R Variables

R Variables

 1. Creating Variables in R

R mainly uses the assignment operator <-.

•  You can also use =, but <- is preferred.

 2. Rules for Variable Names

•  Must start with a letter or dot (.)
•  Can contain letters, numbers, underscore (_), dot (.)
•  Cannot start with a number
•  Cannot use R reserved keywords

 3. Case Sensitivity

R is case-sensitive.

• marks and Marks are different variables

 4. Types of Values Stored in Variables

R automatically detects the data type.

 5. Printing Variable Values

 6. Multiple Variable Assignment

 7. Variable Reassignment

•  Latest value replaces old value

 8. Removing Variables

Remove multiple variables:

Remove all variables:

 9. Check Variable Type

 10. Best Practices for Variables

•  Use meaningful names (total_marks, student_age)
•  Use lowercase with underscore
•  Avoid single-letter variables (except loops)

 Summary

• Variables store data

• <- is preferred assignment operator

• R is case-sensitive

• Variables can be reassigned