Matrix Vol. 2 Exercises
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[For this exercise, first write down your answer, without using R. Then, check your answer using R.]
Answers to the exercises are available here.
Exercise 1
If
M=matrix(c(1:10),nrow=5,ncol=2,
dimnames=list(c('a','b','c','d','e'),c('A','B')))
What is the value of: M
Exercise 2
Consider the matrix M
,
What is the value of:
M[1,]
M[,1]
M[3,2]
M['e','A']
Exercise 3
Consider the matrix N
N=matrix(c(1:9),nrow=3,ncol=3,
dimnames=list(c('a','b','c'),c('A','B','C')))
What is the value of: diag(N)
Exercise 4
What is the value of: diag(4,3,3)
Is matrix ?
Exercise 5
If M=matrix(c(1:9),3,3,byrow=T,
dimnames=list(c('a','b','c'),c('d','e','f')))
What is the value of:
rownames(M)
colnames(M)
Exercise 6
What is the value of:
upper.tri(M)
lower.tri(M)
lower.tri(M,diag=T)
Exercise 7
Consider two matrix,
M,N
M=matrix(c(1:9),3,3,byrow=T)
N=matrix(c(1:9),3,3)
What is the value of:
M*N
Exercise 8
Consider two matrix,
M,N
M=matrix(c(1:9),3,3,byrow=T)
N=matrix(c(1:9),3,3)
What is the value of:
M%*%N
Exercise 9
Consider two matrix,
M,N
M=matrix(c(1:9),3,3,byrow=T)
N=matrix(c(1:9),3,3)
What is the value of:
(M+N)^2
Exercise 10
Consider two matrix,
M,N
M=matrix(c(1:9),3,3,byrow=T)
N=matrix(c(1:9),3,3)
What is the value of:
M/N
Want to practice matrices a bit more? We have more exercise sets on this topic here.
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