change axes manually in facet_wrap?

[Anna Zakrisson Braeunlich]

Hi ggplot2 group,

I have a question regarding manually controlling the axes in facet_wrap, not using scales="free"/"fixed".

# I KNOW THAT THIS PLOT IS UGLY, I AM RUBBISH AT MAKING DUMMY DATA THAT MIMICS MY REAL DATA.

### Question: I would like to change the y-axis ONLY IN FACETS 3-4 manually, but keep the

### axis for facets 1&2 (run the code and see plot).

### My problem is that in my real data facet 1&2 have similar data range (going up to values ~400)

### and 3&4 similar (ranging from ~1-16).

### When I set the scales="free" it all looks quite good, except for that the axes are 

### slightly nudged in facet 3 compared with facet 4. I would therefore, for clarity, like to

### set these axes as identical, but still keep the axes for facets 1&2.

### How can I tweak facet_wrap so as to manually set the y-axes?

### Some dummy data:

mydata<- data.frame(factor1 = factor(rep(LETTERS[1:6], each = 80)), 

                  factor2 = factor(rep(c(1:5), each = 16)), 

                  factor3 = factor(rep(c(1:4), each = 4)), 

                  var1 = rnorm(120, mean = rep(c(0, 3, 5), each = 40), 

                  sd = rep(c(1, 2, 3), each = 20)), 

                  var2 = rnorm(120, mean = rep(c(6, 7, 8), each = 40), 

                  sd = rep(c(1, 2, 3), each = 20))) 

p <- ggplot(mydata,aes(x=factor1,y=var1))+

  geom_point(mapping=aes(shape=factor2))+

  facet_wrap(~factor3, scales = "free")

Many thank's!

best

Anna Zakrisson

Anna Zakrisson Braeunlich
PhD student

Department of Ecology, Environment and Plant Sciences

Stockholm University
Svante Arrheniusv. 21A
SE-106 91 Stockholm

Sweden/Sverige

Lives in Berlin.

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[Ben Bond-Lamberty]

Hi Anna, see this stackoverflow answer, which has a clever solution
involving geom_blank():
http://stackoverflow.com/questions/18046051/setting-individual-axis-limits-with-facet-wrap-and-scales-free-in-ggplot2

In your example, if p <- ggplot( ... ) you could do

p+geom_blank(data=data.frame(factor3=3:4,factor1="A",var1=15))

to just change the y axis of the bottom two facets.

Ben

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