我正在尝试使用分面图绘制数据子集。它是2列x4行的图表。第一列的值在120到150之间,第二列的值在180到250之间,并且变量在数据文件中被分配为“较小”或“较大”。我遇到了一个问题,就是如何将特定标签(“120 <= 希腊字母(alpha) <= 150”、“180 <= 希腊字母(alpha) <= 250”)添加到列变量(“较小”,“较大”)中。我尝试这样做:
require(graphics)
library(ggplot2)
hp <- ggplot2(data) + ....
xlow <- paste("120 <", expression(alpha), " < 150")
xhi <- paste("180 <", expression(alpha), " < 250")
mf_labeller <- function(var, value){
value <- as.character(value)
if (var=="regime") {
value[value=="Lesser"] <- xlow
value[value=="Greater"] <- xhi
}
return(value)
}
(hp %+% data) + facet_grid(param~regime, scales="free", labeller=mf_labeller)
我遇到了一个错误:"Error in value == "Greater" : comparison is not allowed for expressions"。我尝试过强制转换数据,但是没有成功。如果我按任何方式进行标记:
data2 <- transform(data, regime = factor(regime, levels=c("Lesser", "Greater"), labels=c(expression(paste("120 <", alpha," < 150")), expression("180 < alpha < 250"))))
我得到了整个表达式的原文,但没有得到所需的图形。我可能漏掉了一些东西。 非常感谢任何帮助! 提前致谢。
我的样本摘录如下:
regime,param,line,XX,Var,sner
Lesser,Rise,VII,AA,4.968624,0.1275248
Lesser,Rise,VII,BB,3.719405,0.08470305
Lesser,Rise,VII,CC,7.608773,0.177848
Lesser,Rise,VII,DD,9.874395,0.1367159
Lesser,Text,VII,AA,4.968624,0.1275248
Lesser,Text,VII,BB,3.719405,0.08470305
Lesser,Text,VII,CC,7.608773,0.177848
Lesser,Text,VII,DD,9.874395,0.1367159
Lesser,Chant,VII,AA,0.1771826,0.186758
Lesser,Chant,VII,BB,0.3611497,0.5484656
Lesser,Chant,VII,CC,0.7719002,0.8864444
Lesser,Chant,VIII,DD,1.829022,0.2639881
Greater,Rise,VII,AA,4.968624,0.1275248
Greater,Rise,VII,BB,3.719405,0.08470305
Greater,Rise,VII,CC,7.608773,0.177848
Greater,Rise,VII,DD,9.874395,0.1367159
Greater,Text,VII,AA,4.968624,0.1275248
Greater,Text,VII,BB,3.719405,0.08470305
Greater,Text,VII,CC,7.608773,0.177848
Greater,Text,VII,DD,9.874395,0.1367159
Greater,Chant,VII,AA,0.1771826,0.186758
Greater,Chant,VII,BB,0.3611497,0.5484656
Greater,Chant,VII,CC,0.7719002,0.8864444
Greater,Chant,VIII,DD,1.829022,0.2639881
我使用的代码是:我之前在帖子中写错了表达式,但我在代码中使用了正确的表达式。
x <- read.table("sample.csv", header=T, sep=',')
require(graphics)
library(ggplot2)
ppi <- 300
png("figure.png", width=6*ppi, height=6*ppi, res=ppi)
hp <- ggplot(data=x,aes(x=XX, y=Var, colour=line, group = line)) + geom_errorbar(aes(ymin=Var-sner, ymax=Var+sner, colour=line), width=.3) + geom_line(aes(ymax=Var+sner), size=0.7) + geom_point(aes(ymax=Var+sner), shape=21, size=2,fill="white") + theme_bw() + theme(axis.text.x = element_text(angle=90,vjust=0.25), panel.grid.minor=element_blank(), panel.grid.major=element_blank(), panel.background =element_blank(), legend.position="none" ) + scale_colour_hue(l=40)
xlow <- expression(paste("120 <",alpha," < 150"))
xhi <- expression(paste("180 <", alpha," < 250"))
.. earlier code block as alternative here...
data2 <- transform(x, regime = factor(regime, levels=c("Lesser", "Greater"), labels=c( bquote(120<.(alpha)~phantom()<150), bquote(180<.(alpha)~phantom()<250) )
(hp %+% data2) + facet_grid(param~regime, scales="free", labeller=label_bquote)
我之前也尝试使用 mf_labeller..
提前感谢您。