plot3

plot3.R

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+temp <- tempfile()
+download.file('http://d396qusza40orc.cloudfront.net/exdata%2Fdata%2Fhousehold_power_consumption.zip',temp)
+all_data<-read.csv(unzip(temp),sep = ";",header = T,quote = "",na.strings='?')
+unlink(temp)
+my_data<-subset(all_data,Date=='1/2/2007' | Date=='2/2/2007')
+my_data$dt<-strptime(paste(my_data$Date,my_data$Time),"%d/%m/%Y %T")
+png('plot3.png',bg = "transparent")
+plot(my_data$dt,my_data$Sub_metering_1,ylab='Energy Submetering',xlab='',t='n')
+lines(my_data$dt,my_data$Sub_metering_1,col='black')
+lines(my_data$dt,my_data$Sub_metering_2,col='red')
+lines(my_data$dt,my_data$Sub_metering_3,col='blue')
+legend('topright',col=c("black","red","blue"),legend = c("Sub_metering_1","Sub_metering_2","Sub_metering_3"),lwd=1)
+dev.off()