DataTechNotes: Basic operations in R

Basic operations in R

Here are some basic operations in R, you may try it in R console.

# this is a comment

# comment starts with # mark

> 32*4

[1] 128

> 10/21
[1] 0.4761905

> b<-4.5      # to write b=4.5, b<-4.5 or b=4.5 can be used
> b
[1] 4.5

> a=10
> print(a)    # prints object
[1] 10

> cat(a)      # this also can be used to print
10
> pi          # pi 
[1] 3.141593

Installing packages

To use a library in R, first we need to install it. Below command shows how to install 'tidyr' library.

> install.packages("tidyr")

The target library needs to be included in the script. To load library 'library' or 'require' command can be used.

library(tidyr)    # loads tidyr package

requare(dplyr)    # loads dplyr package

Getting a help

>help(dir)        # shows help page for dir command

>?dir             # shows the same

>example(file)    # shows file command examples

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