R BASICS

INSTALLATION AND FIRST STEPS

R installation is done by downloading and installing the program from the official website. The first steps include getting familiar with the RStudio or R GUI interface and learning the basic syntax

How to install R and RStudio?

R GUI R STUDIO

Check which R version is running

R.version R.version.string getRversion()

How to update R and RStudio?

R GUI RStudio

RStudio themes

Operators

<- + - * / > < & |

DATA TYPES

In R, data types include numeric (integer, decimal), character (text), logical (true/false), complex and raw. Each type has specific characteristics and operations that allow you to manipulate and analyze data in a variety of ways in R

Data types

Numeric Character Logic Complex Raw

Convert objects to numeric with as.numeric()

as.numeric()

Convert objects to character with as.character()

as.character()

WORKING DIRECTORY AND WORKSPACE

In R, the working directory refers to the location in the file system where R looks for and stores files by default while the workspace stores variables and objects to maintain continuity of work between sessions

Workspace

rm() ls() save.image() save() saveRDS() load() readRDS() history()

Working directory

getwd() setwd() dir() list.files() file.create() file.remove() file.copy() file.path() file.info()

FUNCTIONS AND PACKAGES

Functions are reusable blocks of code that perform specific tasks. Packages are sets of functions, data and documentation that extend the functionality of R

Help

? help() help.start() help.search() apropos() RSiteSearch() vignette()

How to install packages ?

install.packages() library()

Create functions

R basics

Warning and error messages

message() warning() stop()

PRINTING VALUES

These functions are used to display results in the console. They help in the visualization and understanding of the generated information, being useful for inspecting data, displaying calculation results or facilitating the communication of results

The print() function

print()

Print and concatenate with cat()

cat()

Print formatted values

sprintf()

FUNCTIONS RELATED WITH TIME

R provides a number of functions to obtain the system date and time, which can be useful in various situations to manage runtimes and other processes

System date and time

R basics

System date and time

R basics

System date and time

R basics