forked from rdpeng/ExData_Plotting1
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Plot3.R
44 lines (34 loc) · 1.26 KB
/
Plot3.R
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Plot3<-function(){
##
## Reads the subset file created using readData.R and creates Plot3.png
##
## read the file
##
dt<-read.csv("dataSubset.csv")
## convert the col ntime to POSIXlt class
##
dt$ntime<-strptime(dt$ntime, format("%Y-%m-%d %H:%M:%S"))
## change the locale to print the week days in english
##
actLC<-Sys.getlocale("LC_TIME")
Sys.setlocale("LC_TIME", "English")
## open the png graphic device
##
png(file = "Plot3.png", width = 480, height = 480)
## plot the axes of the graphic without data
##
plot(dt$ntime, dt$Sub_metering_1, type="n",ylab="Energy sub metering (watt-hour)", xlab="")
## add the lines with different colours
##
lines(dt$ntime, dt$Sub_metering_1, col="black")
lines(dt$ntime, dt$Sub_metering_2, col="red")
lines(dt$ntime, dt$Sub_metering_3, col="blue")
## print the legend using the cols names
##
legend("topright", lty = 1, col = c("black", "red", "blue"), legend = names(dt[6:8]))
## change the locale to default
##
Sys.setlocale("LC_TIME", actLC)
## close the PNG device
dev.off()
}