如何对矩阵的条形图进行排序？

Question

data <- structure(list(W= c(1L, 3L, 6L, 4L, 9L), X = c(2L, 5L, 
4L, 5L, 12L), Y = c(4L, 4L, 6L, 6L, 16L), Z = c(3L, 5L, 
6L, 7L, 6L)), .Names = c("W", "X", "Y", "Z"),
     class = "data.frame", row.names = c(NA, -5L))
colours <- c("red", "orange", "blue", "yellow", "green")

barplot(as.matrix(data), main="My Barchart", ylab = "Numbers", 
          cex.lab = 1.5, cex.main = 1.4, beside=TRUE, col=colours).

工作正常，但我需要通过减少来对每个组（单独）进行排序，即显示相同的情节，但W，...，Z从高到低排序。示例：对于W，绿色将首先从左侧，蓝色，黄色，....对于x，绿色将首先从左侧，橙色，黄色等等。

Answer 1

这可以通过生成颜色向量来实现，该颜色向量包含与条形图一样多的元素并分别对每个矩阵列进行排序：

根据每列的x顺序对颜色进行排序并转换为vector：

colours <- as.vector(apply(data, 2, function(x){
  col <- colours[order(x)]
  }))

对每一列进行分类：

df <- apply(data, 2, sort)

barplot(df,
        main = "My Barchart",
        ylab = "Numbers",
        cex.lab = 1.5,
        cex.main = 1.4,
        beside = TRUE,
        col = colours)

降序和图例

colours <- c("red", "orange", "blue", "yellow", "green")

colours1 <- as.vector(apply(data, 2, function(x){
  col <- colours[order(x, decreasing = TRUE)]
  }))

barplot(apply(data, 2, sort,  decreasing = TRUE),
        main = "My Barchart",
        ylab = "Numbers",
        cex.lab = 1.5,
        cex.main = 1.4,
        beside = TRUE,
        col = colours1)

legend("topleft", c("First","Second","Third","Fourth","Fifth"), cex=1.3, bty="n", fill=colours)

这里使用一个颜色矢量为条形图着色，另一个颜色矢量用于图例

最后是关于汇总数据的评论中的问题：

all <- apply(data, 1, mean)
colours <- c("red", "orange", "blue", "yellow", "green")

barplot(sort(all, decreasing = T), col = colours[order(all, decreasing = T)])