使用 ggplot2 仅将一个段添加到一个方面 [英] Add a segment only to one facet using ggplot2
问题描述
举个例子，我有这个数据框，叫做my_data:
As an example, I have this data frame, called my_data:
Groups FactorA FactorB FactorC N value sd se ci
1 Control Condition1 Condition1 Condition1 3 92.00000 6.0827625 3.511885 15.110420
2 Control Condition1 Condition1 Condition2 2 69.00000 8.4852814 6.000000 76.237228
3 Control Condition1 Condition2 Condition1 3 72.33333 10.2632029 5.925463 25.495209
4 Control Condition1 Condition2 Condition2 2 97.00000 2.8284271 2.000000 25.412409
5 Control Condition2 Condition1 Condition1 3 85.00000 13.0000000 7.505553 32.293790
6 Control Condition2 Condition1 Condition2 2 78.50000 16.2634560 11.500000 146.121354
7 Control Condition2 Condition2 Condition1 3 95.00000 5.1961524 3.000000 12.907958
8 Control Condition2 Condition2 Condition2 2 78.00000 22.6274170 16.000000 203.299276
9 Experimental Condition1 Condition1 Condition1 2 80.00000 5.6568542 4.000000 50.824819
10 Experimental Condition1 Condition1 Condition2 3 74.00000 19.9248588 11.503623 49.496093
11 Experimental Condition1 Condition2 Condition1 2 68.50000 0.7071068 0.500000 6.353102
12 Experimental Condition1 Condition2 Condition2 3 78.66667 18.5831465 10.728985 46.163095
13 Experimental Condition2 Condition1 Condition1 2 81.00000 19.7989899 14.000000 177.886866
14 Experimental Condition2 Condition1 Condition2 3 75.33333 17.0391706 9.837570 42.327646
15 Experimental Condition2 Condition2 Condition1 2 81.50000 14.8492424 10.500000 133.415150
16 Experimental Condition2 Condition2 Condition2 3 78.00000 5.2915026 3.055050 13.144821
使用此代码创建
my_data <- data.frame(Groups=c(rep("Control",20),rep("Experimental",20)),
FactorA=rep(c("Condition1","Condition2"),20),
FactorB=rep(c("Condition1","Condition1","Condition2","Condition2"),10),
FactorC=rep(c(rep("Condition1",4),rep("Condition2",4)),5),
value=sample(60:100,40,replace=T)
)
# add standard errors with a specific function
my_data <- summarySE(my_data,
measurevar="value",
groupvars=c("Groups","FactorA","FactorB", "FactorC"))
然后，使用此代码:
ggplot(my_data, aes(Groups,value,fill=FactorA)) +
geom_bar(position=position_dodge(), stat="identity") +
geom_errorbar(aes(ymin=value-se, ymax=value+se),
width=.1, # Width of the error bars
position=position_dodge(.9)) +
facet_grid(FactorB~FactorC) +
geom_segment(x=0.8,y=100,xend=1.2,yend=100) +
theme(axis.text.x=element_text(size=12, colour="black"),
axis.title.x=element_blank(),
legend.key.size=unit(1,"cm"),
legend.text=element_text(size=14),
plot.title=element_text(lineheight=.8, face="bold"),
panel.margin=unit(1, "lines"),
axis.title.y = element_text(size = 16, vjust=0.3),
strip.text.y = element_text(size=16,face="bold"),
strip.text.x = element_text(size=16,face="bold")) +
coord_cartesian(ylim=c(60, 120))
我得到了这个情节
如您所见，在 geom_segment(x=0.8,y=100,xend=1.2,yend=100) 行中，出现了四个部分，每个方面一个，但我想仅在一个方面绘制线段(例如在左上角的图中).
As you can see, with the line geom_segment(x=0.8,y=100,xend=1.2,yend=100) there appear four segments, one for each facet, but I want to draw a segment only in one facet (for example in the upper left plot).
有人可以帮我吗?我尝试了各种解决方案，但一无所获.
推荐答案
将段的数据放入数据框中，并添加列 FactorB 和 FactorC 与级别您需要绘制线段.
Put the data for the segment in data frame and also add columns FactorB and FactorC with levels for which you need to draw the segment.
data.segm<-data.frame(x=0.8,y=100,xend=1.2,yend=100,
FactorB="Condition1",FactorC="Condition1")
现在使用此数据框添加段.还要在 geom_segment() 中添加 inherit.aes=FALSE 以忽略 ggplot() 中设置的 fill=FactorA.
Now use this data frame to add segment. Also add inherit.aes=FALSE inside geom_segment() to ignore fill=FactorA set in ggplot().
+ geom_segment(data=data.segm,
aes(x=x,y=y,yend=yend,xend=xend),inherit.aes=FALSE)+
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