[R] Creating pdfs using qplot in qqplot2

[Bos, Roger]

I am trying to create plots within a for loop and output them to a pdf.
Here is a working example using plot:

          gg <- data.frame(datadate=1:4, spread=5:8)
          pdf()
          for (i in 1:3) {
              plot(gg$datadate, gg$spread, main=i)
          }
          dev.off()

I am trying to learn more about ggplot2 so I try a slight modification
and it doesn't work.  Anyone know how to do this using qplot in ggplot2?


     	   gg <- data.frame(datadate=1:4, spread=5:8)
          pdf()
          for (i in 1:3) {
              qplot(gg$datadate, gg$spread, geom="line", main=i)
          }
          dev.off()

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