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# PS06 - ECE 109 Spring 2010 Name Section Problem Session 6...

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ECE 109 Spring 2010 Name:__________________________________________ Section:______________________ Apr 5-8, 2010 1 Problem Session 6 This problem session is designed to give you some practice two-dimensional data, similar to the video output in Program 2. There’s only one problem, on the next page. You’ll get a grade of 70 just for showing up, so try to earn the remaining 30 percent with a high-quality effort. First we need to learn/review the notion of a matrix. (No, it’s not the movie.) To save me a little time, I’ll quote from Wikipedia 1 : In mathematics, a matrix (plural matrices , or less commonly matrixes ) is a rectangular array of numbers, such as An item in a matrix is called an entry or an element. The example has entries 1, 9, 13, 20, 55, and 4. Entries are often denoted by a variable with two subscripts, as shown on the right. Matrices of the same size can be added and subtracted entrywise and matrices of compatible sizes can be multiplied. These operations have many of the properties of ordinary arithmetic, except that matrix multiplication is not commutative, that is, AB and BA are not equal in general.

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