R help - Oct 2011 - converting 3D array to a data-frame (with coordinate-columns x, y, z)

Hi,


I am still struggling with three dimensional arrays.

Now I would like to convert a three dimensional array into a data-frame with the
coordinate-columns: x, y, z and a value-column.

And I definitely don't want to loop over every element, since this would be
very resource intensive for the actual data-set.


Are there any specific functions that are helpful for this task?



example-array:

x <- array(1:27, dim=c(3,3,3,1))



thanks!

reshape::melt does this I think

Michael

On Wed, Oct 5, 2011 at 12:20 PM, Martin Batholdy
<batholdy at googlemail.com> wrote:
> Hi,
>
>
> I am still struggling with three dimensional arrays.
>
> Now I would like to convert a three dimensional array into a data-frame
with the coordinate-columns: x, y, z and a value-column.
>
> And I definitely don't want to loop over every element, since this
would be very resource intensive for the actual data-set.
>
>
> Are there any specific functions that are helpful for this task?
>
>
>
> example-array:
>
> x <- array(1:27, dim=c(3,3,3,1))
>
>
>
> thanks!
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

Hi Martin, 

did you ever find a solution? I have the a similar problem because I want to
do a regression where the independent and dependent variables are matrices
of measurements. I can run loops to make each matrix one very long vector,
but I m looking for a more elegant solution. 

Thank you! Frauke





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