Scan and Read Data from a File in R Programming – scan() Function
Last Updated :
30 Jun, 2020
scan()
function in R Language is used to scan and read data. It is usually used to read data into vector or list or from file in R Language.
Syntax:
scan(“data.txt”, what = “character”)
Parameter:
data.txt: Text file to be scanned
Returns: Scanned output
Example 1: Scanning of Text
data <- data.frame (x1 = c (1, 2, 2, 3),
x2 = c (4, 5, 6, 7),
x3 = c (8, 9, 10, 11))
data
write.table (data,
file = "data.txt" ,
row.names = FALSE )
getwd ()
data <- scan ( "data.txt" , what = "character" )
data
|
Output :
x1 x2 x3
1 1 4 8
2 2 5 9
3 2 6 10
4 3 7 11
[1] "/home/cg/root/8121844"
[1] "x1" "x2" "x3" "1" "4" "8" "2" "5" "9" "2" "6" "10" "3" "7" "11"
Read 15 items
Example 2: Scan data as text
data <- data.frame (x1 = c (1, 2, 2, 3),
x2 = c (4, 5, 6, 7),
x3 = c (8, 9, 10, 11))
data
write.table (data,
file = "data.txt" ,
row.names = FALSE )
data <- scan ( "data.txt" , what = list ( "" , "" , "" ))
data
|
Output:
x1 x2 x3
1 1 4 8
2 2 5 9
3 2 6 10
4 3 7 11
[[1]]
[1] "x1" "1" "2" "2" "3"
[[2]]
[1] "x2" "4" "5" "6" "7"
[[3]]
[1] "x3" "8" "9" "10" "11"
Read 5 records
Example 3: Skip lines with scan function
data <- data.frame (x1 = c (1, 2, 2, 3),
x2 = c (4, 5, 6, 7),
x3 = c (8, 9, 10, 11))
data
write.table (data,
file = "data.txt" ,
row.names = FALSE )
data <- scan ( "data.txt" , skip = 1)
data
|
Output:
x1 x2 x3
1 1 4 8
2 2 5 9
3 2 6 10
4 3 7 11
[1] 1 4 8 2 5 9 2 6 10 3 7 11
Read 12 items
Example 4: Scan Excel CSV File
data <- data.frame (x1 = c (1, 2, 2, 3),
x2 = c (4, 5, 6, 7),
x3 = c (8, 9, 10, 11))
data
write.table (data,
file = "data.csv" ,
row.names = FALSE )
data <- scan ( "data.csv" , what = "character" )
data
|
Output:
x1 x2 x3
x1 x2 x3
1 1 4 8
2 2 5 9
3 2 6 10
4 3 7 11
Read 15 items
[1] "x1" "x2" "x3" "1" "4" "8" "2" "5" "9" "2" "6" "10" "3" "7" "11"
Example 5: Read input from the keyboard.
z <- scan ()
1
2
3
4
print (z)
|
Output:
Read 4 items
[1] 1 2 3 4
Here, in the above code, the scan() function will take input from the user and print value using the print() function.
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