Basics in R Flashcards
1
Q
Simple calculations
A
> 5 + 3
2
Q
Variable assignment
A
> age < - 28
3
Q
Using existing functions for calculations
A
> sqrt (225)
4
Q
Creating a vector
A
> weekly_sales < - c(200, 120, 130, 125, 220)
5
Q
Getting information out of a vector
A
> weekly_sales{3}
> weekly_sales{weekly_sales > 180}
6
Q
Installing packages
A
> install.packages(“somepackage”)
7
Q
Loading packages
A
> library(“somepackage”)
8
Q
Setting working directory
A
> setwd(“~/myDirectory”)
To get the symbol, Alt 126
9
Q
Reading a csv file
A
> data < - read.csv(“somedata.csv”)
10
Q
Get the structure of the object
A
> str(data)
11
Q
Get the head of the object
A
> head(data)
12
Q
Get the names of the object
A
> names(data)
13
Q
Get the entire object
A
> data
14
Q
Calculate the mean of a variable
A
> mean(data$someVariable)
15
Q
Calculate the median of a variable
A
> median(data$someVariable)
