在R中，有一个Null方法可以获取矩阵的零空间。
但是，有没有R代码可以获取矩阵的行和列空间？
最佳答案
尝试orth中的nullspace和pracma package。
这是一个例子：
> library(pracma)
> m <- matrix(1:12, 2, 6)
> m
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 1 3 5 7 9 11
[2,] 2 4 6 8 10 12
> orth(m) # column space
[,1] [,2]
[1,] -0.6632348 -0.7484114
[2,] -0.7484114 0.6632348
> orth(t(m)) # row space (as columns)
[,1] [,2]
[1,] -0.08476661 -0.71876571
[2,] -0.19556039 -0.50694598
[3,] -0.30635416 -0.29512626
[4,] -0.41714794 -0.08330653
[5,] -0.52794171 0.12851320
[6,] -0.63873549 0.34033292
> nullspace(m)
[,1] [,2] [,3] [,4]
[1,] -0.3364616 -0.3421368 -0.34781203 -0.35348723
[2,] -0.1608384 0.1264967 0.41383172 0.70116676
[3,] 0.8982385 -0.0817188 -0.06167608 -0.04163337
[4,] -0.1177038 0.8420338 -0.19822864 -0.23849104
[5,] -0.1336462 -0.2342137 0.66521880 -0.43534872
[6,] -0.1495885 -0.3104611 -0.47133376 0.36779360