a <- 2Exercise 1: Solutions first part
Task 1.1
Assign the number 2 to an object a.
Task 1.2
Take the natural logarithm of a.
log_a <- log(a)
log_a[1] 0.6931472Task 1.3
Assign a new object using sin <- a.
sin <- a
sin[1] 2Task 1.4
What will be the output of sin(sin)? Try to predict the output before executing the code!
sin(sin)[1] 0.9092974No error here as R is smart enough to interpret the oobject with (...) as a function!
Task 1.5
Assign a new variable b with the value TRUE.
b <- TRUE
b[1] TRUETask 1.6
What will be the result of 1 + b? Why?
result_1_plus_b <- 1 + b
result_1_plus_b[1] 2Explanation: In R, TRUE will b automatically casted to a numeric value of 1. So 1 + 1 = 2.
Task 1.7
What will be the result of sqrt(b)?
result_sqrt_b <- sqrt(b)
result_sqrt_b[1] 1Explanation: Since TRUE is 1 in numeric terms, sqrt(1) = 1.
Task 1.8
What is the value of b+b?
result_b_plus_b <- b + b
result_b_plus_b[1] 2Explanation: TRUE + TRUE is 1 + 1 = 2.
Task 1.9
Assign a new variable c with the value '1'.
c <- "1"
c[1] "1"Task 1.10
What will be the result of 1 + c? Why?
Explanation: This will result in an error because c is a character string and cannot be added to a numeric value.
# Next line will throw an error
# result_1_plus_c <- 1 + cWe could use the function as.numeric and try to make a numeric from it:
result_1_plus_c <- 1 + as.numeric(c)
result_1_plus_c[1] 2