The R programming language comes with a number of useful functions and data structures to work with data. A dataframe in R is used to store two-dimensional data (in the form of rows and columns). In this tutorial, we will look at how to create a dataframe in R with the help of some examples.

## How do I create a dataframe in R?

You can use the `data.frame()`

function to create a dataframe in R. Pass the columns that you want to have in the dataframe as vectors to the `data.frame()`

function.

The following is the syntax –

# create a dataframe df = data.frame(col_name=col_data)

You can specify the name of the column and pass the corresponding column values as a vector.

## Examples

Let’s now look at some examples of creating a dataframe using the above syntax –

Let’s say we have the following two vectors representing the name and age of some students in a university.

# create vectors name <- c("Ben", "Quinton", "Virat", "Smriti", "Jos") age <- c(23, 27, 24, 21, 26)

Note that the values in the `name`

and the `age`

vectors are related. That is, values at each index correspond to a particular student. For example, student 1’s name is `name[1]`

and age is `age[1]`

.

Let’s now create a dataframe to capture this related information better.

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# create a dataframe students_df = data.frame( "Name"= name, "Age"= age ) # display the dataframe print(students_df)

Output:

Name Age 1 Ben 23 2 Quinton 27 3 Virat 24 4 Smriti 21 5 Jos 26

Here, we create a dataframe with two columns “Name” and “Age”. We use the `name`

vector as values for the “Name” column and the `age`

vector as values for the “Age” column.

From the above dataframe, we can intuitively say that Ben’s age is 23.

The above operations can also be done by directly creating the vectors inside the `data.frame()`

function. Here, we directly pass the age and name values to the dataframe.

# create a dataframe students_df = data.frame( "Name"= c("Ben", "Quinton", "Virat", "Smriti", "Jos"), "Age"= c(23, 27, 24, 21, 26) ) # display the dataframe print(students_df)

Output:

Name Age 1 Ben 23 2 Quinton 27 3 Virat 24 4 Smriti 21 5 Jos 26

We get the same result as above.

## Accessing values in an R dataframe

Rows and columns in an R dataframe are indexed starting from 1. You can use the `[]`

notation to access values from a dataframe in R. The following is the syntax –

# access value at row r and column c in dataframe df df[r, c]

Here, we want to get the value in row `r`

and column `c`

in the dataframe `df`

.

Let’s look at an example.

In the dataframe created above, let’s get the value at row 3 and column 1.

# dataframe value at row 3, column 1 print(students_df[3, 1])

Output:

[1] "Virat"

We get “Virat” as the value in row 3 and column 1 which basically gives us the value of the “Name” column in row 3.

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