Plotting and saving R graph

Question

I have a bash script that tracks memory usage over time as a command is run. It spawns the desired command and then writes a log with column1 = "memory in use by program (gigs)" and column 2 is the time elapsed so far in seconds. e.g. ``` 31.282 1470 31.565 1480 31.848 1490 31.989 1500 32.273 1510 32.414 1520 32.697 1530 32.980 1540 33.122 1550 33.405 1560 6.511 1570 6.935 1580 7.502 1590 7.926 1600 8.351 1610 8.775 1620 9.059 1630 9.483 1640 9.908 1650 10.333 1660 ``` What I want to do is wait until the process is complete and then use R to plot a graph of memory usage over time and save it in the current directory. I was playing around with R and I know exactly what commands I need to use: ``` > heisenberg <- read.csv(file="4644.log",head=FALSE,sep=" ") > plot(heisenberg$V2,heisenberg$V1,type="o",col="red",main="Memory Usage Over Time",xlab="Time (seconds)",ylab="Memory (gigabytes)") > text(max(heisenberg$V2),max(heisenberg$V1),max(heisenberg$V1)) #Displays max value ``` But the par…

Accepted Answer

Wrap your plot calls in:

```
jpeg("myplot.jpg")
....plot code here....
dev.off()
```

or

```
png("myplot.png")
....plot code here....
dev.off()
```

See their respective help pages: `?png` for details of other arguments.

For a PNG this would be:

```
png("my_plot.png", height = 800, width = 600)
plot(heisenberg$V2,heisenberg$V1,type="o",col="red",main="Memory Usage Over Time",xlab="Time (seconds)",ylab="Memory (gigabytes)")
text(max(heisenberg$V2),max(heisenberg$V1),max(heisenberg$V1)) #Displays max value
dev.off()
```

As for running this in a bash script, you need to invoke R to run your script containing the R code to load the data and draw the plots. For this there are several options, two are:

```
R CMD BATCH --no-save --no-restore my_script.R
```

or use `Rscript`

```
Rscript my_script.R
```

where `my_script.R` is a text file containing syntactically-valid R code required to produce the plots.

Plotting and saving R graph

Solution

Problem