在R中为使用文本的图形编写标签，并使用bquote，paste或expression编写下标 [英] writing a label in R for a plot using text, and subscripts using either bquote, paste or expression

问题描述

我在使用引号，粘贴和表达方式时遇到一些困难. 我使用了一个程序包，该程序包根据从数据文件获得的一些结果为我提供了一些绘图.结果保存为对象(MIN.ED和MIN.error). 对于图，我想使用那些结果对象和文本来标记图上的某些线.

I am having some difficulty with the use of quote, paste and expression. I use a package that gives me some plot based on some results obtained from a data file. The results are saved as objects (MIN.ED and MIN.error). For the plot, I would like to label some of the lines on the plot using those result objects as well as text.

对于标签，我使用以下

line1abel<-paste("MAM"[3],MIN.ED,"\U00B1",MIN.error)

我尝试使用 "MAM"["3"}或 "MAM[3]"，并继续获得NA.

I have tried variants using "MAM"["3"}or "MAM[3]"and keep on getting NA.

MAM是模型类型，3是用于该模型的参数数量. 我希望将其显示为MAM下标3，但我得到的只是NA，后跟MIN.ED的值±MIN.error的值.

MAM is the model type and 3 is the number of parameters used for that model. I would like that to appear as MAM subscript3 but all I get is NA followed by the value for MIN.ED ± value for MIN.error.

我看完了不同的下标后，我真的看不到为什么我得到了NA值.我看到有些帖子使用bquote，而其他帖子expressions等，但是对于绘图包，我需要将线标签指定为line.labels=c(line1lable,line2label...)

I have looked right through the different subscript posts and I really cannot see why I get that NA value. I see that some posts use bquote, and others expressions etc, but with the plotting package, I need to to give the line labels as line.labels=c(line1lable,line2label...)

如何用文本MAM和下标"3"构建标签表达式，为什么我得到"NA"?我以为粘贴允许将文本和结果有效地链接为文本，并且在最坏的情况下，我将拥有MAM ​​[3] 44±2而不是NA 44±2！

How can build the label expression with the text MAM and subscript "3" and why is it that I get a "NA"? I thought paste allowed to link effectively text and results as text and that at worst I would have had MAM[3] 44 ± 2 rather than NA 44 ± 2!

推荐答案

MAM <- "text"
grid::grid.text(bquote(.(MAM)[3]))

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