R cheatsheet

x <- 0 						// assign value
help(func)	example(func)
list.files()	source("file.r")
c(1,2,3) 					// combine into vector
5:9 						// vector 5 to 9
seq(5,9,0.5)
						// array indexes start at 1
sentence[c(1, 3)]
names(ranks) <- c("first", "second", "third") 	// assign references
barplot(vector)
plot(x,y)
matrix(def_value, rows, cols)
dim(vector) <- c(2, 4)				// make matrix out of vector
matrix[x,y]

mean(vector)		median(vector)
abline(h = mean(limbs))

treasure <- data.frame(weights, prices, types)
treasure[["weights"]]
treasure$prices

read.csv(file)
read.table("infantry.txt", sep="\t", header = TRUE)
merge(x = aaa, y = bbb)
 plot(countries$GDP, countries$Piracy)
cor.test(countries$GDP, countries$Piracy)
	-> p-value pod 0.05 - statisticky signifikantni
line <- lm(countries$Piracy ~ countries$GDP)
abline(line)

install.packages("ggplot2")