Update cheatsheet

Author: mblue9

cheatsheet.Rmd

@@ -2,18 +2,18 @@
 title: "Introduction to R for Biologists cheatsheet"
 author: "Maria Doyle"
 date: "`r format(Sys.time(), '%d %B %Y')`"
-output: 
+output:
   html_notebook:
     toc: yes
-    toc_float: yes
     toc_depth: 4
+    toc_float: yes
 subtitle: glossary of vocabulary used in the course
 ---
 
 ## Packages
 
 **dplyr**  
-tidyverse package for manipulating data, contains the `mutate()` and `filter()` functions and the `%>%` operator
+tidyverse package for manipulating data, contains the `mutate()`, `filter()`, `select()`, `full_join()` functions and the `%>%` operator
 
 **ggplot2**  
 tidyverse package for data visualisation 
@@ -57,12 +57,15 @@ convert values to factor data type (from base R)
 **`filter()`**  
 choose rows (from dplyr)
 
-**`full_join()`**
+**`full_join()`**  
 joins 2 tables returning all rows and all columns from both tables.
 
 **`gather()`**  
 function that enables converting from wide to long (tidy) format (from dplyr)
 
+**`getwd()`**  
+find out what the working directory is (get working directory)
+
 **`ggplot()`**  
 function used to create a ggplot (from ggplot2)
 
@@ -96,6 +99,9 @@ read a comma-separated file into R (from readr)
 **`read_tsv()`**  
 read a tab-separated file into R (from readr)
 
+**`select()`**  
+choose columns (from dplyr)
+
 **`str()`**  
 showing the structure of an object (from base R). Useful for checking data types.
 
@@ -113,7 +119,7 @@ invoke a spreadsheet-like viewer on an R object (from base R)
 
 ## Terms
 
-**argument**
+**argument**  
 an input to a function
 
 **assignment operator**  
@@ -128,7 +134,7 @@ a window where you can interactively type in commands and the output is returned
 **double**  
 a data type in R, used to represent numbers containing a decimal point (integer is the data type for numbers without decimal point)
 
-**factor**
+**factor**  
 a data type in R, used to represent categories
 
 **function**   
@@ -140,7 +146,7 @@ type of ggplot e.g. `geom_line()`, `geom_point()`, `geom_jitter()`, `geom_boxplo
 **object**  
 everything in R is an object. The assignment operator `<-` can be used to create objects. Note that what R calls objects are called variables in other languages such as Python.
 
-**package**
+**package**  
 a package is a collection of functions and usually includes code, documentation, tests and example datasets.
 
 **pipe**  
@@ -155,7 +161,7 @@ a text file containing commands, in R a script filename ends with .R
 **themes**  
 the non-data components of a ggplot e.g. background, grid lines, font size and font type
 
-**working directory**
+**working directory**  
 the location (path) where R looks to read in data and save files
 
 \