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IF ELSE, ELSE IF Statement in R

Posted in Programming   LAST UPDATED: SEPTEMBER 22, 2022

    In this post, you are going to learn about if else and else if statements in R. We'll see the Syntax of If else statement in R and examples of these conditional statements.

    If else and else if statement in R

    IF ELSE Statement in R

    If Else statement in R has a condition. When the condition is true, if block is executed and when the condition is false, else block is executed.

    else Block is optional in R.

    Syntax of if else statement in R -

    if (condition) {
    statement1
    } else {
    statement2
    }

    Example -

    x <- -5
    if(x > 0){
    print("Positive number")
    } else {
    print("Negative number")
    }


    Negative number

    In the above example, the variable x holds the value -5. The condition in this conditional statement will be true if x is greater than 0 otherwise, it will be false.

    In the above example, the value of x is -5 therefore, the outcome will be "Negative Number".

    ELSE IF Statement in R

    The else if statement is used when you have two or more conditions unlike if else that has only one condition to check.

    Syntax of ELSE IF statement in R -

    if (condition1) {
    statement1
    } else if (condition2) {
    statement2
    } else if (condition3) {
    statement3
    } else {
    statement4
    }

    Example -

    x <- 0
    if (x < 0) {
    print("Negative number")
    } else if (x > 0) {
    print("Positive number")
    } else
    print("It's Zero")


    It's Zero

    In the above example of else if statement, the variable x holds the value 0. The if block will be executed if the condition x < 0 is true. The else if block will be executed if the condition x > 0 is true otherwise the else statement will be executed.

    The variable x is 0 then the output will be "It's Zero".

    Related Questions

    1). What is the syntax of if-else else if in R?

    Syntax -

    if(boolean_expression 1) {
       // Executes when the boolean expression 1 is true.
    } else if( boolean_expression 2) {
       // Executes when the boolean expression 2 is true.
    } else if( boolean_expression 3) {
       // Executes when the boolean expression 3 is true.
    } else {
       // executes when none of the above conditions are true.
    }

    2). How do you do two if statements in R?

    Use logical operators like && (and), || (or) and ! (not) to join two or more conditions.

    3). How do you write an If then statement in R?

    To run an if-then statement in R, use the if() {} function.

    4). Does elif work in R?

    There is an if-elif else statement in R.

    Published by: avdhoottt
    Tags:r-languageif-elseconditional-statement
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