Example 1 [1 2 2 Given Q = 4 5 31 6 and P = L7 8 91 ΤΟ 1 LO Ο 0 0 1 OJ (a) Pre-multiply Q by the permutation matrix P (b) Post-multiply Q by the permutation matrix P

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.6: Permutations
Problem 12E
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Question
Example 1
Given Q =
[1
4
L7
2 31
5
8 9
TO
6 and P = 1
LO
0
0
1 0.
(a) Pre-multiply Q by the permutation matrix P
(b) Post-multiply Q by the permutation matrix P
Transcribed Image Text:Example 1 Given Q = [1 4 L7 2 31 5 8 9 TO 6 and P = 1 LO 0 0 1 0. (a) Pre-multiply Q by the permutation matrix P (b) Post-multiply Q by the permutation matrix P
Example 9
Abbie, Bess, Cath and Denise play off against each other in a series of one-on-one basketball
games. In these games:
.
.
a
b
c
d
Abbie beat Bess
Bess had no wins
Cath beat Bess and Denise
Denise beat Abbie and Bess
Complete a dominance diagram to indicate who has defeated whom.
Find M, the dominance matrix.
Find how many wins each person had.
Find M² and explain what information this matrix gives us.
Find M+ M² and explain how this could be used to work out who won the play-off.
9 Page
Example 10
Four children are observed in a play situation and an impression of any dominance relations is
made. This has been represented on the network diagram.
a Represent this information in the form of a matrix D.
b Calculate D²,
c Describe what is meant by D224 and verify it from the diagram.
d Use the model S=D+D² to decide the ranking of leadership
among the children.
e
f
Why is D¹ used in the S matrix?
Briefly discuss any limitations of this mathematical model.
10 | Page
Transcribed Image Text:Example 9 Abbie, Bess, Cath and Denise play off against each other in a series of one-on-one basketball games. In these games: . . a b c d Abbie beat Bess Bess had no wins Cath beat Bess and Denise Denise beat Abbie and Bess Complete a dominance diagram to indicate who has defeated whom. Find M, the dominance matrix. Find how many wins each person had. Find M² and explain what information this matrix gives us. Find M+ M² and explain how this could be used to work out who won the play-off. 9 Page Example 10 Four children are observed in a play situation and an impression of any dominance relations is made. This has been represented on the network diagram. a Represent this information in the form of a matrix D. b Calculate D², c Describe what is meant by D224 and verify it from the diagram. d Use the model S=D+D² to decide the ranking of leadership among the children. e f Why is D¹ used in the S matrix? Briefly discuss any limitations of this mathematical model. 10 | Page
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