sharing the x axis in two plots

[Sebastian Weber]

Hi!

I have two observables which depend on the same time variable. I would like to plot these in two separate plots, but stack these onto one another in order to share the x-Axis for the sake of saving some space. So in principle I could arrange my data-set such that I can get what I want by facetting. However, I want in one of the two plots to draw a line which is there as a guide to the eye. geom_abline would now draw this line in both facets which is wrong. Another option to generate two plots and merge them via grid.layout is not working, since I can not suppress the x-tick marks separately from the y tick marks. This then yields in too much space between the two plots. So this boils down to

1. can I make ggplot2 draw a reference line in only one of the facets?

- or -

2. can I somehow suppress only the x-tick marks?

Thanks a lot in advance!

Sebastian Weber

[ONKELINX, Thierry]

Hi Sebastian,

Here is an example of an abline only showing in one facet. You need a
data frame with the properties of the abline and the corresponding
factors of the facetting.

library(ggplot2)
test <- data.frame(A= rnorm(100), B = rnorm(100), C = rbinom(100, 1,
0.5))
ggplot(test, aes(x = A, y = B)) +
geom_point() +
facet_wrap(~C, ncol = 1) +
geom_abline(data = data.frame(I = c(0, NA), S = c(1, NA), C =
c(0, 1)), aes(intercept = I, slope = S))

Best regards,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen
Belgium

Research Institute for Nature and Forest
team Biometrics & Quality Assurance
Gaverstraat 4
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Belgium

tel. + 32 54/436 185
Thierry....@inbo.be
www.inbo.be

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[Sebastian Weber]

Great!

This works! thanks a lot!

Now, the next problem: How to have two y-labels? ylab(c("LABEL1", "LABEL2")) does not do the job. Any suggestions?

Sebastian