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plot4.R
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plot4.R
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source('load_data.R')
data <- loadData()
png(filename='plot4.png', width=480, height=480, units='px')
par(mfrow=c(2,2))
startDay = as.POSIXct(strftime("2007-02-01 00:00:00"))
endDay = as.POSIXct(strftime("2007-02-03 00:00:00"))
plot(data$Time,
data$Global_active_power,
xlim=c(startDay, endDay),
xaxt="n",
type="l",
xlab="",
ylab="Global Active Power"
)
axis.POSIXct(1, at=seq(startDay, endDay, by="day"), format="%a")
plot(data$Time,
data$Voltage,
xlim=c(startDay, endDay),
xaxt="n",
type="l",
xlab="datetime",
ylab="Voltage"
)
axis.POSIXct(1, at=seq(startDay, endDay, by="day"), format="%a")
plot(data$Time,
data$Sub_metering_1,
xlim=c(startDay, endDay),
xaxt="n",
type="l",
xlab="",
ylab="Energy sub metering"
)
lines(data$Time, data$Sub_metering_2, col="red")
lines(data$Time, data$Sub_metering_3, col="blue")
axis.POSIXct(1, at=seq(startDay, endDay, by="day"), format="%a")
legend("topright",
legend=c('Sub_metering_1', 'Sub_metering_2', 'Sub_metering_3'),
col=c('black', 'red', 'blue'), lty=c(1, 1, 1))
plot(data$Time,
data$Global_reactive_power,
xlim=c(startDay, endDay),
xaxt="n",
type="l",
xlab="datetime",
ylab="Global_reactive_power"
)
axis.POSIXct(1, at=seq(startDay, endDay, by="day"), format="%a")
dev.off()