Why do you need the line to overlay the bars? Which bars are touched by the line is just a quirk of scaling and could easily change with the scales. All the overlay does is to make it harder to read, why not jut have 2 panels aligned on the x-axis but with the line plot above the bar plot?
-- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Mario Beolco > Sent: Tuesday, January 25, 2011 5:31 PM > To: r-help@r-project.org > Subject: [R] plot with 2 y axes > > Dear R users, > > apologies for the total beginner's question. I would like to create a > barchart for some temperature values with the y axis on the right hand > side of the plot. On this plot would like to overlay some time series > data (in the form of a line) for some other variable called Index. > The y axis for this latter variable should be on the left hand side of > the plot. > > An example of what I would like to obtain: > > https://sites.google.com/site/graphtests1/ > > I have tried to do this using ggplot2 and this where I have got (for > data see at the bottom of the e-mail): > > none<-theme_blank() > p<-ggplot(tmp3,aes(x=year,y=Temperature)) > p1<-p+geom_bar(stat="identity",fill="#9ACD32",colour="#000000") > p1 + geom_line(data=tmp3, aes(x=year, y=Index), > colour="black",size=1)+opts(legend.position="none",panel.grid.major=non > e,panel.grid.minor=none)+opts(panel.border=none)+theme_bw(base_size=20) > > This code does not do what I want because the Temperature y axis > should be on the left hand side and the the y axis for the other > variable called Index is not even there (should in theory be on the > left hand side). I also get the following warning message when I run > that code "I get Warning message:Stacking not well defined when ymin > != 0". (Should I worry about this?). > > I do not know whether ggplot2 can is the best package for creating the > type of plot that I want. I would, however, be very grateful for any > suggestions on to improve the above code or on how I could use other > packages to create the plot I want. > > thanks! > > Mario > > > > "year","Temperature","Index" > 1966,2.9,1 > 1967,4.5,1.24 > 1968,1.9,1.46 > 1969,1,1.37 > 1970,2.9,1.87 > 1971,4.3,2.66 > 1972,3.9,3.07 > 1973,4.3,3.91 > 1974,4.9,4.16 > 1975,4.4,4.32 > 1976,4.5,2.52 > 1977,2,2.44 > 1978,2.8,2.18 > 1979,-0.4,1.18 > 1980,2.3,1.93 > 1981,3,2.13 > 1982,0.3,1.92 > 1983,1.7,2.24 > 1984,3.3,2.01 > 1985,0.8,1.89 > 1986,-1.1,0.66 > 1987,0.8,1.01 > 1988,4.9,1.5 > 1989,5.2,2.11 > 1990,4.9,2.02 > 1991,1.5,0.7 > 1992,3.7,0.75 > 1993,3.6,1.28 > 1994,3.2,1.37 > 1995,4.8,2.01 > 1996,2.3,1.54 > 1997,2.5,2 > 1998,5.2,2.07 > 1999,5.3,2.11 > 2000,4.9,2.42 > 2001,3.2,2.29 > 2002,3.6,2.15 > 2003,3.9,2.21 > 2004,4.8,2.14 > 2005,4.3,2.33 > 2006,3.7,1.89 > 2007,5.8,2.03 > 2008,4.9,2.58 > > ______________________________________________ > R-help@r-project.org 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. ______________________________________________ R-help@r-project.org 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.
