ExData_Plotting1/plot2.R at master · blue-055/ExData_Plotting1 · GitHub

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setwd("~/ExData_Plotting1")

downloadURL <- "https://d396qusza40orc.cloudfront.net/exdata%2Fdata%2Fhousehold_power_consumption.zip"

if (!dir.exists("Data")) {
  dir.create("Data")
}

downloadFile <- "./Data/household_power_consumption.zip"
householdFile <- "./Data/household_power_consumption.txt"

if (!file.exists(householdFile)) {
  download.file(downloadURL, downloadFile, method = "curl", mode = "wb")
  unzip(downloadFile, overwrite = TRUE, exdir = "./Data")
}

plotData <- read.table(
  householdFile,
  header = TRUE,
  sep = ";",
  na.strings = "?",
  stringsAsFactors = FALSE
)

finalData <- plotData[plotData$Date %in% c("1/2/2007", "2/2/2007"), ]

SetTime <- strptime(
  paste(finalData$Date, finalData$Time, sep = " "),
  "%d/%m/%Y %H:%M:%S"
)

finalData <- cbind(SetTime, finalData)


plot(finalData$SetTime, finalData$Global_active_power, type="l", col="black", xlab="", ylab="Global Active Power (kilowatts)")
png("plot2.png", width = 480, height = 480)

plot(
  finalData$SetTime,
  finalData$Global_active_power,
  type = "l",
  col = "black",
  xlab = "",
  ylab = "Global Active Power (kilowatts)"
)

dev.off()

file.exists("plot2.png")