Mastering R Programming Basics

What is the syntax for an if statement in R?

• if (condition) code_to_execute else code_to_execute_if_false

• if (condition) { code_to_execute } else { code_to_execute_if_false }

• if { condition } then { code_to_execute }

• if condition { code_to_execute }

How do you write an if-else statement in R?

• if (condition) { code_if_true } else code_if_false

• if (condition) { code_if_true } else { code_if_false }

• if condition { code_if_true } else code_if_false

• if (condition) code_if_true else { code_if_false }

What function is used to check multiple conditions in R?

• ifelse() or case_when()

• for()

• switch()

• repeat()

Explain the purpose of the switch statement in R.

• To define a function in R.

• To declare variables in R.

• To create a loop in R.

• The purpose of the switch statement in R is to select and execute code based on the value of an expression.

What is the difference between for loop and while loop in R?

• For loop is used for conditional execution; while loop is for fixed iterations.

• For loop requires a condition to start; while loop does not need any condition.

• For loop can only iterate over vectors; while loop can iterate over any data type.

• For loop iterates a fixed number of times; while loop continues based on a condition.

How do you create a for loop to iterate over a vector in R?

• foreach (i in my_vector) { print(i) }

• for (i in my_vector) { print(i) }

• for (i = 1; i <= length(my_vector); i++) { print(my_vector[i]) }

• for (i in 1:length(my_vector)) { print(i) }

What is the output of the following code: for(i in 1:5) { print(i) }?

• -1

• 1 2 3 4 5

• 6

• 0

How can you break out of a loop in R?

• Use the 'continue' statement to exit a loop in R.

• Use the 'stop' command to terminate a loop in R.

• Use the 'exit' function to break out of a loop in R.

• Use the 'break' statement to exit a loop in R.

What is the purpose of the next statement in a loop?

• To end the loop immediately.

• To repeat the current iteration of the loop.

• To skip the current iteration of the loop.

• To execute the next statement in the loop.

How do you define a function in R?

• Use the 'define' keyword followed by the function name and parameters.

• Functions are defined using the 'create' command and a list of arguments.

• You can define a function by writing 'my_function = function(x) { x^2 }' without the return statement.

• Use the 'function' keyword followed by the function name and parameters, e.g., my_function <- function(x) { return(x^2) }.