r - 按行方式对矩阵行进行排序

Question

我有一个矩阵 m :

m <- matrix(c(1, 8, 3, 1, 2, 4, 9, 0, 0), nrow = 3, byrow = TRUE)
m

     [,1] [,2] [,3]
[1,]    1    8    3
[2,]    1    2    4
[3,]    9    0    0

我计算 rowMeans(m) :

r.mean <- rowMeans(m)
r.mean

[1] 4.000000 2.333333 3.000000

如何使用 r.mean 对矩阵 m 从最大均值到最小值进行排序:

     [,1] [,2] [,3]
[1,]    1    8    3
[2,]    9    0    0
[3,]    1    2    4

Answer 1

像这样吗？

m[ order(rowMeans(m)), ]
     [,1] [,2] [,3]
[1,]    1    2    4
[2,]    9    0    0
[3,]    1    8    3

从最大均值到最小值，通过加，递减=T

m[ order(rowMeans(m), decreasing = T), ]
     [,1] [,2] [,3]
[1,]    1    8    3
[2,]    9    0    0
[3,]    1    2    4