[R] Grouped bars in barplot

[Peter Alspach]

Tena koe Steve

Convert your data into a matrix:

dataMat <- matrix(c(bline_precip[10,9], bline_runoff[10,9],
                    cccma_precip[10,9], cccma_runoff[10,9],
                    csiro_precip[10,9], csiro_runoff[10,9],
                    ipsl_precip[10,9], ipsl_runoff[10,9],
                    mpi_precip[10,9], mpi_runoff[10,9],
                    ncar_precip[10,9], ncar_runoff[10,9],
                    ukmo_precip[10,9], ukmo_runoff[10,9]), nrow=2)

Since I don't know the nature of your data I will use a simple example:

dataMat <- matrix(1:14, nrow=2)
barplot(dataMat, beside=TRUE, space=c(0,2))
tTicks <- barplot(dataMat, beside=TRUE, space=c(0,2))
tTicks <- tapply(tTicks, rep(1:7, each=2), mean)
axis(1, tTicks, letters[1:7])

Is that what you want?

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Steve Murray
> Sent: Thursday, 13 January 2011 12:14 p.m.
> To: r-help at r-project.org
> Subject: [R] Grouped bars in barplot
> 
> 
> Dear all,
> 
> I am trying to make a barplot with clustered pairs of bars, using
> class=numeric data and the following command:
> 
> barplot(c(bline_precip[10,9], bline_runoff[10,9], cccma_precip[10,9],
> cccma_runoff[10,9], csiro_precip[10,9], csiro_runoff[10,9],
> ipsl_precip[10,9], ipsl_runoff[10,9], mpi_precip[10,9],
> mpi_runoff[10,9], ncar_precip[10,9], ncar_runoff[10,9],
> ukmo_precip[10,9], ukmo_runoff[10,9]), beside=TRUE, space=c(0,2))
> 
> This results in all bars being packed tightly together, but with no gap
> between each pair. I suspect the problem is something to do with the
> data not being a matrix, but I've tried using as.matrix for each data
> element and this doesn't seem to work. If any one has any suggestions
> I'd be very grateful to hear them.
> 
> Also, I'm hoping to put a label beneath each pair of bars on the x-
> axis, in the centre. At present I can only get labels to appear
> directly underneath a single bar, as opposed to the centre of the pair
> of bars. Does anyone have any suggestions for solving this?
> 
> Many thanks for any help offered.
> 
> Steve
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> and provide commented, minimal, self-contained, reproducible code.

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