[R] Question on qplot

[RON70]

Hi, suppose I have following codes :

library(zoo); library(ggplot2)
dat <- matrix(rnorm(500*2), 500); dat <- zooreg(dat, start =
as.Date("01/01/01", "%m/%d/%y"), frequency=1); plot(dat)
head(dat); month.no <- format(index(dat), "%m"); dat1 <-
cbind(coredata(dat), as.numeric(month.no))

x <- dat1[,1]; y <- dat1[,2]; z <- dat1[,3]


Now I draw a qplot like :
qplot(x, z)

It is ok........
However if I reverse that like
qplot(z, x)
I am getting strange plot. I expected it should look just like transpose of
above plot.

Can anyone please clarify me why I am getting that? 

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