R Examples

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R Syntax

Output some text Output numbers Do a simple calculation Output some text with the print() function

R Comments

Single-line comment before a line of code Single-line comment at the end of a line of code Multi-line comment

R Variables

Creating two variables Combine both text and a variable Add a variable to another variable Display the sum of two variables by using the + operator Assign the same value to multiple variables in one line

R Data Types

Changing the type of a variable after it has been set Using the class() function to check the data type of different variables

資料型別解釋

R Numbers

Creating a numeric data type Creating an integer Creating a complex number Converting from one type to another

R Math

Add numbers Subtract numbers Find the lowest or highest number in a set Find the square root of a number Return the absolute (positive) value of a number Round a number upwards and downwards to its nearest integer

R Strings

Creating a string literal Assigning a string to a variable Find the number of characters in a string Check a string for a character or a sequence of characters Combine/concatenate two strings Using an escape character to output a word in a string

R Booleans

Compare different values Compare variables

布林值解釋

R Operators

Addition operator Subtraction operator Multiplication operator Division operator Exponent operator Modulus operator Integer Division operator Equal operator Not equal operator Greater than operator Less than operator Greater than or equal to operator Less than or equal to operator

運算子解釋

R If...Else

If statement Else if statement If else statement Nested if statements The AND operator (&) The OR operator (&)

If...Else 解釋

R While Loop

While loop While loop with a break While loop with the next statement If..else combined with a while loop

While迴圈解釋

R For Loop

Using a for loop to iterate over a sequence Using a for loop to print every item in a list Using a for loop to print the number of dices If..else combined with a for loop A nested for loop

For Loop Explained

R Functions

Call a function Function arguments Default parameter value Let a function return a value Nested function Recursion

R Global Variables

Create a variable outside of a function and use it inside the function Create a variable inside of a function with the same name as the global variable Create a global variable inside a function

Global Variables Explained

R Vectors

Create a vector of strings Create a vector of numbers Create a vector with numerical values in a sequence Find the length of a vector Sort a vector Access a vector Change a vector item

Vectors Explained

R Lists

Create a list Access lists Change item value List length

Lists Explained

R Matrices

Create a matrix Access matrix items Matrix length

Matrices Explained

R Arrays

Create arrays Access matrix items Array length

R Data Frames

Create a data frame Access data frame items Data Frames length

Data Frames Explained

R Factors

Create a factor Access factors Factor length

Factors Explained

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