如何将矩阵RGB转换为R中的图像

Question

我正在Coursera中学习一门有关python机器学习的课程，我想在R中重现该练习。

因此，基本上，数据集是64x64猫图像。您可以下载完整的数据集  here。并使用以下代码将其装入R中，并带有“ rhdf5”包：

source("http://bioconductor.org/biocLite.R")
biocLite("rhdf5")
library(rhdf5)
mydata_train_x <- h5read("./data_in/train_catvnoncat.h5","train_set_x")

我得到的是一个如下数组：

, , 1, 1

     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14] [,15] [,16] [,17] [,18] [,19]
[1,]   17   22   25   25   27   28   30   31   32    34    35    36    35    34    33    33    32    31    30
[2,]   31   33   35   35   36   38   41   43   47    49    50    51    50    49    48    48    47    46    44
[3,]   56   59   62   62   64   67   69   73   76    79    82    82    81    79    79    79    78    76    75
     [,20] [,21] [,22] [,23] [,24] [,25] [,26] [,27] [,28] [,29] [,30] [,31] [,32] [,33] [,34] [,35] [,36]
[1,]    29    29    27    27    25    23    21    21    21    20    20    19    18    16    14    12    11
[2,]    44    44    44    42    41    40    41    42    41    40    39    39    38    38    37    37    36
[3,]    75    75    74    73    71    72    73    74    74    73    72    72    71    70    69    68    67
     [,37] [,38] [,39] [,40] [,41] [,42] [,43] [,44] [,45] [,46] [,47] [,48] [,49] [,50] [,51] [,52] [,53]
[1,]     9     7     7     4     3     2     2     1     1     1     0     1     1     2     0     1     1
[2,]    36    34    35    36    36    34    34    35    34    34    32    30    30    29    29    29    28
[3,]    66    64    66    69    69    65    65    67    67    66    63    61    62    59    59    59    58
     [,54] [,55] [,56] [,57] [,58] [,59] [,60] [,61] [,62] [,63] [,64]
[1,]     1     1     1     1     1     0     1     1     1     1     1
[2,]    28    28    28    28    25    25    27    28    28    26    22
[3,]    57    57    57    57    55    55    58    58    57    56    51

, , 2, 1

     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14] [,15] [,16] [,17] [,18] [,19]
[1,]   25   28   30   30   31   33   34   35   35    35    36    38    37    36    36    35    34    33    32
[2,]   36   38   40   39   40   41   44   45   47    48    49    51    51    49    48    48    48    46    45
[3,]   62   64
...

所以我要做的是将这些值转换为图像以进行绘制。我有以25为索引的图像图，根据python中的练习，该图必须如下所示（idx 25）：

您能帮我获得这个结果吗？

谢谢。