Call plot() from an R script and get the graph in the output file?

Question

I have created an R script that reads certain data from a file, calls the summary() method and then the plot() method.

But when I try to run the R script where the commands below are written, in the output file I get the summary, but not the graph.

When I run the following instructions in R manually, everything works perfectly, and I get both the summary and the graph.

Is there a way to get the graph in the output file?

m0<-read.csv(file="Myfile", head=FALSE, sep",")
var_m0<-c(m0$ V3)
summary(var_m0)
plot(var_m0)

Thanks!

Answer 1

You need to tell R what kind of output you want and where you want it to go. Take a look at ?png for a fairly comprehensive list. And don't forget dev.off() after your plot() call!

m0 <- read.csv(file="Myfile", head=FALSE, sep",")
var_m0 <- c(m0$ V3)
summary(var_m0)

png('plot.png')
plot(var_m0)
dev.off()

If you specifically want the graph in the same output file as the rest of the code, you can look at knitr and sweave.