Write R code(s) (which is R programming codes) to create a numeric vector with 3
ID: 3773784 • Letter: W
Question
Write R code(s) (which is R programming codes) to create a numeric vector with 3 items 1, 2, and 3. The first item 1 has name “one”, the second item has name “two”, the third item has name “three”.
6. Write R code(s) to create the following matrix called counts.
Mon
Tue
Wed
Adam
1
2
3
Bell
4
5
6
Coach
7
8
9
7. Using the matrix counts created in question 7, write R code(s) to
a. retrieve the count for Bell on Wed.
b. retrieve the counts for Coach
c. retrieve the counts on Mon
8. Write codes to add another row of data to the matrix counts created in question 7. The final matrix should looks like the one below.
Mon
Tue
Wed
Adam
1
2
3
Bell
4
5
6
Coach
7
8
9
Dell
10
11
12
9. Write codes to add another column of data to the matrix counts created in question 7. The final matrix looks like below.
Mon
Tue
Wed
Thur
Adam
1
2
3
10
Bell
4
5
6
11
Coach
7
8
9
12
10. Write R code(s) to:
a. Create a matrix calledamatrix that looks like the one below.
[,1]
[,2]
[,3]
[1,]
1
4
7
[2,]
2
5
8
[3,]
3
6
9
b. Create a matrix calledbmatrix that looks like the one below.
[,1]
[,2]
[,3]
[1,]
1
2
3
[2,]
4
5
6
[3,]
7
8
9
c. Transpose amatrix.
d. Calculate the inner multiplication of amatrix and bmatrix.
e. Find the inverse of the element-wise products of amatrix andbmatrix.
Mon
Tue
Wed
Adam
1
2
3
Bell
4
5
6
Coach
7
8
9
Explanation / Answer
6. Write R code(s) to create the following matrix called counts
Ans:
>> counts <- matrix(c(1,2,3,4,5,6,7,8,9),nrow=3,ncol=3)
> names(x) NULL
> names(x) <- col("Mon","Tue","Wed")
7. Using the matrix counts created in question 7, write R code(s) to
a. retrieve the count for Bell on Wed.
b. retrieve the counts for Coach
c. retrieve the counts on Mon
8. Write codes to add another row of data to the matrix counts created in question 7. The final matrix should looks like the one below
>> counts <- matrix(c(1,2,3,4,5,6,7,8,9,10,11,12),nrow=4,ncol=3)
> names(x) NULL
> names(x) <- col("Mon","Tue","Wed")
> names(x) <- row("Adam","Bell","Coach","Dell")
9. Write codes to add another column of data to the matrix counts created in question 7. The final matrix looks like below
>> counts <- matrix(c(1,2,3,10,4,5,6,11,7,8,9,12),nrow=4,ncol=4)
> names(x) NULL
> names(x) <- col("Mon","Tue","Wed","Thur")
> names(x) <- row("Adam","Bell","Coach","Dell")
10. Write R code(s) to:
a. Create a matrix calledamatrix that looks like the one below.
> a <- matrix(1:9,nrow=3)
b. Create a matrix calledbmatrix that looks like the one below.
>b<- matrix(c(1,2,3,4,5,6,7,8,9),nrow=3,ncol=3) ;
c. Transpose amatrix.
> a<- matrix(1:9,nrow=3)
d. Calculate the inner multiplication of amatrix and bmatrix.
> a <- matrix(1:9,nrow=3)
>b<- matrix(c(1,2,3,4,5,6,7,8,9),nrow=3,ncol=3)
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