Hi,

I would like to thank you for a great package and for all help I have recieved in the past. To my question:
I have a plot where I have used facet_grid. I have factor: station (B1, BY31, H2) and factor: year (2007, 2008). The plot has two "plot panels" empty as there are no combinations H2:2007 and BY31:2008. For my own data, there is only one panel empty (I am bad at making appropriate dummy data as I am quite new to this) and I am not allowed to publish it like this. The empty  panel needs to be removed.

I have tried loads of things like removing H2:2007 and BY31:2008 by using:
mydata_truncated <- mydata[
  mydata$
    station != "BY31" |
    mydata$Year !="2008", ]

and have tried facet_grid(year~station, scales = "fixed", drop=TRUE) this doesn't work as all factors are used, it is only a combination of factor levels that need to go.
I would be extremely grateful for any help.

The script:
mydata<- data.frame(week = factor(rep(c("19", "21", "23", "25"), each = 10*3)),
                    station = factor(rep(c("BY31", "B1", "H2"), each = 40)),
                    year = factor(rep(c("2007", "2008"), each = 60)),
                    organism = factor(rep(c("zpl", "ses", "cy"), each = 40)),
                    values = rnorm(120, mean = rep(c(0, 3, 15), each = 10),
                                 sd = rep(c(1, 3, 6), each = 10)))


p <- ggplot(mydata,aes(week,values))+
  facet_grid(year~station, scales = "fixed", drop=TRUE)+ #drop=TRUE does not work as all factors are used
  scale_shape_manual(values = 1:3) +
  geom_point(mapping=aes(shape=factor(organism)))+
  theme_bw() +
  theme(strip.background = element_blank()) +
  ggtitle("this plot is ugly but ignore that")+
  xlab("my x-axis stuff")+
  ylab("my y-axis stuff")+
  theme(legend.title=element_blank(), legend.key =
          element_blank())
p

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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E-mail: anna.zakrisson@su.se
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