在百分号(%)中使用ggplot2中的plotmath [英] Using plotmath in ggplot2 with percent sign (%)
问题描述
我希望在ggplot2条形图的facet标签中使用希腊字符,拉丁字符和百分号。可以用'facet_grid(。〜variable,labeller = label_parsed)'完成希腊字符:
$ p $ a< -c(Delta 〜V,VarcoV,Delta〜V,VarcoV)
b< -c(1,2,3,4)
d< -c(one,one ,two,two)
mydata <-data.frame(cbind(b,a,d))
ggplot(mydata,aes(x = d,y = b))+ facet_grid(。〜a,labeller = label_parsed)+ geom_bar(stat =identity)
还需要添加包含%和拉丁字符的facet标签:
a< -c(Delta〜V, VarcoV,%V,Delta〜V,VarcoV,%V)
pre>
b <-c(1,2,3,4,5,6)
d < ; -c(one,one,one,two,two,two)
mydata <-data.frame(cbind(b,a,d))
ggplot(mydata,aes(x = d,y = b))+ facet_grid(。〜a,labeller = label_parsed)+ geom_bar(stat =identity)
这会产生以下错误:
解析错误( text = x):< text>:1:1:意外输入
1:%V
^
任何想法如何包含百分号?
解决方案拉丁字符不需要任何特殊处理,您可以在
a
的第一个元素中看到它。试试这个:
a< -c(Delta_V,VarcoV,'%'* V, Delta〜V,VarcoV,'%'* V)
标志很特别,所以你需要引用它。您可以刚刚完成'%V',但是我扔了*(星号)来显示如何分隔 plotmath 标记而不显示空格。 (您已经知道如何使用间距分隔符分隔标记,〜。)
关键的一课是混合引号类型。第一个引用类型将指示用于终止字符标记/字符串的类型。您也可以使用转义字符:\。这也成功了:
a< -c(Delta〜V,VarcoV,\%\ * V,Delta〜V,VarcoV,\%\* V)
I would like to use Greek characters, Latin characters and the percent sign in the facet labels of a ggplot2 bar chart. Greek characters can be done with 'facet_grid(.~variable, labeller=label_parsed)':
a<-c("Delta~V","VarcoV","Delta~V","VarcoV") b<-c(1,2,3,4) d<-c("one","one","two","two") mydata<-data.frame(cbind(b,a,d)) ggplot(mydata,aes(x=d,y=b))+facet_grid(.~a, labeller=label_parsed)+geom_bar(stat="identity")
Now I also want to add a facet label that includes % and a Latin character:
a<-c("Delta~V","VarcoV","%V","Delta~V","VarcoV","%V") b<-c(1,2,3,4,5,6) d<-c("one","one","one","two","two","two") mydata<-data.frame(cbind(b,a,d)) ggplot(mydata,aes(x=d,y=b))+facet_grid(.~a, labeller= label_parsed)+geom_bar(stat="identity")
This produces the following error:
Error in parse(text = x) : <text>:1:1: unexpected input 1: %V ^
Any ideas how to include the percent sign?
解决方案Latin characters do not need any special treatment and you can see this in the first element of
a
. Try this:a<-c("Delta~V","VarcoV","'%'*V","Delta~V","VarcoV","'%'*V")
The "%" sign is special so you need to quote it. You could have just done '%V' but I threw in the "*" (asterisk) to show how to separate plotmath tokens with no displayed space. (You already appear to know how to separate tokens with the spacing-separator, "~".)
The key lesson is to mix type of quotes. The first quote type will signal which type is used to terminate the character token/string. You can also use the escape character: "\". This also succeeds:
a<-c("Delta~V","VarcoV","\"%\"*V","Delta~V","VarcoV","\"%\"*V")
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