R help - Feb 2012 - fill an array by rows

I've dug around but not been able to find anything, am probably missing 
something obvious.

How can I fill a three-dimensional (or higher dimension) array by rows 
instead of columns.

eg

new1 <- array(c(1:125), c(5,5,5))

works fine for me but fills it by columns and

new2 <- array(c(1:125), c(5,5,5), byrow=TRUE)

throws an error.

Am I missing something obvious?  I also tried transposing the 3-d array 
but that didn't work either.

TIA

Jim

-- 
Dr. Jim Maas
University of East Anglia

Use aperm on the output of array:
  > aperm(array(1:8, dim=c(2,2,2)), perm=c(2,1,3))
  , , 1
  
       [,1] [,2]
  [1,]    1    2
  [2,]    3    4

  , , 2

       [,1] [,2]
  [1,]    5    6
  [2,]    7    8

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com 
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at
r-project.org] On Behalf Of Jim Maas
> Sent: Thursday, February 09, 2012 9:47 AM
> To: r-help at r-project.org
> Subject: [R] fill an array by rows
> 
> I've dug around but not been able to find anything, am probably missing
> something obvious.
> 
> How can I fill a three-dimensional (or higher dimension) array by rows
> instead of columns.
> 
> eg
> 
> new1 <- array(c(1:125), c(5,5,5))
> 
> works fine for me but fills it by columns and
> 
> new2 <- array(c(1:125), c(5,5,5), byrow=TRUE)
> 
> throws an error.
> 
> Am I missing something obvious?  I also tried transposing the 3-d array
> but that didn't work either.
> 
> TIA
> 
> Jim
> 
> --
> Dr. Jim Maas
> University of East Anglia
> 
> ______________________________________________
> 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.

On Feb 9, 2012, at 12:47 PM, Jim Maas wrote:
> I've dug around but not been able to find anything, am probably  
> missing something obvious.
>
> How can I fill a three-dimensional (or higher dimension) array by  
> rows instead of columns.
>
> eg
>
> new1 <- array(c(1:125), c(5,5,5))
>
> works fine for me but fills it by columns and
>
> new2 <- array(c(1:125), c(5,5,5), byrow=TRUE)
>
> throws an error.
>
> Am I missing something obvious?  I also tried transposing the 3-d  
> array but that didn't work either.
You might want to look at aperm:

  Perhaps:
new2 <- aperm(new1, c(2,1,3))

>
-- 

David Winsemius, MD
West Hartford, CT