[R] (hopefully) simple array op

baptiste auguie ba208 at exeter.ac.uk
Wed Apr 15 20:46:12 CEST 2009


Do you want abind?

http://cran.r-project.org/web/packages/abind/index.html

baptiste

On 15 Apr 2009, at 19:33, Cable, Samuel B Civ USAF AFMC AFRL/RVBXI  
wrote:

> I have a multidimensional array "a", for example,
>
>> a
> , , 1
>
>     [,1] [,2]
> [1,]    1    3
> [2,]    2    4
>
> , , 2
>
>     [,1] [,2]
> [1,]    5    7
> [2,]    6    8
>
> So a is 2x2x2.
>
> I have another array "b", for example,
>
>> b
>     [,1] [,2]
> [1,]    9   11
> [2,]   10   12
>
> So b is 2x2.
>
> I want to "tack" b onto a so that b becomes a new "plane", so to  
> speak,
> in a.  In other words, I want the result c to be:
>
>> c
> , , 1
>
>     [,1] [,2]
> [1,]    1    3
> [2,]    2    4
>
> , , 2
>
>     [,1] [,2]
> [1,]    5    7
> [2,]    6    8
>
> , , 3
>
>     [,1] [,2]
> [1,]    9   11
> [2,]   10   12
>
> I can think of a number of ways to do this, but they are all  
> cumbersome.
> Given R's facility with arrays and indices, it occurs to me that there
> might be some "one-line" way to accomplish this.  Does anyone know if
> there is?  Thanks.
>
> --Sam
>
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_____________________________

Baptiste Auguié

School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK

Phone: +44 1392 264187

http://newton.ex.ac.uk/research/emag



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