How to Add Row to DataFrame in R?

In order to add a new row to DataFrame in R, first, you need to create either a vector or a list with the row values. And assign this to the DataFrame to add a row. In this article, I will explain how easy to add rows to the DataFrame.

The following methods are used to add a row to DataFrame in R.

1. rbind() from R base
2. add_row() from tibble or tidyverse
3. rows_insert() from dplyr

1. Quick Examples of Add Row to DataFrame

The following are quick examples of how to add rows to a data.frame in R

# Quick Examples

# Add Row to the DataFrame
# This converts all types to string
df[nrow(df) + 1,] <- c(33, 50, "java")

# Add Row to the DataFrame 
# with out changing data types
df[nrow(df) + 1,] <- list(33, 50, "java")

# Add Row using rbind()
new_row = c(id = 33, pages=50, name = "java")
df3 = rbind(df,new_row)

# Add data.frame with another
df2 = data.frame(id = 33, pages=50, name = "java")
df3 = rbind(df,df2)

# using tibble/tidyverse
library(tidyverse)
df2 <- df %>% 
   add_row(id = 33, pages=50, name = "java")

# Using dplyr
library(dplyr)
df2 = data.frame(id = 33, pages=50, name = "java")
df3 <- df %>% 
  rows_insert(df2)

Let’s create an R DataFrame, run these examples and explore the output. If you already have data in CSV you can easily import CSV files to R DataFrame. Also, refer to Import Excel File into R.

# Create dataframe
df = data.frame(id=c(11,22),
              pages=c(32,45),
              name=c("spark","python"))
df

# Output
#  id pages   name
#1 11    32  spark
#2 22    45 python

2. Add Row to DataFrame

To add a new row to the DataFrame (data.frame) in R, first, you need to get the number of rows in the existing data frame using nrows(df) and add this new row towards the end nrow(df) + 1. The following example adds a new row at the end of the dataframe.

# Add Row to the DataFrame
# This converts all types to string
df[nrow(df) + 1,] <- c(33, 50, "java")
df

# Output
#  id pages   name
#1 11    32  spark
#2 22    45 python
#3 33    50   java

When you have mixed data types some columns are numeric and some columns are text, then it converts all columns to text. You can check this by running str(df).

3. Add Rows by Not Changing Data Types

Use list() instead of a vector to add a row. Adding a list() as a row to the dataframe doesn’t change the types. You can run str(df) and validate the result yourself.

# Add Row to the DataFrame 
# with out changing data types
df[nrow(df) + 1,] <- list(33, 50, "java")
df

4. Add Row using rbind()

The rbind() function in R, short for row-bind, is used to combine vectors, lists, matrices, and data frames by rows. The following example adds a list as a row to the DataFrame.

# Add Row using rbind()
new_row = list(id = 33, pages=50, name = "java")
df3 = rbind(df,new_row)
df3

5. Add DataFrame as a Row

You can also use rbind() to append the dataframe. When you do this, you have to set consistent column names for all the data frames you want to append.

# Add data.frame with another
df2 = data.frame(id = 33, pages=50, name = "java")
df3 = rbind(df,df2)
df3

6. Use add_row() from tibble or tidyverse

The packages tibble or tidyverse provides a function add_row() to add a row to DataFrame in R. This is a convenient way to add one or more rows of data to an existing data frame.

In order to use this function first, you need to install R package by using install.packages("tidyverse") and load it using the library("tidyverse").

# syntax
add_row(.data, ..., .before = NULL, .after = NULL)

Example

# using add_row() From tibble or tidyverse
library(tidyverse)
df2 <- df %>% 
   add_row(id = 33, pages=50, name = "java")
df2

7. Use rows_insert() from dplyr

Finally, use rows_insert() function from the dplyr package to add a row to R DataFrame. You need to install and load this package in order to use this function.

# Using rows_insert() from dplyr
library(dplyr)
df2 = data.frame(id = 33, pages=50, name = "java")
df3 <- df %>% 
  rows_insert(df2)
df3

8. Conclusion

In this article, you have learned how to add a row to DataFraem in R by using rbin() base library, add_row() from tibble or tidyverse, and rows_inser() from dplyr.

Related Articles

• How to Add Column to DataFrame in R?
• Add Empty Columns to DataFrame
• How to Add Element to List in R?
• How to Add Element to Vector in R?
• Add or Append Element to Vector in R?
• Add or Append Element to List in R?
• How to Add Empty Column to DataFrame in R?
• Add Column to DataFrame in R

References

• https://dplyr.tidyverse.org/reference/rows.html