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rexportpostscriptmogrify

R: Postscript export filename extension on Mac OS X and incorporating mogrify into R

I am plotting several graphics in R in a loop and export them as a postscript using postscript().

for(i in 1:length(ind)){
  postscript(names(ind[i]))
  par(mar=c(6,8,6,5))
  plot(ind[[i]][,c('YEAR','VALUE')],
       type='b',
       main=ind[[i]][1,'NAME'],
       xlab="Time [Years]", 
       ylab="Value [mm]")

dev.off()
}

This works all fine but when I have a look at the files in Finder no file extension (e.g .ps) is written to them (I am on Mac OS X 10.8.5). As I want to further process and convert the output images with ImageMagick's mogrify I rely on the file extension. Does anyone have a solution for that? When only plotting one file with postscript() then you specify the filename and the extension but how could this be done in a loop?

Another question: is it possible to incorporate command line tools such as mogrify (http://www.imagemagick.org/script/mogrify.php) into R so that it could be executed from there (a Windows AND Mac solution would be best)?

Solution

  • You could add an extension by paste(names(ind[i]), ".ps", sep = ""). If you want to use command line tools, use shell or system.