如何在R中按升序独立地对矩阵列进行排序？
对矩阵列按升序进行独立排序意味着按升序对数据帧的每一列进行排序，因此，一列中的值排序不会影响其他列中的排序。可以通过apply函数以及sort函数（如以下示例所示）来完成此操作。
示例
M1<-matrix(rpois(80,5),ncol=4)输出结果M1
[,1] [,2] [,3] [,4][1,] 4 7 9 4
[2,] 5 6 6 2
[3,] 4 7 3 4
[4,] 4 3 2 2
[5,] 6 3 9 3
[6,] 7 5 5 5
[7,] 4 5 5 4
[8,] 2 4 0 6
[9,] 11 5 5 7
[10,] 2 3 5 6
[11,] 3 1 9 7
[12,] 5 10 6 7
[13,] 5 5 7 5
[14,] 6 3 1 3
[15,] 5 4 8 7
[16,] 4 10 4 3
[17,] 6 4 3 1
[18,] 2 6 5 2
[19,] 6 10 12 3
[20,] 9 2 3 4
申请(M1,2,sort)
[,1] [,2] [,3] [,4][1,] 2 1 0 1
[2,] 2 2 1 2
[3,] 2 3 2 2
[4,] 3 3 3 2
[5,] 4 3 3 3
[6,] 4 3 3 3
[7,] 4 4 4 3
[8,] 4 4 5 3
[9,] 4 4 5 4
[10,] 5 5 5 4
[11,] 5 5 5 4
[12,] 5 5 5 4
[13,] 5 5 6 5
[14,] 6 6 6 5
[15,] 6 6 7 6
[16,] 6 7 8 6
[17,] 6 7 9 7
[18,] 7 10 9 7
[19,] 9 10 9 7
[20,] 11 10 12 7
示例
M2<-matrix(rnorm(45),ncol=3)输出结果M2
[,1] [,2] [,3][1,] 0.7035341 0.1684070 0.6266624
[2,] 0.9411680 0.3888510 -0.6253838
[3,] -1.5572345 0.2111508 1.6147692
[4,] 0.9861180 0.3051785 0.4764457
[5,] 0.4121853 -0.2924738 -0.6538284
[6,] -0.2941798 1.4971932 -1.0346647
[7,] -0.8095073 0.2299736 0.9276157
[8,] 0.6784916 -0.3066246 -2.1540382
[9,] 0.3752442 -0.8025764 -0.8814537
[10,] 0.5712123 1.4410942 -0.8682303
[11,] 0.8312513 -1.0763055 1.8776386
[12,] -0.8845890 -0.3053165 1.1853445
[13,] -1.2043000 0.3795757 0.1601545
[14,] -0.8973574 -2.6955627 1.4023479
[15,] -0.7261224 2.0387155 1.0077507
申请(M2,2,sort)
[,1] [,2] [,3][1,] -1.5572345 -2.6955627 -2.1540382
[2,] -1.2043000 -1.0763055 -1.0346647
[3,] -0.8973574 -0.8025764 -0.8814537
[4,] -0.8845890 -0.3066246 -0.8682303
[5,] -0.8095073 -0.3053165 -0.6538284
[6,] -0.7261224 -0.2924738 -0.6253838
[7,] -0.2941798 0.1684070 0.1601545
[8,] 0.3752442 0.2111508 0.4764457
[9,] 0.4121853 0.2299736 0.6266624
[10,] 0.5712123 0.3051785 0.9276157
[11,] 0.6784916 0.3795757 1.0077507
[12,] 0.7035341 0.3888510 1.1853445
[13,] 0.8312513 1.4410942 1.4023479
[14,] 0.9411680 1.4971932 1.6147692
[15,] 0.9861180 2.0387155 1.8776386
示例
M3<-matrix(runif(40,2,10),ncol=2)输出结果M3
[,1] [,2][1,] 8.265500 3.812385
[2,] 8.213926 9.066299
[3,] 9.004847 5.589592
[4,] 6.364649 6.756629
[5,] 4.953512 3.778917
[6,] 8.354575 6.133739
[7,] 6.494883 7.320632
[8,] 2.769262 5.570083
[9,] 4.301743 6.874214
[10,] 5.467977 5.934101
[11,] 7.847425 9.373401
[12,] 7.860578 9.059702
[13,] 6.378894 3.864647
[14,] 7.988057 7.527622
[15,] 3.395857 2.156028
[16,] 3.060717 9.413530
[17,] 9.574119 2.519779
[18,] 9.705956 2.428624
[19,] 3.753683 6.364985
[20,] 9.969481 8.733604
申请(M3,2,sort)
[,1] [,2][1,] 2.769262 2.156028
[2,] 3.060717 2.428624
[3,] 3.395857 2.519779
[4,] 3.753683 3.778917
[5,] 4.301743 3.812385
[6,] 4.953512 3.864647
[7,] 5.467977 5.570083
[8,] 6.364649 5.589592
[9,] 6.378894 5.934101
[10,] 6.494883 6.133739
[11,] 7.847425 6.364985
[12,] 7.860578 6.756629
[13,] 7.988057 6.874214
[14,] 8.213926 7.320632
[15,] 8.265500 7.527622
[16,] 8.354575 8.733604
[17,] 9.004847 9.059702
[18,] 9.574119 9.066299
[19,] 9.705956 9.373401
[20,] 9.969481 9.413530
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