Introduction

What is a for loop?

For loops allow you to perform an operation iteratively in R (e.g., instead of repeating lines of code). Most functions you use in R are built using for loops.

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for (i in x) {

perform some operation using each value of x

}

i stands for iteration, and is set to each value of x in each iteration of the loop

x could be a vector, list, matrix, or any other sequence of values/objects

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What is a conditional statement?

Conditional statements allow you to perform operations based on a logical statement, and can be used alone, or often more powerfully within a for loop.

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if (logical statement) {

perform some operation if logical statement is true

}

This logical statement can be anything with an outcome of true/false. We will go over examples of these in the tutorial.

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