plot1.R

if (!file.exists("./data/household_power_consumption.txt")) {
  download.file("http://j.mp/TbC79E", "./data/power_data.zip", method = "wget")
  unzip("./data/power_data.zip", overwrite = T, exdir = "./data")
}

datafile <- "./data/feb2007data.txt"
data <- read.table(datafile, sep = ";", header = T, na.strings = "?")


data$Datetime <- strptime(paste(data$Date, data$Time), "%d/%m/%Y %H:%M:%S")

library(datasets)


with(faithful, hist(data$Global_active_power, main = "Global Active Power", ylab = "Frequency", xlab = "Global Active Power (kilowatts)", col = "red", breaks = 13, ylim = c(0, 1200), xlim = c(0, 6), xaxp = c(0, 6, 3)))

dev.copy(png, file = "plot1.png")
dev.off()