Question 01

Create the following vectors a, b, and c a) 2,5,6,7 b) 1,0,9,8 c) 6,5,8,3

Row bind the vectors to form a 3X4 matrix. Change the column names to (Mon, Tue, Wed, Thu). Change the row names to (Present, Absent, On leave). Calculate the row sums and the column sums.

Problem 1a

(5*4)^(4*5)-56
## [1] 1.048576e+26

Problem 1b

23-1*(8-12)
## [1] 27

Problem 1c

56/8*(3+4)
## [1] 49

Problem 1d

45-5*8+(8+9)
## [1] 22

Problem 2

a<-c(2,5,6,7)
b<-c(1,0,9,8)
c<-c(6,5,8,3)
d<-c(a,b,c)

mat<-matrix(d, byrow=TRUE, 
            nrow=3)

print(mat)
##      [,1] [,2] [,3] [,4]
## [1,]    2    5    6    7
## [2,]    1    0    9    8
## [3,]    6    5    8    3
colnames(mat)<-c("Mon", "Tue", "Wed", "Thu")
rownames(mat)<-c('Present', 'Absent', 'On leave')
mat
##          Mon Tue Wed Thu
## Present    2   5   6   7
## Absent     1   0   9   8
## On leave   6   5   8   3
row<-rowSums(mat)
row
##  Present   Absent On leave 
##       20       18       22
col<-colSums(mat)
col
## Mon Tue Wed Thu 
##   9  10  23  18