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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

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.
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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