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.
Like Article
Suggest improvement
Share your thoughts in the comments
Please Login to comment...