如何在R中找到三维数组的均值？
三维数组可以具有不同大小的矩阵，它们不一定是正方形或矩形。同样，数组中的所有元素都是相同的数据类型。如果要查找三维数组的均值，则可以在需要使用组合函数引用数组元素的行和列的地方使用apply函数。
示例
A1<-array(c(1:4,5:8,9:12),c(2,2,3))A1
输出结果
, , 1[,1] [,2]
[1,] 1 3
[2,] 2 4
, , 2
[,1] [,2]
[1,] 5 7
[2,] 6 8
, , 3
[,1] [,2]
[1,] 9 11
[2,] 10 12
> apply(A1,c(1,2),mean)
[,1] [,2]
[1,] 5 7
[2,] 6 8
示例
A2<-array(c(rpois(4,1),rpois(4,5),rpois(4,8)),c(2,2,3))A2
输出结果
, , 1[,1] [,2]
[1,] 1 2
[2,] 1 0
, , 2
[,1] [,2]
[1,] 2 4
[2,] 4 6
, , 3
[,1] [,2]
[1,] 8 2
[2,] 5 9
示例
apply(A2,c(1,2),mean)
输出结果
[,1] [,2][1,] 3.666667 2.666667
[2,] 3.333333 5.000000
示例
A3<-array(c(rpois(10,1),rpois(10,5),rpois(10,8)),c(2,5,3))A3
输出结果
, , 1[,1] [,2] [,3] [,4] [,5]
[1,] 1 0 1 1 0
[2,] 2 0 1 1 1
, , 2
[,1] [,2] [,3] [,4] [,5]
[1,] 7 4 8 5 4
[2,] 4 4 6 4 6
, , 3
[,1] [,2] [,3] [,4] [,5]
[1,] 5 4 11 9 7
[2,] 3 9 10 11 4
示例
<apply(A3,c(1,2),mean)
输出结果
[,1] [,2] [,3] [,4] [,5][1,] 4.333333 2.666667 6.666667 5.000000 3.666667
[2,] 3.000000 4.333333 5.666667 5.333333 3.666667
示例
A4<-array(c(rnorm(25,1,0.25),rnorm(25,5,3.2),rnorm(25,125,8)),c(5,5,3))A4
输出结果
, , 1[,1] [,2] [,3] [,4] [,5]
[1,] 0.9965280 1.2496879 1.0314247 0.708599 0.8077254
[2,] 0.7922626 1.0025704 0.7009782 1.142506 0.7445184
[3,] 1.0053649 0.5531278 1.4328092 1.385334 1.0892912
[4,] 0.9793857 1.3234864 0.5553419 1.215801 1.1023305
[5,] 1.3995579 1.0262346 1.2721514 1.394952 0.6184446
, , 2
[,1] [,2] [,3] [,4] [,5]
[1,] 6.174299 6.038592 12.470821 1.722607 1.069005
[2,] 3.789770 8.430932 8.747260 7.552801 3.886604
[3,] 1.730295 2.493142 3.465323 3.507519 3.834119
[4,] 6.075908 7.348407 4.118381 6.081857 4.167369
[5,] 4.130724 6.829041 7.469443 3.409544 5.808045
, , 3
[,1] [,2] [,3] [,4] [,5]
[1,] 110.6113 119.8429 121.6303 122.9954 140.5715
[2,] 125.5317 122.1797 135.2451 119.5165 122.9406
[3,] 124.0559 119.0249 135.1922 114.0559 112.1363
[4,] 118.1446 119.0530 134.6688 118.8334 124.4825
[5,] 120.2941 109.3362 119.8095 129.1414 127.6529
示例
apply(A4,c(1,2),mean)
输出结果
[,1] [,2] [,3] [,4] [,5][1,] 39.26071 42.37706 45.04419 41.80885 47.48274
[2,] 43.37124 43.87108 48.23111 42.73726 42.52389
[3,] 42.26385 40.69038 46.69677 39.64958 39.01991
[4,] 41.73330 42.57496 46.44750 42.04369 43.25072
[5,] 41.94148 39.06383 42.85037 44.64863 44.69313
示例
A5<-array(c(rexp(25,1.25),rexp(25,3.2),rexp(25,1.37)),c(5,5,3))A5
输出结果
, , 1[,1] [,2] [,3] [,4] [,5]
[1,] 1.3964752 0.14365375 0.1244120 0.006844883 0.1649243
[2,] 0.4146687 0.74798876 1.3172895 0.273072680 1.9675031
[3,] 0.5640029 0.05317204 0.1365023 1.139974748 0.4691554
[4,] 3.4377135 0.40737835 0.1296337 3.827344957 0.3062992
[5,] 0.5489296 0.68912311 0.9960337 1.891826684 0.6505368
, , 2
[,1] [,2] [,3] [,4] [,5]
[1,] 0.461391444 0.14704248 1.7219179 0.26808968 0.01277777
[2,] 0.002633461 0.02843441 0.5924807 0.59324483 1.34762650
[3,] 0.296192070 0.38350989 0.3453407 0.14514950 0.21145723
[4,] 0.137173681 0.34683067 0.9046680 0.05949873 0.42690397
[5,] 0.171683422 0.12761626 0.3183557 0.01596812 0.04222600
, , 3
[,1] [,2] [,3] [,4] [,5]
[1,] 0.7641526 0.78719016 0.96282362 0.02212902 0.3261842
[2,] 1.1584192 1.20147453 0.03766346 0.30549609 1.1452613
[3,] 0.5849248 1.97291039 0.52678525 0.78435948 0.0107882
[4,] 2.1916248 0.09176414 1.40056593 1.11841176 0.7624021
[5,] 0.1565796 1.35400081 0.26728881 0.36045571 0.3076494
示例
apply(A5,c(1,2),mean)
输出结果
[,1] [,2] [,3] [,4] [,5][1,] 0.8740064 0.3592955 0.9363845 0.09902119 0.1679621
[2,] 0.5252405 0.6592992 0.6491446 0.39060453 1.4867970
[3,] 0.4817066 0.8031974 0.3362094 0.68982791 0.2304670
[4,] 1.9221707 0.2819911 0.8116226 1.66841848 0.4985351
[5,] 0.2923976 0.7235801 0.5272261 0.75608351 0.3334708
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