相关疑难解决方法(0)

我有以下要执行多列合并的data.table：

# Load library
library(data.table)

# Dummy data set
dt <- data.table(a = 1:10,
                 t_alpha = runif(10),
                 t_beta = runif(10),
                 t_gamma = runif(10),
                 s_alpha = runif(10),
                 s_beta = runif(10),
                 s_gamma = runif(10))

# Look at data table
dt
#>      a    t_alpha    t_beta    t_gamma    s_alpha     s_beta   s_gamma
#>  1:  1 0.73315322 0.7777962 0.13258401 0.12841353 0.20865995 0.8967482
#>  2:  2 0.10161042 0.9691244 0.23506277 0.35130324 0.36672933 0.9247026
#>  3:  3 0.95234142 0.7002526 0.07104051 0.85558314 0.39467530 0.8982107
#>  4:  4 0.48967202 0.3951288 …