[R] Splitting a vector

[Long Vo]

This does what I needed. However, as the output is a list object, is there
any way to apply a function to such object? For example if I want to compute
the mean for the 4th subvectors, I can't simply use:
#####
Y=split(X,as.numeric(gl(length(X),3,length(X))))
mean(Y[4])
##### 
as the error message shows "argument is not numeric or logical"



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