ECON222 WEEK2 -Matrices-2(HW WEEK4)

# ECON222 WEEK2 -Matrices-2(HW WEEK4) - Lecture 6 part...

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1 1 Lecture 6 part 2-Topic: Matrices Reading for this lecture H&P, Ch 6, Sect 6.2. Homework for Tutorial in Week 4 Ex 6.2, pp. 237-238, problems 1, 17, 29, 35, 41. 2 Matrix Addition A = [ a ij ] and B = [ b ij ] can be added if, and only if, they are of the same order, mxn. A + B is an mxn matrix whose elements are the sum of the corresponding elements in A and B . That is, Example 3 Aside: “If and only if . .” e.g. A = [ a ij ] and B = [ b ij ] can be added if, and only if, they are of the same order, mxn. Any two matrices of the same order can be added. Two matrices that can be added must be of the same order. “If” means A & B are of same order implies A & B can be added. A & B cannot be added implies A & B are not of same order. “Only if” means A & B can be added implies A & B are of same order. A & B are not of same order implies A & B cannot be added. 4 Principles in Practice 1, p.233 An office furniture company manufactures desks and tables at 2 plants, A and B .

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## This note was uploaded on 06/16/2010 for the course ECON 220 taught by Professor Drea during the Spring '10 term at Uni. West.

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ECON222 WEEK2 -Matrices-2(HW WEEK4) - Lecture 6 part...

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