filename = "/home/gabor/Dropbox/Weizmann/R/iris_dataset.txt"
# setwd - set working directory
# getcwd - get working directory
ir = read.table(filename, sep="\t", header=T)
head(ir, 3)
tail(ir, 3)
View(ir) # Capital V !!! (opens a separate view of the data)
class(ir) # data.frame
dim(ir) # 150 5 dimensions: (rows, columns)
ir[2, 3]
head(ir)
# The indexes on the left hand side are also called "row-names"
ir[,1] # access a column by its location
ir$seplen # access a column by its name
ir1 = ir[, c("seplen", "sepwid")] # dataframe
head(ir1)
column = ir[, c("seplen")] # numberic vector
summary(ir)