How to write if and else if in R?
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# How to write if and else if in R?

This recipe helps you write if and else if in R

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## Recipe Objective

Conditional statements control the flow of the program. There are some cases where you need to execute a function only when a certain condition is met and some different function if it is not. We can carry out this task using if...else statements in R.

Nested if..else if...else statements is one type of statement where you check multiple conditions and execute the functions accordingly. This recipe demonstrates how to use the nested if..else statements.

Syntax:

if (boolean_expression1) { // statements you want to execute if the if the boolean expression1 is TRUE } else if (boolean_expression2) { // statements you want to execture if the boolean_expression2 is TRUE } else { // statements you want to execute if all the above conditions are False }

Example: We will check different elements present in the vector using nested if..else statement

## Step 1: Create a numeric vector

vec_ = c("Rome", "Mumbai", "NewYork", "Edinburgh")

## Step 2: Nested if..else if..else

We will use %in% operator in the boolean expression to check the elements present in the vector

if ("Delhi" %in% vec_){ print("Delhi is present in the vector") } else if ("NewYork" %in% vec_){ print("New York is present in the vector ") } else { print("New York and Delhi not present in the vector ") }
[1] "New York is present in the vector "

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