Getting Started with R

Some Commands

Misc

data     <- read.table(filename,header=TRUE)           # Read tab or space delimited file with a header
csv_data <- read.table(filename,header=TRUE,sep=',')   # Read csv files with a header

v1       <- c(1,2,3,4,5,6,7)                           # Create a vector from these values
v2       <- c(1:10)                                    # Create a vector from 1 to 10
v3       <- c(v1,v2)                                   # Concatenate the vectors

matrix1  <- cbind(v1,v2)                               # Column bind into a 2 x n matrix

ls                                                     # List objects

Mean, SD, etc.

> sapply(h, length)
WList_Len 
     4599 
> sapply(h, mean)
WList_Len 
  15.6845 
> sapply(h, sd)
WList_Len 
 15.74873 
> 

Some Links

• http://www.statmethods.net/interface/workspace.html
• http://www.rstudio.com/ide/docs/using/history

• https://www.zoology.ubc.ca/~schluter/R/calculate/
• http://www.r-tutor.com/elementary-statistics/numerical-measures/mean
• http://stat.ethz.ch/R-manual/R-patched/library/stats/html/median.html
• http://www.cyclismo.org/tutorial/R/index.html
• http://answers.oreilly.com/topic/2597-how-to-compute-basic-statistics-with-r/
• http://grokbase.com/g/r/r-help

Personality Project

• http://www.personality-project.org/r/r.commands.html
• http://www.personality-project.org/r/r.guide.html
• http://personality-project.org/r/r.short.html
• http://www.personality-project.org/r/psych/HowTo/

Neil Gunther's 911 Help

See File:911r.pdf for the PDF.

# Emergency help for R newbies
# Created by NJG on Fri Aug 15, 2011
# Updated by NJG on Mon Jan  9  2012

# 1. Set YOUR path to this 911.r script in the following variable:

# LUNUX:   Command needs to gnome-open
# WINDOWS: C:\\You path\\ needs "\\" to esc '\' and '9' in 991.r
# MACOSX:  Put in explicit full path name
path911 <- "/Users/njg/Desktop//911/"

# 2. Now run this script in the R Console.
# It is assumed that Acrobat Reader is installed.

help.911 <- function() {
	ost <- "unknown"
	switch(Sys.info()[['sysname']],
		Darwin  = {
			ost <- "Mac OS X"
			cmd <- "open"
		},
		Linux = {
			ost <- "Linux"
			cmd <- "gnome-open"
		},
		Windows = {
			ost <- "Windows"
			cmd <- "open"
		}
	)
	if(ost == "unknown") { stop("Unknown operating system") }
	setwd(path911)
	t <- try(system(paste(cmd, "911r.pdf")))
	if(t != 0) { stop(sprintf("system() call problem running on %s system", ost)) }
}

# 3. Usage
cat("Type 'help.911()' at anytime at the R Console prompt\n")
cat("to open the 911r.pdf file in Acrobat Reader.\n")
cat("Like this:\n")
cat("> help.911()\n")

help.911()

Command History

files <- list.files(pattern="*.csv")
files

data <- lapply(files, read.table, sep=",", header=T)
data

stuff <- as.data.frame(do.call(rbind, data))
stuff

dim(stuff)


print(dframe)
print(stuff)

mean(stuff)
sd(stuff)

sapply(stuff, length)
sapply(stuff, mean)
sapply(stuff, sd)

getwd()
ls()
ls
options()
history()
history(max.show=Inf)