This is a draft cheat sheet. It is a work in progress and is not finished yet.
Arithmetic
+ |
Addition |
- |
Subtraction |
* |
Multiplication |
/ |
Division |
^ |
Exponentiation |
%% |
Modulo |
Variable Assignment
my_var <- 4 |
To store a value (e.g. 4) or an object (e.g. a function description) in R then later use this variable's name to easily access the value or the object that is stored within this variable. |
Basic Data Types
Numerics |
Decimals values like 4.5 and 4 |
Integers |
Natural numbers like 4 |
Logical |
Boolean values (TRUE or FALSE) |
Characters |
Text (or string) values |
class() |
To check the data type of a variable |
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Selection by Comparison
< |
Less than |
> |
Greater than |
<= |
Less than or Equal to |
>= |
Greater than or Equal to |
== |
Equal to each other |
!= |
Not equal to each other |
Vectors
Vectors are one-dimension arrays that can hold numeric data, character data, or logical data. |
In other words, a vector is a simple tool to store data. |
Vector Functions
c() |
Create a vector |
names() |
Give a name to the elements of a vector |
sum() |
Calculates the sum of all elements of a vector |
[] |
Select specific elements of a vector |
[c( , )] OR [c( : )] |
Select multiple elements from a vector |
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