U09_ReadData

R Markdown

http://rmarkdown.rstudio.com. Knit includes both content as well as the output

U09: 檔案資料輸入與輸出

檔案資料輸入與輸出

設定工作目錄

rm( list = ls() )
ls()

## character(0)

mywd <- "H:/DataR"

setwd( mywd )

getwd( )

## [1] "H:/DataR"

資料儲存 – dump, source

儲存物件的名稱與其值（內容）

x <- 1:10
y <- matrix( 1:6, nrow = 2, ncol = 3 )

x

##  [1]  1  2  3  4  5  6  7  8  9 10

y

##      [,1] [,2] [,3]
## [1,]    1    3    5
## [2,]    2    4    6

ls()

## [1] "mywd" "x"    "y"

dump some data/command into a file

ls()

## [1] "mywd" "x"    "y"

dump( c("x", "y"), file = "mydump.txt")
ls()

## [1] "mywd" "x"    "y"

remove the variables

rm(x); rm(y)
ls()

## [1] "mywd"

read the content

source( file = "mydump.txt" )
ls()

## [1] "mywd" "x"    "y"

資料儲存 – dput, dget

儲存物件的值（內容）

x <- 1:10
y <- matrix( 1:6, nrow = 2, ncol = 3 )

x

##  [1]  1  2  3  4  5  6  7  8  9 10

y

##      [,1] [,2] [,3]
## [1,]    1    3    5
## [2,]    2    4    6

dput( y, file = "mydput.txt" )