Programming in r
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Programming in R. Getting data into R. Importing data into R. In this session we will learn: Some basic R commands How to enter data directly into R How to use commands to read data from CSV files, tab delimited files, and fixed field files. R Data type.

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Programming in R

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Programming in r

Programming in R

Getting data into R


Importing data into r

Importing data into R

In this session we will learn:

  • Some basic R commands

  • How to enter data directly into R

  • How to use commands to read data from CSV files, tab delimited files, and fixed field files.


R data type

R Data type

  • Vectors – a single column (or row )of data

    • Example – a numeric vector containing test scores of students

  • Matrix – a collection of vectors but must all be of the same data type

  • Data frame – a special matrix that can contain both numeric and character columns.


R commands

R commands

  • c() – creates a column vector

  • print – prints the contents of an object

  • read.csv – reads in a CSV file

  • read.table – more generic function that can read in files with any delimiter, such as tab delimited.

  • read.fwf– reads in fixed record formats.


Creating data in r

Creating Data in R

  • The easiest way to add data to R is to code it.

names <- c("Bob","Gene","Valerie")

print(names)

age <- c(30, 40, 19)

hometown <- c("Dallas, TX", "Little Rock, AR", "Dayton, OH")

print(hometown)


Importing data into r1

Importing Data Into R

  • In order to import data into R, we need to know how the file was created.

    • Excel file

    • SAS

    • SPSS

    • Delimited

    • Fixed-field or fixed record.


Importing data into r2

Importing Data Into R

  • Base R cannot import data directly from Excel.

    • There are packages available that allow R to import directly from Excel.

    • We will learn about packages in the next session.


Importing excel

Importing Excel

  • Need to save Excel as a CSV file.

    • Click File/Save As

    • On the next GUI, select CSV from the Save as type.

    • We will demonstrate it in a few minutes.


Csv file

CSV File


Importing csv file

Importing CSV file

#~~~~~~~~~~~~~~~~~~~~~~~~#

# code chunk 2 #

# Import CSV File #

#~~~~~~~~~~~~~~~~~~~~~~~~#

widge <- read.csv("C:\\Path here\\WidgeOne.csv")

head(widge)


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