DATA MINING Desktop Survival Guide by Graham Williams
Desktop Survival Project Home List of Figures List of Tables Data Mining Introduction Data Mining with Rattle Data Exploring Data Transforming Data Cluster Analysis Association Analysis Classification and Regression Models Evaluation and Deployment Issues Moving into R Troubleshooting Beyond Rattle R Data Graphics in R Understanding Data Preparing Data Descriptive and Predictive Analytics Issues Evaluating Models Reporting Cluster Analysis Text Mining Text Mining Algorithms Bagging Bayes Classifier Cluster Analysis Conditional Trees Hierarchical Clustering K-Nearest Neighbours Linear Models Neural Networks Support Vector Machines Open Products AlphaMiner Borgelt Data Mining Suite KNime R Rattle Weka Closed Products C4.5 Clementine Equbits Foresight GhostMiner InductionEngine ODM Enterprise Miner Statistica Data Miner TreeNet Virtual Predict Appendicies Installing GTK, R, and Rattle Glossary Bibliography Index

Folders and Files

> getwd()			# Identify the current default working directory
> setwd("h:/work/")		# Change the current default working directory
> file.exists("filename")	# Returns TRUE if the file exists
> unlink("filename")            # Deletes the file or directory
> fname <- file.choose()        # An interactive file chooser.
> choose.dir()			# 
> dir <- tclvalue(tkchooseDirectory()) # GUI which requires library(tcltk).

List files in a folder in the order by modification time:

> lst <- file.info(dir())
> lst[order(lst$mtime),]

MS/Windows paths use the backward slash to separate components. This is a problem since the backslash is used as a standard mechanism for introducing special characters within strings. Thus, R requires a double back slash or will seamlessly allow the use of the forward slash. A useful utility on a MS/Windows environment, where backslashes are used in paths, and R likes to have forward slashes, is the following (Duncan Golicher, 5 Jan 2006, r-help):

setwd.clip <- function()
{
  options(warn=-1)
  setwd(gsub("\\\\", "/",readLines("clipboard")))
  options(warn=0)
  getwd()
}

Then, simply select a path into your clipboard (Ctrl-C), then in R call XnullXR functionsR functions (R function)R functionsR libraries (R library)R functionsR option (R option)R functionsR packages (R package)R functionsDatasets (Dataset)R functionsR functionssetwd.clip:

> dir <- setwd.clip()

R packages supply files and we can access them in a installation independent way using XnullXR functionsR functions (R function)R functionsR libraries (R library)R functionsR option (R option)R functionsR packages (R package)R functionsDatasets (Dataset)R functionsR functionssystem.file:

> system.file("csv", "audit.csv", package = "rattle")

We can view the contents of files in R using XnullXR functionsR functions (R function)R functionsR libraries (R library)R functionsR option (R option)R functionsR packages (R package)R functionsDatasets (Dataset)R functionsR functionsfile.show:

> file.show(system.file("csv", "audit.csv", package = "rattle"))

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