[R] how to put barchart and line chart in the same plot in ggplot2

[xin wei]

dear userR:
I am trying to plot two dependent variables in the same plot in ggplot2.
because these two variables have very different magnitude, I have to use a
second Y axis. I hope one variable to be line and the other to be barchart.
The x axis is continuous. Yet since I have to make barchart, I guess I have
to treat it as discrete or categorical.
I have been google searching for the whole afternoon but do not have any
clue. 
Can anyone give me a direction (not have to be a complete answer...)?

many thanks



--
View this message in context: http://r.789695.n4.nabble.com/how-to-put-barchart-and-line-chart-in-the-same-plot-in-ggplot2-tp4639194.html
Sent from the R help mailing list archive at Nabble.com.