Introduction to R - theory sessions: Cheatsheets for Queuing System Quick Reference

R and RStudio are not the same thing. RStudio is an IDE that provides you with a convenient way to manage R projects and R is the underlying language that enables RStudio.

You will not learn everything about R or RStudio in a day, there are a huge number of tools available to you in RStudio. The more time you commit to exploring and practicing the more you will achieve.

Project management is a vital part of ensuring that you are producing maintainable, sharable, and robust software.

You will get stuck at some point, needing help is a case of when not if.

Help is available, but it is important you have done your due diligence and are asking for help in the correct places and in the correct format.

PEDMAS

Use in-built functions, you don’t need to reinvent the wheel.

When naming variables it’s important be consistent and succinct

Output assignment has to be explicit to keep the result of an operation

Different data types can require different operations

R will make assumptions about data types unless you are explicit

Vectors can only hold a single data type

Vectorisation allows us to apply operations to all the variables in a vector

Vectors can be indexed by multiple methods to retrieve/manipulate the specific information you desire

Flow control is an important technique you need to learn to create useful software

Whenever possible simplicity is the best option

Plan & refactor

Functions can help reduce redundancy and increase reusability in your code

Data frames are lists of vectors.

Data frames are the most common way of storing tabular data

The complexity of the process is related to the complexity of the conditions for retrieving the data you want.

Loading in the data is just the first step

There are many packages with a wide range of features, becoming adept at utilising packages is key to getting the most out of R

Plotting is useful tool for understanding our data it is not just for results visualisation

Solving problems with R and RStudio will improve your skills and confidence

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