## R – Sort Data Frame by Column

In this tutorial, we shall learn to sort a data frame by column in ascending order and descending order with example R scripts using R with function and R order function.

A data frame is a set of equal length objects.

Let us take aata frame as shown in the following.

```df <- data.frame(names = c("Andrew", "Mathew", "Dany", "Philip", "John", "Bing", "Monica"),
age = c(28, 23, 49, 29, 38, 23, 29),
income = c(25.2, 10.5, 11, 21.9, 44, 11.5, 45))```

The data frame has three columns : names, age, salary

We will sort these three columns in ascending or descending order in the following examples.

### Sort in Ascending order

The syntax to sort a data frame in ascending order is

`dataframe_name[with(dataframe_name, order(column_name)), ]`

### Example 1 – Sort Data Frame in Ascending Order

In this example, we will sort our data frame in ascending order.

r_dataframe_sort_asc.R

```# R program to sort data frame by column in ascending order

df <- data.frame(names = c("Andrew", "Mathew", "Dany", "Philip", "John", "Bing", "Monica"),
age = c(28, 23, 49, 29, 38, 23, 29),
income = c(25.2, 10.5, 11, 21.9, 44, 11.5, 45))

cat("\n\n Sort data frame by names in ascending order\n")
# to sort data frame by names in ascending order
df_sorted_names_asc <- df[with(df, order(names)), ]

print(df_sorted_names_asc)

cat("\n\n Sort data frame by age in ascending order\n")
# to sort data frame by age in ascending order
df_sorted_age_asc <- df[with(df, order(age)), ]

print(df_sorted_age_asc)

cat("\n\n Sort data frame by income in ascending order\n")
# to sort data frame by income in ascending order
df_sorted_asc <- df[with(df, order(income)), ]

print(df_sorted_asc)```

Output

```\$ Rscript r_dataframe_sort_asc.R

Sort data frame by names in ascending order
names age income
1 Andrew  28   25.2
6   Bing  23   11.5
3   Dany  49   11.0
5   John  38   44.0
2 Mathew  23   10.5
7 Monica  29   45.0
4 Philip  29   21.9

Sort data frame by age in ascending order
names age income
2 Mathew  23   10.5
6   Bing  23   11.5
1 Andrew  28   25.2
4 Philip  29   21.9
7 Monica  29   45.0
5   John  38   44.0
3   Dany  49   11.0

Sort data frame by income in ascending order
names age income
2 Mathew  23   10.5
3   Dany  49   11.0
6   Bing  23   11.5
4 Philip  29   21.9
1 Andrew  28   25.2
5   John  38   44.0
7 Monica  29   45.0```

### Sort in Descending order

The syntax to sort a data frame in descending order is

`dataframe_name[with(dataframe_name, order(-column_name)), ]`

Please observe the ‘-‘ negative sign before the column_name to sort in descending order

### Example 2 – Sort Data Frame in Descending Order

In this example, we will sort our Data Frame in descending order.

r_dataframe_sort_desc.R

```# R program to sort dataframe by column in descending order

df <- data.frame(names = c("Andrew", "Mathew", "Dany", "Philip", "John", "Bing", "Monica"),
age = c(28, 23, 49, 29, 38, 23, 29),
income = c(25.2, 10.5, 11, 21.9, 44, 11.5, 45))

cat("\n\n Sort data frame by names in descending order\n")
# to sort data frame by names in descending order
df_sorted_names_desc <- df[with(df, order(-names)), ]

print(df_sorted_names_desc)

cat("\n\n Sort data frame by age in descending order\n")
# to sort data frame by age in descending order
df_sorted_age_desc <- df[with(df, order(-age)), ]

print(df_sorted_age_desc)

cat("\n\n Sort data frame by income in descending order\n")
# to sort data frame by income in descending order
df_sorted_desc <- df[with(df, order(-income)), ]

print(df_sorted_desc)```

Output

```\$ Rscript r_dataframe_sort_desc.R

Sort data frame by names in descending order
Warning message:
In Ops.factor(names) : ‘-’ not meaningful for factors
names age income
1 Andrew  28   25.2
2 Mathew  23   10.5
3   Dany  49   11.0
4 Philip  29   21.9
5   John  38   44.0
6   Bing  23   11.5
7 Monica  29   45.0

Sort data frame by age in descending order
names age income
3   Dany  49   11.0
5   John  38   44.0
4 Philip  29   21.9
7 Monica  29   45.0
1 Andrew  28   25.2
2 Mathew  23   10.5
6   Bing  23   11.5

Sort data frame by income in descending order
names age income
7 Monica  29   45.0
5   John  38   44.0
1 Andrew  28   25.2
4 Philip  29   21.9
6   Bing  23   11.5
3   Dany  49   11.0
2 Mathew  23   10.5```

Note : Descending order is not applicable for Character Datatypes. Observe lines (5,6) with a warning message.

### Conclusion

In this R Tutorial, we have learnt to sort a data frame by column in ascending and descending order.