7.4 Exercice 1. Getting started ~ 10 minutes

Create the script “exercise1.R” (in R Studio: File -> New File) and save it to the “Rcourse/Module1” directory: you will save all the commands of exercise 1 in that script.
Remember you can comment the code using #.

1- From the console, go to Rcourse/Module1. First check where you currently are with getwd(); then go to Rcourse/Module1 with setwd(). Remember that ~ is a shortcut to your home directory.

Answer

getwd()
setwd("Rcourse/Module1")
setwd("~/Rcourse/Module1")

2- Using R as a calculator, calculate the square root of 654 (don’t know the function? Search the internet!).

Answer

sqrt(654)

## [1] 25.57342

3- Create a new object “myobject” that contains value 60. Show “myobject” in the console.

Answer

myobject <- 60
myobject

## [1] 60

4- Subtract 1 from myobject. Reassign.

Answer

myobject <- myobject - 1

5- Create a new object “mysqrt” that will store the square root of “myobject.”

Answer

mysqrt <- sqrt(myobject)

6- Create a new object “mydiv” that will store the result of “myobject” divided by “mysqrt.”

Answer

mydiv <- myobject / mysqrt