1 Rmarkdown website for easy introduction to R

2 Basics of R

You can do simple operations and assing that to variables

variable_number <- 2+2

variable_number

## [1] 4

You could also have vectors which represent lists of numbers or characters. You can create a vector by concatenating values c()

vector_numbers <- c(variable_number, 2, 4, 5)

vector_characters <- c("Reactor", "pH", "TOC", "TN")

When you join them you can generate dataframes, which combine characters, factors and numbers

first_column <- rnorm(30, 3, 0.2)
second_column <- rnorm(30, 8, 1.2)
third_column <- runif(30, 1, 8)
dataframe <- data.frame(first_column, second_column, third_column)
head(dataframe, 5)

We can change the name to the dataframe columns

names(dataframe) <- c("one", "two", "three")
head(dataframe, 5)

Now we could select specific rows or columns by the bracket operator

dataframe[rows, columns]

dataframe[1:4,1:2]

we could even plot one against each other

plot(dataframe$one, dataframe$two)

Plots have many possible arguments, for example:

plot(dataframe$one, dataframe$two, 
     xlab = "x axis", ylab="y axis", main="A simple plot", 
     las =1,
     pch =19, col = "blue")