the matrices A and B must be the same. Matrices of unequal order cannot be added or subtracted. The zero matrix 0 naturally arises from subtracting two indentical matrices and contains only zero elements. A - A = 0 Let's take a look at an example:  This text is part of "Teach/Me Data Analysis" and has been included by permission of the author.
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Last Update: 2005-01-18