[R] Spliting a huge vector

From: Dave Evens <devens8765_at_yahoo.com>
Date: Wed 20 Sep 2006 - 21:19:04 GMT

Dear R users,

I have a huge vector that I would like to split into unequal slices. However, the only way I can do this is to create another huge vector to define the groups that are used to split the original vector, e.g.

# my vector is this

a.vector <- seq(2, by=5, length=100)

# indices where I would like to slice my vector
cut.values <- c(30, 50, 100, 109, 300, 601, 803)

# so I have to create another vector of similar length
# to use the split() command, i.e.


x <- rep(1:length(cut.values), times=diff(c(0, cut.values))

# this means I can use split()

split(a.vector, x)

This seems to be a waste in terms of memory usage as I'm creating another vector (here "x") to split the original vector. Is there a better way to split a huge vector than this? Any help is much appreciated.

Best,
Dave.



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