[R] Saving a 3d array into a matlab file

[Minho Chae]

Dear R users,

I am tryting to save an 3d array to a matlab file like the following.

A <- array(1:24, c(2,3,4))
writeMat(filename, A=A)

But if I load the mat file from Matlab, it is not 3d matrix anymore.
Does anyone know how I can preserve the 3d structure?
Any help will be greatly appreciated.

Minho Chae

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[Henrik Bengtsson]

Hi,

On Tue, Oct 28, 2008 at 2:25 PM, Minho Chae <minho...@gmail.com> wrote:
> Dear R users,
>
> I am tryting to save an 3d array to a matlab file like the following.
>
> A <- array(1:24, c(2,3,4))
> writeMat(filename, A=A)
>
> But if I load the mat file from Matlab, it is not 3d matrix anymore.
> Does anyone know how I can preserve the 3d structure?
> Any help will be greatly appreciated.

This is a bug that I'll have to look into. The dimension seems to get
lost. I'll also have to fix an earlier problem with writeMat()
existing in R.matlab v1.2.2 and later. See archive how to install the
latest stable version v1.2.1. In the meanwhile you can do something
like:

writeMat(filename, list(A=A, dim=dim(A)))

and reassign the dimension manually in Matlab (I don't know how that's
done though).

FYI, readMat() is way more stable/tested than writeMat(). The only
redundancy tests I can do on writeMat() is to try to read the data
back in using readMat(). I have little time to load writeMat()
written *.MAT files in Matlab.

/Henrik

[Henrik Bengtsson]

Hi, a follow up on this: I've fixed the below bug in writeMat().
R.matlab v1.2.4 is now available on CRAN. Please update.

Henrik