Variable assignment (<- and =) in R Programming - Step-by-Step Execution

Concept Flow - Variable assignment (<- and =)

Start

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Assign value with <- or =

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Variable stores value

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Use variable later

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End

Assign a value to a variable using <- or =, then the variable holds that value for later use.

Execution Sample

R Programming

x <- 5
print(x)
y = 10
print(y)

Assign 5 to x using <- and 10 to y using =, then print both variables.

Execution Table

Step	Code executed	Variable	Value	Output
1	x <- 5	x	5
2	print(x)	x	5	5
3	y = 10	y	10
4	print(y)	y	10	10
5	End of code	-	-	-

💡 All assignments done and variables printed, program ends.

Variable Tracker

Variable	Start	After Step 1	After Step 3	Final
x	undefined	5	5	5
y	undefined	undefined	10	10

Key Moments - 2 Insights

Why can we use both <- and = for assignment in R?

Both <- and = assign values to variables in R; <- is traditional and preferred, but = works the same in most cases as shown in steps 1 and 3.

Does print(x) change the value of x?

No, print(x) only shows the value of x (step 2), it does not change x's value as seen in variable_tracker.

Visual Quiz - 3 Questions

Look at the execution table, what is the value of x after step 1?

A 5

B undefined

C 10

D 0

💡 Hint

Check the 'Value' column for variable x at step 1 in the execution_table.

At which step is the variable y assigned a value?

A Step 2

B Step 1

C Step 3

D Step 4

💡 Hint

Look at the 'Code executed' column to find where y is assigned.

If we replaced y = 10 with y <- 20, what would be the output at step 4?

A 10

B 20

C y

D Error

💡 Hint

Variable y's value changes to 20 if assigned with <- 20, so print(y) outputs 20.

Concept Snapshot

Variable assignment in R:
Use <- or = to assign values.
Example: x <- 5 or y = 10
Both store values in variables.
Variables keep values until changed.
Use print() to see variable values.

Full Transcript

This example shows how to assign values to variables in R using two ways: the arrow <- and the equal sign =. First, x is assigned the value 5 using x <- 5. Then, printing x shows 5. Next, y is assigned 10 using y = 10. Printing y shows 10. Both assignment methods store values in variables for later use. The print function only displays the value and does not change it. The program ends after printing both variables.