[R] Splitting a vector

[Long Vo]

Hi, I am quite new to R so I know that this probably is very basic , but how
can I split a sequence of number into multiple parts with equal length?
For example I have a vector

X=c(1:12)
I simply need to split it into sub-vectors with the same length N . Say N=3
then I need the output to be like 
1 2 3
4 5 6
7 8 9
10 11 12

And better if the sub-vectors can be named so that I can use them later for
individual study, probably a do-loop in which a function can be applied to
them.
I just want them to be in consecutive order so really no fancy conditions
here.  

Any helps to this amateur is greatly appreciated,
Long



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