If statements tell R to run a line of code if a condition returns TRUE. We can use an if statement to write a program that prints out the winning team. Let’s start by trying to represent this scenario in R. We could visualize the possible outcomes using this tree chart:Īs we can see in the tree chart, there are only two possible outcomes. Let’s say we’re watching a sports match that decides which team makes the playoffs. The statement x >= f means “Is the value of x greater than or equal to the value of f?” The statement x > e means “Is the value of x greater than the value of e?” The statement x = b means “Does the value of x not equal the value of b?” The statement x = a framed as a question means “Does the value of x equal the value of a?” In R, the most fundamental way to evaluate something as TRUE or FALSE is through comparison operators.īelow are six essential comparison operators for working with control structures in R:
Are my parents home yet?” yields TRUE (“Yes”) or FALSE (“No”). In the kids example above, the statement “It’s 8pm. In order to use control structures, we need to create statements that will turn out to be either TRUE or FALSE. (This tutorial is based on our intermediate R programming course, so check that out as well! It’s interactive and will allow you to write and run code right in your browser.) Comparison Operators in R
BOOLEAN OPERATORS RCODE INSTALL
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Not quite there yet? Check out our Introductory R Programming course that’s part of our Data Analyst in R path. In this tutorial, we assume you’re familiar with basic data structures, and arithmetic operations in R. And unlike some kids, R will always do what we tell it to! You can learn more about control structures in the R documentation if you would like. “ If I’m not home by 8pm, make yourself dinner.”Ĭontrol structures set a condition and tell R what to do when that condition is met or not met. You can think of these as a bit like the instructions a parent might give a child before leaving the house: We can do that using control structures like if-else statements, for loops, and while loops.Ĭontrol structures are blocks of code that determine how other sections of code are executed based on specified parameters. When we’re programming in R (or any other language, for that matter), we often want to control when and how particular parts of our code are executed. SeptemHow to Use If-Else Statements and Loops in R
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