Question

R-Studio (R Programming Language)

1. How would you create a vector `V` containing the values 0, 0.25, 0.5, 0.75, and 1?
  
```{r}
#insert your code
```

2. Name the elements of `V`: first, second, middle, fourth, last. Describe two ways of naming elements in `V`

```{r}
#insert your code
```

3. Suppose you keep track of your mileage each time you fill up. At your last 6 fill-ups the mileage was
65311 65624 65908 66219 66499 66821 67145 67447. Enter these numbers into R as vector `miles`. Use the function `diff` on the data `miles`. What does it give? Use `sum` on the computed differences to find the total travelled distance.

```{r}
#insert your code
```

Answer 1

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Code is as below:

#R version 3.3.2

#create a vector `V` containing the values 0, 0.25, 0.5, 0.75, and 1

V <- c(0, 0.25, 0.5, 0.75, 1)

#first way to name elements

names(V) <- c("first","second","middle", "fourth","last")

#another way to name element is using setnames method as below

V <- setNames(1:5, c("first","second","middle", "fourth","last"))

#Below line is used to verify the output, you can remove it

V

#create a vector miles using difference mileage readings

miles <- c(65311, 65624, 65908, 66219, 66499, 66821, 67145, 67447)

#diff gives the difference between the element in vector mileage2-mileage1, mileage3-mileage2,

#mileage4-mileage3, mileage5-mileage4, mileage6-mileage5, mileage7-mileage6

print("difference in miles: ")

diff(miles)

#to calculate the sum of total traveled distance

print("Total traveled distance :")

sum(diff(miles))

================screen shot of the code================

Output:

Output after using second way of naming the element using setNames

Output after doing diff on Miles and then sum for getting total traveled distance: