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How can I duplicate this style of graph, with multiple plots on one graph, and, preferably, legends attached as below.
I have tried the concept of "facet" but ggplot2 and trellis:xyplot both think of facets as separate panels rather than overlaid plots.
I can do it using plain Jane plot() and line().. but was using ggplot2 and woudl like to get multiple lines on one plot in that package.
Here is some example data in long form (captured from the plot using a nifty app called "Graphclick")
comp <- read.table(pipe("pbpaste"), header=T, sep=',')
company, year, sales
Apple,1975.003,17298.457
Apple,1977.302,16784.502
Apple,1978.314,17298.457
Apple,1980.246,20730.098
Apple,1981.533,27608.426
Apple,1984.293,40862.852
Apple,1986.408,50468.617
Apple,1987.328,48236.188
Apple,1988.892,35676.547
Apple,1989.904,34616.582
Apple,1991.192,44732.742
Apple,1992.387,44732.742
Apple,1993.399,39055.324
Apple,1995.791,37894.922
Apple,1996.895,39648.746
Apple,1998.274,52804.367
Apple,1999.378,61399.512
Apple,2001.770,2.350e5
Apple,2005.265,7.735e5
Toshiba,1999.378,86856.6
Toshiba,2001.862,1.192e5
Toshiba,2004.069,1.495e5
Toshiba,2004.069,1.495e5
IBM,1975.003,22019.092
IBM,1975.830,27195.193
IBM,1976.934,30682.320
IBM,1978.130,31148.527
IBM,1980.430,35676.547
IBM,1981.625,35676.547
IBM,1983.005,39648.746
IBM,1985.305,40862.852
IBM,1986.408,46102.508
IBM,1987.512,64241.156
IBM,1989.996,75832.898
IBM,1991.100,84276.039
IBM,1992.295,85556.641
IBM,1993.307,79342.539
IBM,1994.779,79342.539
IBM,1995.791,84276.039
IBM,1996.895,95082.484
IBM,1996.895,95082.484
Commodore,1975.003,33588.051
Commodore,1975.830,34616.582
Commodore,1977.118,25219.982
Commodore,1978.130,23388.229
Commodore,1979.326,25992.234
Commodore,1980.521,21689.514
Commodore,1981.717,25219.982
Commodore,1984.201,6999.029
Commodore,1985.213,1670.460
Commodore,1986.408,1458.447
(source: asymco.com)
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To draw multiple curves in one plot, different functions are created separately and the curve() function is called repeatedly for each curve function. The call for every other curve() function except for the first one should have added an attribute set to TRUE so that multiple curves can be added to the same plot.
To arrange multiple ggplot2 graphs on the same page, the standard R functions - par() and layout() - cannot be used. The basic solution is to use the gridExtra R package, which comes with the following functions: grid. arrange() and arrangeGrob() to arrange multiple ggplots on one page.
segment() function in R Language is used to draw a line segment between to particular points. Parameters: x, y: coordinates to draw a line segment between provided points. Here, x0 & y0 are starting points of the line segment and x1 & y1 are ending points of line segment .
If you're looking for the most control, you could just use the low-level plot and lines commands. Use "plot" to generate the first graph (with title, xlimits, and ylimits), then use "lines" to add lines to that graph.
plot(0,type="n", xlim=c(0,10), ylim=c(0,10), xlab="X Label", ylab="Y Label", main="Title")
Then add lines using the lines command:
lines(1:10, 1:10, type="l", lty=2)
lines(2:4, 10:8, col=2, type="l")
lines(6:9, c(5,6,5,6), col=3, type="l")
You can fine-tune the look by using all of the parameters listed in the "par" help file ("?par")
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