Thanks, Duncan. I tried axis(). It appears it allows you to add an axis, but does not say you can plot a second Y in the graph. Maybe I'm understanding it correctly. Any help will be appreciated!
Gary On Wed, May 9, 2012 at 7:26 AM, Duncan Murdoch <[email protected]>wrote: > On 08/05/2012 3:23 PM, Gary Dong wrote: > >> Dear R users, >> >> I'm plotting housing prices in City A over past 30 years in ggplot2. The >> Xs >> are years since 1980. I have two housing price variables: new home prices >> and old home prices, both of them measured by $/sqft. I have searched >> related threads on multiple Y axes in ggplot2 and I understand that >> multiple Y axes in different scales are not possible. I'm wondering if it >> is possible to have multiple Y axes with the same scale in ggplot2, like >> in >> my case. If still not possible, is there a easy way to do it in R's >> default >> plot function? Thanks. >> > > In base graphics, you can have as many axes as you like, displaying > anything. Use the axis() function. See ?axis for the arguments that > determine placement, ticks, etc. > > I would guess the same flexibility is there in ggplot2, but I don't know > how to do it. > > Duncan Murdoch > [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
