Gain insights into R, the leading language for data analysis. Learn about its basics, advanced concepts, and practical coding to drive valuable insights from large datasets.

The digital world we live in has given companies and people access to staggering amounts of data, and anyone that can make use of that to drive valuable insights stands to benefit. The ability to work with large amounts of data is becoming a standard requirement for countless jobs across multiple industries.

Enter R, probably the most well-known language for data analysis. It's been used for years due to its robust statistical functionality, outstanding graphing ability, and extensibility through packages.

This interactive course will get you up to speed and assumes no prior knowledge of R. You'll start with the very basics and work your way up to advanced concepts like exception handling. By the time you're done, you'll be able to write detailed, useful code in R yourself.

Learn R from Scratch

ans <- 4 * 9
ans <- ans + 2
ans <- ans - 8
cat(ans)

### Explanation
The given task here was to find the value of the equation
```
2 + 4 * 9 - 8
```
Mathematically, we need to find the value of the multiplying numbers first, keeping in mind **operator precedence**. So, we multiply $4$ and $9$ and save the value in the variable `ans`. Next, we perform addition. We can either perform subtraction or addition first, but we move from left to right: add $2$ to `ans` and store in `ans`, then, subtract $8$ from `ans`.

> Operator precedence determines which operator is performed first in an expression with more than one operators.

* `*`, `/` and `%` operators have equal precedence.
* `+` and `-` operators have equal precedence.
* `*`, `/` and `%` have higher precedence than `+` and `-`.
The operator with higher precedence is executed first in the expression.

## Solution #2: Using the Entire Expression Directly

### Explanation
This is the simpler method, just find the value of the entire string and pass to `cat()` for printing.
Here, **operator precedence** will be handled by R compiler itself. 

## Explanation
The given task here was to find the value of the equation
```
2 + 4 * 9 - 8
```
Mathematically, we need to find the value of the multiplying numbers first, keeping in mind **operator precedence**. So, we multiply $4$ and $9$ and save the value in the variable `ans`. Next, we perform addition. We can either perform subtraction or addition first, but we move from left to right: add $2$ to `ans` and store in `ans`, then, subtract $8$ from `ans`.

> Operator precedence determines which operator is performed first in an expression with more than one operators.

* `*`, `/` and `%` operators have equal precedence.
* `+` and `-` operators have equal precedence.
* `*`, `/` and `%` have higher precedence than `+` and `-`.
The operator with higher precedence is executed first in the expression.

# Solution #2: Using the Entire Expression Directly

## Explanation
This is the simpler method, just find the value of the entire string and pass to `cat()` for printing.
Here, **operator precedence** will be handled by R compiler itself. 

In this review: we give a detailed analysis of the solution to this exercise.

Getting Started

Variables

Exploring R Objects

R Operators and Notation

Conditional Statements

Loops

Functions

Input/Output

Exception Handling

Classes

Fun Challenges

Conclusion

Solution Review: Arithmetic Operators

Solution #1: Operator Precedence

Explanation

Solution #2: Using the Entire Expression Directly

Explanation