Q1. What is two to the power of five?
Output: 32
2^5## [1] 32Q2. Create a vector called stock_prices with thefollowing data points: 23,27,23,21,34.
output: 23 27 23 21 34
stock_prices <- c(23, 27, 23, 21, 34)
stock_prices## [1] 23 27 23 21 34Q3. Assign names to the price data points relating to the day of the week, starting with Mon, Tue, Wed, etc…
Output:
Mon Tues Wed Thu Fri
23 27 23 21 34
names(stock_prices) <- c('Mon','Tues','Wed','Thu','Fri')
stock_prices## Mon Tues Wed Thu Fri
## 23 27 23 21 34Q4. Create a vector called over_23 consisting of logicals that correspond to the days where the stock price was more than $23
Output: Mon Tues Wed Thu Fri FALSE TRUE FALSE FALSE TRUE
This is actually a logical test on the elements in the stock_prices vector.
We can simply check if the vector is > 23 to return the logical test results.
over_23 <- stock_prices > 23
over_23## Mon Tues Wed Thu Fri
## FALSE TRUE FALSE FALSE TRUEQ5. Create a 4x3 matrix with values from 1 to 12
matrix(1:12, nrow = 4)## [,1] [,2] [,3]
## [1,] 1 5 9
## [2,] 2 6 10
## [3,] 3 7 11
## [4,] 4 8 12Q6. multiple the matrix created in Q5 by 10.
m <- matrix(1:12, nrow = 4)
m * 10## [,1] [,2] [,3]
## [1,] 10 50 90
## [2,] 20 60 100
## [3,] 30 70 110
## [4,] 40 80 120Q1. Write a script that prints "“use the force!” if the variable x is equal to 1.
hint: create a variable and assign 1 to it. Then create an if statement.
Try the if statement yourself using a different value for x.
x <- 1
ifelse(x == 1, print("use the force!"),
print("blah blah blah"))## [1] "use the force!"## [1] "use the force!"Q2. Write a script that will print “To infinity and beyond!” if the variable y is an even number.
Othewise, print “Meditate on this, I will”
Try different values of y.
y <- 3
ifelse(y %% 2 == 0,
print("To infinity and beyond!"),
print("Meditate on this, I will"))## [1] "Meditate on this, I will"## [1] "Meditate on this, I will"