I have a dataframe such as
id <- c(1,1,1,2,2,3,3,3,3)
element <- c(25122,356,4454,5432,342340,12443,12354,123536,234134)
df <- data.frame(id = as.factor(id), element)
我想要创建一个包含 id
组和相应 element
的列表,例如:
dflist <- list(c(25122,356,4454), c(5432,342340), c(12443,12354,123536,234134))