R软件语句(国外英文资料).doc

R软件语句(国外英文资料) File management main functions: Setwd () : set the current working directory for R software. Getwd () : view the current working directory of R software. List.files () : view the file in the current directory. File.show () : displays the file. File. Access () : see if the file is readable. File. Create () : create a file. For example: file.create ( D: / lesong-.xls ). Dir. Create () : create a directory. For example: dir. Create (D: / lesong). File. Remove () : delete a file. File. Choose () : select a File. Read the data function read.table () main parameters: The word file, header = FALSE, , Dec = , , row.names, col.. As is =! StringsAsFactors, Na. Strings = na, colClasses = na, nrows = -1, Skip = 0, check. Blank. Lines. The skip, White = FALSE, blank. Lines. Comment. Char = #, AllowEscapes = FALSE, flush = FALSE, StringsAsFactors = default.stringsasfactors () FileEncoding = , encoding = unknown ) Header: logical parameters. Specifies whether the file first action variable name is specified. Na. Strings: specifies the missing text. Skip: specifies the number of rows to be skipped. Nrows: specifies the maximum number of rows to read. Dec: specifies the decimal mark. Sep: specifies the data segmentation characters. Row. Names and col. Names: assign data row names and column names. Read the other related functions of the data: ReadLines () : read the data file in line. Similar to perl reading data. Scan () : read the data as a one-line vector form. Read.delim ( educ_scores. TXT ) : read in the text file (TAB delimiter). Read CSV ( educ_scores1.csv ) : read in CSV (comma split). ReadBin () : read binary data. ReadChar () : read in character data. Attach () : links the data box variables to memory. General graph function plot () main parameter interpretation: Plot (x, y = NULL, type = p, xlim = NULL, ylim = NULL, Log = , main = NULL, sub = NULL, xlab = NULL, ylab = NULL, Ann = par ( Ann ), axes = TRUE, frame. Plot = axes, Panel. First = NULL, pane.l