将文字添加到点阵图? [英] Add text to lattice plot?

问题描述

有人可以告诉我如何在格子图中添加文本行.

Could someone tell me how to add a text line to lattice plot.

我的代码是:

xyplot(Neff~Eeff,data=phuong,panel=mypanel,
       col="black",
       pch=18,xlab="Energy efficiency (%)",
       ylab = "Nitrogen efficiency (%)", main="(a)")

此处pane=mypanel用于添加退位. 我想在Eeff和Neff之间添加一个线性回归方程.

Here pane=mypanel is to add an abline. I want to add a linear regression equation between Eeff and Neff to their plot.

谢谢！

推荐答案

因此，使用可复制的数据:

So, with reproducible data:

set.seed(1)

phuong <- data.frame(Eeff = rnorm(100,31))
phuong$Neff <- rnorm(100,19.7 + .36*phuong$Eeff)

# Create the lm object ahead of time
lm1 <- lm(Neff ~ Eeff, data = phuong)

# Create the character string that you want to print
tp <- sprintf("%s=%.1f + %.2f %s", all.vars(formula(lm1))[1],
  coef(lm1)[1], coef(lm1)[2], all.vars(formula(lm1))[2])

# Change the mypanel function to use the lm1 object
mypanel<-function(x,y,...){
  panel.xyplot(x, y, ...)
  panel.abline(lm1)
  panel.text(30,33,labels=tp)
}

library(lattice)

# and off we go.

xyplot(Neff~Eeff,data=phuong,panel=mypanel,
       col="black",
       pch=18,xlab="Energy efficiency (%)",
       ylab = "Nitrogen efficiency (%)", main="(a)")

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