Question

If I want to save a plot to a PDF file, which of the following is a correct way of doing that?

(a) Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf()

(b) Construct the plot on the PNG device with png(), then copy it to a PDF with dev.copy2pdf()

(c) Open the PostScript device with postscript(), construct the plot, then close the device with dev.off()

(d) Open the screen device with quartz(), construct the plot, and then close the device with dev.off()

I have been asked this question in a job interview.

Question is from Exploratory Data Analysis topic in division Profiling, Simulation and Data Analysis of R Programming

Answer 1

Correct option is (a) Construct the plot on the screen device and then copy it to a PDF file with dev.copy2pdf()

Explanation: With the par( ) function, you can include the option mfrow=c(nrows, ncols) to create a matrix of nrows x ncols plots that are filled in by row.