list 如何在R中创建矩阵列表
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How to create a list of matrix in R
提问by ManInMoon
I want to create a list of 2D matrices
我想创建一个二维矩阵列表
> x
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10
> y
[,1] [,2]
[1,] 301 306
[2,] 302 307
[3,] 303 308
[4,] 304 309
[5,] 305 310
> MATS<-c(x,y)
> MATS[1]
[1] 1
I would like to be able to refer to MATS[1] as if it where x...
我希望能够引用 MATS[1] 就好像它在 x...
采纳答案by Jilber Urbina
Try
尝试
x <- matrix(1:10, ncol=2)
y <- x+300
MATS <- list(x, y) # use 'list' instead of 'c' to create a list of matrices
MATS
[[1]]
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10
[[2]]
[,1] [,2]
[1,] 301 306
[2,] 302 307
[3,] 303 308
[4,] 304 309
[5,] 305 310
Here you have to refer to MATS[[1]]as if it were x
在这里你必须参考，MATS[[1]]好像它是x
If you want to append a new matrix to the exiting list try
如果要将新矩阵附加到现有列表中，请尝试
z <- x+500
MATS[[3]] <- z # appeding a new matrix to the existing list
MATS
[[1]]
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10
[[2]]
[,1] [,2]
[1,] 301 306
[2,] 302 307
[3,] 303 308
[4,] 304 309
[5,] 305 310
[[3]]
[,1] [,2]
[1,] 501 506
[2,] 502 507
[3,] 503 508
[4,] 504 509
[5,] 505 510
One drawback of this approach is that you have to know the position in the list where you have to append the new matrix, if you don't know it or simply if you dont want this approach, then here's a trick:
这种方法的一个缺点是您必须知道列表中必须附加新矩阵的位置，如果您不知道或者只是不想使用这种方法，那么这里有一个技巧：
unlist(list(MATS, list(z)), recursive=FALSE) # will give u the same list :D
