ExData_Plotting1/plot4.R at master · davidemandrini/ExData_Plotting1 · GitHub

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plot4 <- function(pathToDataFile) {
    data <- readData(pathToDataFile)
    png(file = "plot4.PNG")
    par(mfcol = c(2, 2))

    # first graph
    plot(data$Global_active_power, main = NULL,
         ylab = "Global Active Power", xlab = "",
         col = "black", type = "n", axes = FALSE, frame = TRUE)
    lines(data$Global_active_power)
    axis(side = 1, labels = c("Thu", "Fri", "Sat"),
         at = c(1, floor(nrow(data)/2), nrow(data)))
    axis(2)

    #second graph
    plot(data$Sub_metering_1, main = NULL,
         ylab = "Energy sub metering", xlab = "",
         col = "black", type = "n", axes = FALSE, frame = TRUE)
    lines(data$Sub_metering_1, col = "black")
    lines(data$Sub_metering_2, col = "red")
    lines(data$Sub_metering_3, col = "blue")
    axis(side = 1, labels = c("Thu", "Fri", "Sat"),
         at = c(1, floor(nrow(data)/2), nrow(data)))
    axis(2)
    legend("topright", lwd = 1, col = c("black", "red", "blue"),
           legend = c("Sub_metering_1", "Sub_metering_2", "Sub_metering_3"),
           bty = "n")

    #third graph
    plot(data$Voltage, main = NULL,
         ylab = "Voltage", xlab = "datetime",
         col = "black", type = "n", axes = FALSE, frame = TRUE)
    lines(data$Voltage)
    axis(side = 1, labels = c("Thu", "Fri", "Sat"),
         at = c(1, floor(nrow(data)/2), nrow(data)))
    axis(2)

    #forth graph
    plot(data$Global_reactive_power, main = NULL,
         ylab = "Global_reactive_power", xlab = "datetime",
         col = "black", type = "n", axes = FALSE, frame = TRUE)
    lines(data$Global_reactive_power)
    axis(side = 1, labels = c("Thu", "Fri", "Sat"),
         at = c(1, floor(nrow(data)/2), nrow(data)))
    axis(2)


    dev.off()
}

readData <- function(pathToDataFile) {
    completeFileName = paste0(pathToDataFile, "/household_power_consumption.txt")
    fullData <- read.csv(completeFileName, sep = ";",
                         na.strings = "?",
                         colClasses=c(rep("character",2), rep("numeric",7)))
    fullData$Date = as.Date(fullData$Date, format = "%d/%m/%Y")
    myData <- subset(fullData, Date >= "2007-02-01" & Date <= "2007-02-02" )
    myData
}