r - Removing empty group spaces in barcharts of ggplot2/lattice -


this follows on q&a regarding plotting defined groups using barchart in lattice. following solution little exercise, i've realised r plots data appears in dataframe , leaves spaces between each bar, when next row of data allocated space on barchart. if @ plot you'll understand mean:

> data.frame(soexample2)    study.id diagnosis   level 1         1    cancer 1040.58 2         2    cancer  810.92 3         3    cancer 2087.80 4         4    cancer 3959.02 5         5    cancer 3648.48 6         6    cancer 1191.74 7         7    cancer 1156.90 8         8    cancer 2705.56 9         9    cancer  827.26 10       10    cancer  867.16 11       11    cancer  575.10 12       12    cancer  699.85 13       13    cancer 1121.86 14       14    cancer 1830.62 15       15    cancer 4203.01 16       16    cancer  874.59 17       17    cancer 1037.20 18       18    cancer 1398.56 19       19    cancer  910.49 20       20    cancer  725.60 21       21    cancer  894.05 22       22    cancer 1489.25 23       23    cancer 1518.76 24       24    cancer  821.60 25       25    cancer  530.35 26       26    cancer 1191.80 27       27    cancer 1920.12 28       28    cancer 1330.60 29       29    cancer  835.95 30       30    cancer  525.22  require(lattice) soexample2$group<-ifelse(level>median(level),1,0) barchart(level~factor(group), data=soexample2, groups=study.id) 

this gives me following barchart:

read chart left right understand how r makes spaces between groups

similarly, can same in ggplot2, same thing occurs:

require(ggplot2) g1<-ggplot(soexample2, aes(x=group, y=level)) g1+geom_histogram(stat="identity")+facet_grid(.~group)+labs(x="group")+labs(y="levels") 

the same plot made ggplot

so, ideas on how remove these empty spaces?

cheers,

oliver

you can use study.id x values , convert them factor ensure values aren't interpreted numeric. ggplot2 solution inside facet_grid() add argument scale="free" remove empty levels.

ggplot(soexample2,aes(factor(study.id),y=level))+              geom_bar(stat="identity")+              facet_grid(.~group,scales="free") 

enter image description here


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