将矩阵连接成数组 [英] joining matrices into an array

问题描述

我有几种矩阵，希望将它们按如下方式加入到数组中:

I have several matrices that i would like to join them into an array as follows:

> mat1
     [,1] [,2] [,3]
[1,]    1    3    5
[2,]    2    4    6

> mat2
     [,1] [,2] [,3]
[1,]    1    3    5
[2,]    2    4    6

> mat3
     [,1] [,2] [,3]
[1,]   13   15   17
[2,]   14   16   18

我已经尝试过了:

dime=dim(mat1)
Array=array(mat1, mat2,mat3,dim(dime))

出现以下错误:

Error in array(mat1, mat2, mat3, dim(dime)) : 
  unused argument(s) (dim(dime))

我可能做错了什么?

推荐答案

更新:

从注释中看来，所需要做的只是cbind这三个矩阵:

> cbind(mat1, mat2, mat3)
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
[1,]    1    3    5    1    3    5    1    3    5
[2,]    2    4    6    2    4    6    2    4    6

我想如果您有很多这样的东西，将它们安排在一个列表中，然后使用do.call一起将它们cbind组合在一起是很有意义的:

I suppose that if you have a lot of these, it would make sense to arrange for them to held in a list and then use do.call to cbind them together:

mlist <- list(mat1, mat2, mat3) ## simulate matrices stored as a list

## cbind them via a `do.call` call
do.call(cbind, mlist)

产生

> do.call(cbind, mlist)
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
[1,]    1    3    5    1    3    5    1    3    5
[2,]    2    4    6    2    4    6    2    4    6

原始

还不清楚您希望矩阵如何排列在数组中.如果您要像一堆纸一样堆叠矩阵，并且每张纸都是一个矩阵，那么我们可以简单地将矩阵与c连接为单个向量，然后将其与相应的dim传递给array争论.例如

Original

It isn't really very clear how you want the matrices to be arrange in the array. If you mean to stack the matrices like a pile of papers, with each leaf of paper a matrix, then we can simply concatenate the matrices into a single vector with c and then pass that to array with an appropriate dim argument. E.g.

> mat1 <- mat2 <- mat3 <- matrix(1:6, ncol = 3)
> array(c(mat1, mat2, mat3), dim = c(2,3,3))
, , 1

     [,1] [,2] [,3]
[1,]    1    3    5
[2,]    2    4    6

, , 2

     [,1] [,2] [,3]
[1,]    1    3    5
[2,]    2    4    6

, , 3

     [,1] [,2] [,3]
[1,]    1    3    5
[2,]    2    4    6

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