[R] Collapse an array

Benilton Carvalho bcarvalh at jhsph.edu
Thu Feb 28 21:10:18 CET 2008

dim(X) <- c(prod(dim(X)[1:3]), dim(X)[4])


On Feb 28, 2008, at 3:05 PM, Gang Chen wrote:

> Suppose I have a 4-D array X with dimensions (dx, dy, dz, dp). I want
> to collapse the first 3 dimensions of X to make a 2-D array Y with
> dimensions (dx*dy*dz, dp). Instead of awkward looping, what is a good
> way to do this? Is there a similar function like reshape in Matlab?
> Thanks,
> Gang
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