我有以下问题。我有一个 data.table 和 columns 的子集M。x我在 上定义了向量M。
library(data.table)
data <- matrix(c(0,0,NA,1,0,1,NA,1,0,0,1,0,1,1,NA,NA,1,0,0,1,0,0,1,1,1,0,0,1,NA,0,1,1,0,1,1,1), byrow = T, ncol = 6, dimnames = LETTERS[1:6])
dt <- data.table(data)
dt
% A B C D E F
% 1: 0 0 NA 1 0 1
% 2: NA 1 0 0 1 0
% 3: 1 1 NA NA 1 0
% 4: 0 1 0 0 1 1
% 5: 1 0 0 1 NA 0
% 6: 1 1 …