用plotmath保持尾随零 [英] Keeping trailing zeroes with plotmath
问题描述
我使用 annotate()
覆盖我的 ggplot2
图中的文字。我使用 parse = T
选项,因为我需要使用希腊字母rho。我希望文字说 = -0.50
,但尾部的零会被裁剪,而我会得到 -0.5
。
下面是一个例子:
library(ggplot2)
x <-rnorm(50)
y <-rnorm(50)
df <-data.frame(x,y)
ggplot(data = df,aes x = x,y = y))+
geom_point()+
annotate(geom =text,x = 1,y = 1,label =rho == - 0.50 T)
有谁知道我能如何得到最后的0?我认为我可以像这样使用 paste()
:
annotate( geom =text,x = 1,y = 1,label = paste(rho == - 0.5,0,sep =),parse = T)
但是我得到错误:
错误解析(text = lab):< text>:1:11:意外数字常量
1:rho == - 0.5 0
^
它是 plotmath
表达式解析问题;它不是 ggplot2
有关。
你可以做的是确保 0.50
被解释为一个字符串,而不是一个将被舍入的数值:
pre $ g $ pggplot(data = df, aes(x = x,y = y))+
geom_point()+
annotate(geom =text,x = 1,y = 1,label =rho ==' - 0.50' ,parse = T)
使用 base
:
plot(1,type ='n')
text(1.2,1.2 ,表达式(rho ==' - 0.50'))
text(0.8,0.8,expression(rho == 0.50))
如果您想要更通用的方法,请尝试如下所示:
sprintf('rho == %1.2f',0.5)
有一个 r-help thread 与此问题相关。
I'm using annotate()
to overlay text on one of my ggplot2
plots. I'm using the option parse=T
because I need to use the Greek letter rho. I'd like the text to say = -0.50
, but the trailing zero gets clipped and I get -0.5
instead.
Here's an example:
library(ggplot2)
x<-rnorm(50)
y<-rnorm(50)
df<-data.frame(x,y)
ggplot(data=df,aes(x=x,y=y))+
geom_point()+
annotate(geom="text",x=1,y=1,label="rho==-0.50",parse=T)
Does anyone know how I can get the last 0 to show up? I thought I could use paste()
like this:
annotate(geom="text",x=1,y=1,label=paste("rho==-0.5","0",sep=""),parse=T)
but then I get the error:
Error in parse(text = lab) : <text>:1:11: unexpected numeric constant
1: rho==-0.5 0
^
It is an plotmath
expression parsing problem; it's not ggplot2
related.
What you can do is ensure that 0.50
is interpreted as a character string, not a numeric value which will be rounded:
ggplot(data=df, aes(x=x, y=y)) +
geom_point() +
annotate(geom="text", x=1, y=1, label="rho=='-0.50'", parse=T)
You would get the same behavior using base
:
plot(1, type ='n')
text(1.2, 1.2, expression(rho=='-0.50'))
text(0.8, 0.8, expression(rho==0.50))
If you want a more general approach, try something like
sprintf('rho == "%1.2f"',0.5)
There is an r-help thread related to this issue.
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