Split a vector into three vectors of unequal length in R -

a questions relative n00b: i’d split vector 3 vectors of different lengths, values assigned each vector @ random. example, i’d split vector of length 12 below vectors of length 2,3, , 7

i can 3 equal sized vectors using this:

test<-1:12 split(test,sample(1:3)) 

any suggestions on how split test vectors of 2,3, , 7 instead of 3 vectors of length 4?

you use rep create indices each group , split based on that

split(1:12, rep(1:3, c(2, 3, 7))) 

if wanted items randomly assigned it's not first 2 items in first vector, next 3 items in second vector, ..., add call sample

split(1:12, sample(rep(1:3, c(2, 3, 7)))) 

if don't have specific lengths (2,3,7) in mind don't want equal length vectors every time simono101's answer way go.