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# Introduction to R: Glossary - Introduction to R for metagenomics

## Key Points

 First Steps on R R is a programming language RStudio is a useful tool for script writing and data-management. A variable can temporarily store data. R Data Types R uses different types of data to store information. Data Frame Manipulation Data-frames contain multiple columns with different types of data. Making Graphs with ggplot2 The library `ggplot2` creates plots that help/remarks the data analysis. Creativity is welcome to explore and present your data. Libraries in R allow us to have sets of functions specialized in a global purpose. Finding Help on R Help `?` shows useful information about the functions you inquire.

## Glossary - Introduction to R for metagenomics

class
Represents the set of properties or methods that are common to all objects of one type
command
An instruction telling a computer program to perform a specific task.
comment
Text written in a script that is not treated as code to be run, but rather as text that describes what the code is doing. These are usually short notes, often beginning with a # (in many programming languages, R included)
data frame
A two-dimensional data structure for storing tabular data in memory. Rows represent records and columns represent variables(vectors).
double
Short for “double-precision floating-point number”, meaning a 64-bit numeric value with a fractional part and an exponent.
integer
A number that can be written without a fractional component
list
A vector that can contain values of many different (heterogeneous) types.
mock data
fictional data which is artificially inserted into a piece of software.
nautical chart
A map that depicts the configuration of the shoreline and seafloor.It provides water depths, locations of dangers to navigation, locations and characteristics of aids to navigation, anchorages, and other features. It was widely used by mariners!
Nikolai Medtner
Russian composer and pianis. Listen to some of his compositions
object
A data structure that has some methods and attributes.
operator
A symbol that tells the programm to perform specific mathematical, relational or logical operation and produce final result
output
The result given by the program to the user.
R (Programming language)
A popular open-source programming language used primarily for data science.