[R] different data series on one graph

Anne York york at noaa.gov
Wed May 1 16:24:28 CEST 2002

Here is a function that can be easily modified for your purposes. 

Example of usage:

 x2 <- 0:12
 y1 <- x1^2
 y2 <- x2+3


"plot.double" <- function(x1, y1, x2, y2, type1 = "l",type2="l", xlim =
         NULL,   main = NULL, xlab = NULL,lty1=1,lty2=2,pch2=16,pch1=1, 
         ylab1 = "y1", ylab2 = "y2", ...)
# Written by AE York Sept. 1996 for Splus; converted to R Jan 2001 
# Plots y1 vs x1 and y2 vs x2 on the same plot types type1 and type2
# Labels for y1 are on the left and labels for y2 on the right
        oldpar <- par()
        par(mar = rep(6, 4))    #       
        xlim <- range(pretty(range(c(x1, x2))))
        plot(x1, y1, lty = lty1, pch = pch1, type = type1, xlim = xlim,
             xlab = xlab, ylab = ylab1, ...)
        par(new = T)
        plot(x2, y2, lty = lty2, pch = pch2, type = type2, axes = F, xlim =
             xlim, xlab  = "", ylab = "")
        axis(side = 4)
        mtext(ylab2, side = 4, line = 2, outer = F)



Anne E. York
National Marine Mammal Laboratory
Seattle WA 98115-0070  USA
e-mail: anne.york at noaa.gov
Voice: +1 206-526-4039
Fax: +1 206-526-6615

On Fri, 26 Apr 2002 wouter.buytaert at yucom.be wrote:

>I'm looking for a way to plot different data series on one graph.
>I have a series of hourly rainfall and quarterly flow
>measurements (i.e. 4 times an hour) of a catchment. The rainfall
>should be plotted in bars, the flow as a line. Both on the same X
>axe (time) but with different Y axes.
>The problem is the plot() function does not support add=TRUE...
>Furthermore I'm not sure what's the best format for input data.
>Now it are two data frames with a time (POSIXct) and a
>rainfall/flow part. Maybe time series are easier, but in 
>ts(data = NA, start = X,...
>X should be a number or a vector. how does this coresponds to a
>data and hour (e.g. april 26,2002, 15:00:00)?
>Wouter Buytaert
>Institute for Land and Water Management
>Katholieke Universiteit Leuven
>r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
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