[R] Adding a line to a beside=TRUE barplot

[Peter Ehlers]

On 2011-06-02 13:09, Galen Moore wrote:
> Greetings –
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> Grateful for any help on this one:
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> In the following demo code, I am trying to get the points in the line to
> appear over the same x-axis labels as are used by the paired Bars.  It
> appears, however, that R/lattice ignores the x-axis points used by the bars
> and plots the x points for the line at ½ points.
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> Can you help me tweak this code so that the nth bump in the line appears
> over the same nth pair of bars?  I’m open to any options besides
> lattice/barplot.
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> library(lattice)
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> aa<- abs(rnorm(c(1:10)))*5
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> bb<- abs(rnorm(c(1:10)))*5
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> cc<- abs(rnorm(c(1:10)))*5
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> dd<- as.matrix(cbind(aa, bb))
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> barplot(t(dd), beside=TRUE, ylim=c(0,10))
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> lines(cc)

What's lattice doing here? barplot() is not a lattice function.

Careful reading of the help page for barplot and study
of the examples will lead you to:

   mp <- barplot(t(dd), beside=TRUE)
   mp
   lines(colMeans(mp), cc, col=2, lwd=3)


Peter Ehlers

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> Many thanks,
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> Galen
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