arrange() for sorting in R Programming - Step-by-Step Execution

Concept Flow - arrange() for sorting

Start with data frame

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Call arrange() with column(s)

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Check sorting order

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Reorder rows based on column values

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Return sorted data frame

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End

arrange() takes a data frame and sorts its rows by one or more columns, returning a new sorted data frame.

Execution Sample

R Programming

library(dplyr)
data <- data.frame(name=c('Bob','Alice','Eve'), age=c(25,30,22))
sorted_data <- arrange(data, age)

Sorts the data frame by the 'age' column in ascending order.

Execution Table

Step	Action	Input Data	Sorting Column	Resulting Order	Output
1	Start with original data	[Bob(25), Alice(30), Eve(22)]	-	[Bob, Alice, Eve]	Original data frame
2	Call arrange() on 'age'	[Bob(25), Alice(30), Eve(22)]	age	-	-
3	Compare ages: 25, 30, 22	-	-	-	-
4	Sort rows by age ascending	-	-	[Eve(22), Bob(25), Alice(30)]	-
5	Return sorted data frame	-	-	-	[Eve(22), Bob(25), Alice(30)]

💡 All rows sorted by 'age' ascending, arrange() returns the sorted data frame.

Variable Tracker

Variable	Start	After arrange() call	Final
data	[Bob(25), Alice(30), Eve(22)]	[Bob(25), Alice(30), Eve(22)]	[Bob(25), Alice(30), Eve(22)]
sorted_data	NULL	[Eve(22), Bob(25), Alice(30)]	[Eve(22), Bob(25), Alice(30)]

Key Moments - 2 Insights

Why does arrange() not change the original data frame 'data'?

arrange() returns a new sorted data frame and does not modify the original. See execution_table step 5 where sorted_data is assigned the sorted result, but 'data' remains unchanged.

How does arrange() decide the order when sorting by a column?

arrange() compares the values in the specified column(s) and orders rows from smallest to largest by default, as shown in execution_table step 4.

Visual Quiz - 3 Questions

Look at the execution_table, what is the order of rows after step 4?

A [Eve(22), Bob(25), Alice(30)]

B [Bob(25), Alice(30), Eve(22)]

C [Alice(30), Bob(25), Eve(22)]

D [Eve(22), Alice(30), Bob(25)]

💡 Hint

Check the 'Resulting Order' column in execution_table row 4.

At which step does arrange() compare the values to sort?

A Step 2

B Step 3

C Step 4

D Step 5

💡 Hint

Look at the 'Action' column describing comparison in execution_table.

If we sorted by 'name' instead of 'age', how would the final order change?

A [Eve, Bob, Alice]

B [Bob, Alice, Eve]

C [Alice, Bob, Eve]

D [Alice, Eve, Bob]

💡 Hint

Sorting by 'name' orders alphabetically; check variable_tracker for how sorting changes output.

Concept Snapshot

arrange(data, column1, ...) sorts rows of a data frame by specified columns.
Default order is ascending.
Returns a new sorted data frame; original data unchanged.
Use desc(column) inside arrange() for descending order.
Works with multiple columns for tie-breaking.

Full Transcript

The arrange() function in R sorts a data frame by one or more columns. It takes the original data frame and returns a new one with rows ordered by the values in the specified column(s). The sorting is ascending by default. The original data frame remains unchanged. For example, arranging by age orders rows from youngest to oldest. The process involves comparing values in the sorting column, reordering rows accordingly, and returning the sorted data frame. This visual trace shows each step from starting data, calling arrange(), comparing values, sorting, and returning the result.