Logical (boolean) type in R Programming - Step-by-Step Execution

Concept Flow - Logical (boolean) type

Assign TRUE or FALSE

↓

Use in condition or variable

↓

Evaluate condition

↓

Execute

↓

End

This flow shows how a logical value (TRUE or FALSE) is assigned and used in conditions to decide which code runs.

Execution Sample

R Programming

x <- TRUE
if (x) {
  print("Yes")
} else {
  print("No")
}

This code assigns TRUE to x and prints "Yes" if x is TRUE, otherwise prints "No".

Execution Table

Step	Action	Expression	Result	Output
1	Assign x	x <- TRUE	x = TRUE
2	Evaluate if condition	if (x)	TRUE
3	Execute if block	print("Yes")	prints Yes	Yes
4	End	No more code	-

💡 Condition x is TRUE, so if block runs and else block is skipped.

Variable Tracker

Variable	Start	After Step 1	After Step 2	Final
x	undefined	TRUE	TRUE	TRUE

Key Moments - 2 Insights

Why does the code print "Yes" and not "No"?

Because the variable x is TRUE at step 2 in the execution_table, the if condition is TRUE, so the if block runs (step 3) and else block is skipped.

Can logical values be stored in variables?

Yes, as shown at step 1, x is assigned the logical value TRUE and keeps it throughout execution.

Visual Quiz - 3 Questions

Look at the execution_table at step 2, what is the value of x?

A TRUE

B FALSE

C NULL

D 0

💡 Hint

Check the 'Result' column at step 2 in the execution_table.

At which step does the program print output?

A Step 1

B Step 2

C Step 3

D Step 4

💡 Hint

Look at the 'Output' column in the execution_table to find when output appears.

If x was FALSE instead of TRUE, what would happen at step 3?

A Print "Yes"

B Print "No"

C No output

D Error

💡 Hint

Think about the else block that runs when the condition is FALSE.

Concept Snapshot

Logical (boolean) type in R:
- Values: TRUE or FALSE
- Stored in variables like x <- TRUE
- Used in conditions: if (x) { ... } else { ... }
- Controls which code runs based on TRUE/FALSE
- Essential for decision making in programs

Full Transcript

This example shows how R uses logical (boolean) values TRUE and FALSE. We assign TRUE to variable x. Then we check if x is TRUE in an if statement. Since x is TRUE, the code inside the if block runs and prints "Yes". If x were FALSE, the else block would run and print "No". Logical values help programs decide what to do next.