我有一个向量v,我想创建以下矩阵。我怎样才能在 R 中做到这一点?
v
v = c(1, 2, 3, 4) > m = matrix(c(1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4,4), nrow=4) > m [,1] [,2] [,3] [,4] [1,] 1 2 3 4 [2,] 1 2 3 4 [3,] 1 2 3 4 [4,] 1 2 3 4
See ?matrix和nrow, ncol, byrow论点:
?matrix
nrow
ncol
byrow
matrix(v, nrow=4, ncol=4, byrow=TRUE) # [,1] [,2] [,3] [,4] #[1,] 1 2 3 4 #[2,] 1 2 3 4 #[3,] 1 2 3 4 #[4,] 1 2 3 4