R Basics

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Problem 1:

  1. From set = {1.5, 15, 0, 54, 23}, pick two numbers and perform the Following Operations:

.Subtraction .Multiplication .square root

54 - 23
## [1] 31
54 * 23
## [1] 1242
round(sqrt(54),2)
## [1] 7.35
round(sqrt(23),2)
## [1] 4.8

Problem 2

Suppose you have a set of numbers representing the assignments scores:

scores <- c(87,100, 91, 95, 81.5, 0, 39, 74, 92)

#Calculate the average of the scores, and round your answer to two decimal number

avg <- round(mean(scores),2)
avg
## [1] 73.28
#Find the Maximum and Minimum score
max(scores)
## [1] 100
min(scores)
## [1] 0
#Find how many scores were above the average, use coding for this
scores[scores  > avg]
## [1]  87.0 100.0  91.0  95.0  81.5  74.0  92.0
#Create a new set called new_scores that includes the elements from indices 2 to 6 of the scores vector

new_scores <- scores[2:6]

Problem 3:

Read section 2.3, then answer the following questions

# Create a vector with the number 1 repeated 5 times. Print it
firstList <- c(1, 1, 1, 1, 1)
firstList
## [1] 1 1 1 1 1
# Create a vector with a sequence of numbers from 1 to 10 with a step of 2. Print it
secondList <- c(2,4,6,8,10)
secondList
## [1]  2  4  6  8 10
# Create a vector by repeating a sequence from 1 to 3, 2 times. Print it.
thirdList <- c(1, 2, 3, 1, 2, 3)
thirdList
## [1] 1 2 3 1 2 3

Problem 4

mixed_vector <- c(1, "two", 3.0, TRUE, 2)

# Check the class of the vector

data <-  c(0,0,0,0)

## Coerce to numeric and print it