R中多个图的通用图例 [英] Common legend for multiple plots in R

问题描述

我正在一起使用R和Latex绘制一些图，并试图为它们全部创建一个共同的图例.

I am using R and Latex together to draw some plots and am trying to make a common legend for all of them.

我在同一页面上有六个单独的地块.我在R中分别制作了每个图，然后在Latex中使用\ includegraphics将它们显示在同一页面上.

I have six separate plots on the same page. I made each plot separately in R and then displayed them on the same page using \includegraphics in Latex.

每个图都有相同的图例信息，因此我不想在每个绘图中都有图例，而是希望在页面底部显示一个水平图例.不幸的是，我不知道如何在没有情节的情况下制作图例.一旦有了图例的单独图像，我将知道如何使用Latex将其包括在页面底部.

Each graph has the same legend information, so rather than having a legend in each plot I would like to have one horizontal legend on display at the bottom of page. Unfortunately, I can't figure out how to make a legend without a plot. Once I have a separate image for the legend, I will know how to include it at the bottom of the page using Latex.

我试图用来制作图例的代码是

The code I am trying to use to make the legend is

plot(1, type = "n", axes=FALSE, xlab="", ylab="")
plot_colors <- c("blue","black", "green", "orange", "pink")

legend(.6,1.3,legend = c("Fabricated Metal", "Iron and Steel", "Paper", 
"Beverages", "Tobacco"), 
       col=plot_colors, lwd=5, cex=.5, horiz = TRUE)

但是，字体太小，图例框的侧面被切除了.

But, the font is too small and the side of the legend box is cut off.

推荐答案

一个我正在谈论的简单示例:

A simple example of what I was talking about:

m <- matrix(c(1,2,3,4,5,6,7,7,7),nrow = 3,ncol = 3,byrow = TRUE)

layout(mat = m,heights = c(0.4,0.4,0.2))

for (i in 1:6){
    par(mar = c(2,2,1,1))
    plot(runif(5),runif(5),xlab = "",ylab = "")
}


plot(1, type = "n", axes=FALSE, xlab="", ylab="")
plot_colors <- c("blue","black", "green", "orange", "pink")
legend(x = "top",inset = 0,
        legend = c("Fabricated Metal", "Iron and Steel", "Paper","Beverages", "Tobacco"), 
        col=plot_colors, lwd=5, cex=.5, horiz = TRUE)

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