list R：将列表的元素拆分为子列表
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R: split elements of a list into sublists
提问by Markus
I have a data frame with following structure:
我有一个具有以下结构的数据框：
pat <- c(rep(1,50), rep(2,50), rep(3,50))
inc <- rep(c(rep(1,5), rep(2,5), rep(3,5), rep(4,5), rep(5,5),
rep(6,5), rep(7,5), rep(8,5), rep(9,5), rep(10,5)), 3)
df <- data.frame(cbind(pat, inc))
df is split into a list of elements:
df 被拆分为一个元素列表：
all.inc = split(df, inc)
Now I want to split each element of this list into sub-lists. Something like:
现在我想将此列表的每个元素拆分为子列表。就像是：
all.pat = split(all.inc, pat)
This doesn't work, obviously. I've already tried the plyrfunctions and lapply, but didn't get it to work.
这显然行不通。我已经尝试了plyr功能和lapply，但没有让它工作。
Any ideas?
有任何想法吗？
采纳答案by A5C1D2H2I1M1N2O1R2T1
Use lapply:
使用lapply：
lapply(all.inc, function(x) split(x, x$pat))
回答by BenBarnes
If you'd like to split your data frame all at once, you could use
如果你想一次拆分你的数据框，你可以使用
split(df, interaction(df$pat,df$inc))
However, the returned value will be a single list of data frames, which is slightly different from what you would get by splitting list elements.
但是，返回值将是单个数据框列表，这与拆分列表元素所得到的值略有不同。
