View source for Importing and Exporting in R

==Importing and exporting  data in '''R'''==
'''R''' allows data importing from many different source formats. The 
most common used functions to import data are the ''read'' 
functions. The following code can be used to import a .csv table named 
"forest-data.csv" from the folder "my-working-folder". The data is 
stored in an object named ''data''.

data <- read.csv("C:/Program Files/... /my-working-folder/forest-data.csv")

Note that ''/'' or ''\\'' instead of ''\'' is used in '''R''' to define the the file path in 
your computer.

A more convenient way of working is defining first the working directory 
from where the data will be imported and where the result can be stored. 
The actual working directory can be consulted by ''getwd()'', and the 
objects contained there by ''dir()''. The working directory can be 
defined as described below.

setwd("D:/Data/... /R-course/")

Once defined the working directory, the file can be imported without 
specifying the file path as follows:

data <- read.csv("forest-data.csv")

All the objects created or imported to '''R''' are temporary stored 
in the '''R'''-workspace. Objects in the workspace can be removed by 
using the ''rm()'' function. All objects in the workspace are usually 
lost after finishing the '''R''' session. The easiest option to store 
permanently an object in the working directory is by using the ''write()'' functions. The code to save as a .csv file the object ''d'' 
is shown below.

write.csv(d, "Data-saved.csv")