R language Learning Note 001--reading CSV format data

read CSV format data

Data source is Southwestern University Siyakin Teacher's course assignment

Method One: Read.csv () function

1 file.choose () 2 read.csv ("c:\\users\\administrator\\desktop\\astocks.csv",3           head=t,sep=','5

Results

file.choose (): reads the file so that we know the specific path to the file.

File parameter : path and filename, Windows uses a backslash \ \

head=t: This is the first line, T indicates that the file has a title, and the first row in the file is the column name. If head=f, the original file is not

Title, add a line v1,v2, ... As the first line of the file, that is, the column name. The Read.csv () function defaults to head=t.

sep= ",": Delimiter problem, here the selection of separators will affect the input of the referenced string.

nrows=200: The number of rows problem, indicating that the first 200 lines of the file are read.

stringsasfactors = False : Character data is automatically converted to a factor when read, prevents conversion to a factor, and the parameter stringsasfactors = False,

Prevents the conversion of any factor in the imported data.

method Two: Read.table () function

1 a<-read.table ('c:\\users\\administrator\\desktop\\astocks.csv',  2               head=t,sep=','5, stringsasfactors = FALSE) 3 A

1 a[1:3,1:3]

Results

Slices: Select the number of rows and columns (choose between 1 and 3 rows and 1 to 3 columns)

R language Learning Note 001--reading CSV format data