Re: [R] list of matrices -- array
abind() (from package 'abind') can take a list of arrays as its first argument, so in general, no need for do.call() with abind(). As another poster pointed out, simplify2array() can also be used; while abind() gives more options regarding which dimension is created and how dimension names are constructed. x - list(A=cbind(X=c(a=1,b=2,c=3,d=4),Y=5:8,Z=9:12), B=cbind(X=c(a=13,b=14,c=15,d=16),Y=17:20,Z=21:24)) $A X Y Z a 1 5 9 b 2 6 10 c 3 7 11 d 4 8 12 $B X Y Z a 13 17 21 b 14 18 22 c 15 19 23 d 16 20 24 dim(abind(x, along=3)) [1] 4 3 2 dim(abind(x, along=1.5)) [1] 4 2 3 dim(abind(x, along=0.5)) [1] 2 4 3 dim(abind(x, along=1, hier.names=T)) # construct rownames in a hierarchical manner A.a, A.b, etc [1] 8 3 dim(abind(x, along=2, hier.names=T)) # construct colnames in a hierarchical manner [1] 4 6 abind(x, along=2, hier.names=T) A.X A.Y A.Z B.X B.Y B.Z a 1 5 9 13 17 21 b 2 6 10 14 18 22 c 3 7 11 15 19 23 d 4 8 12 16 20 24 On 2/14/2013 3:53 AM, Rolf Turner wrote: require(abind) do.call(abind,c(my_list,list(along=0))) # Gives 2 x 4 x 5 do.call(abind,c(my_list,list(along=3))) # Gives 4 x 5 x 2 The latter seems more natural to me. cheers, Rolf Turner On 02/14/2013 07:03 PM, Murat Tasan wrote: i'm somehow embarrassed to even ask this, but is there any built-in method for doing this: my_list - list() my_list[[1]] - matrix(1:20, ncol = 5) my_list[[2]] - matrix(20:1, ncol = 5) now, knowing that these matrices are identical in dimension, i'd like to unfold the list to a 2x4x5 (or some other permutation of the dim sizes) array. i know i can initialize the array, then loop through my_list to fill the array, but somehow this seems inelegant. i also know i can vectorize the matrices and unlist the list, then build the array from that single vector, but this also seems inelegant (and an easy place to introduce errors/bugs). i can't seem to find any built-in that handles this already... but maybe i just haven't looked hard enough :-/ __ R-help@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. __ R-help@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.
Re: [R] list of matrices -- array
thanks to all! didn't know about simplify2array, nor about the abind package. they're exactly what i wanted. cheers, -m On Sun, Feb 17, 2013 at 9:41 AM, Tony Plate tapl...@gmail.com wrote: abind() (from package 'abind') can take a list of arrays as its first argument, so in general, no need for do.call() with abind(). As another poster pointed out, simplify2array() can also be used; while abind() gives more options regarding which dimension is created and how dimension names are constructed. x - list(A=cbind(X=c(a=1,b=2,c=3,d=4),Y=5:8,Z=9:12), B=cbind(X=c(a=13,b=14,c=15,d=16),Y=17:20,Z=21:24)) $A X Y Z a 1 5 9 b 2 6 10 c 3 7 11 d 4 8 12 $B X Y Z a 13 17 21 b 14 18 22 c 15 19 23 d 16 20 24 dim(abind(x, along=3)) [1] 4 3 2 dim(abind(x, along=1.5)) [1] 4 2 3 dim(abind(x, along=0.5)) [1] 2 4 3 dim(abind(x, along=1, hier.names=T)) # construct rownames in a hierarchical manner A.a, A.b, etc [1] 8 3 dim(abind(x, along=2, hier.names=T)) # construct colnames in a hierarchical manner [1] 4 6 abind(x, along=2, hier.names=T) A.X A.Y A.Z B.X B.Y B.Z a 1 5 9 13 17 21 b 2 6 10 14 18 22 c 3 7 11 15 19 23 d 4 8 12 16 20 24 On 2/14/2013 3:53 AM, Rolf Turner wrote: require(abind) do.call(abind,c(my_list,list(along=0))) # Gives 2 x 4 x 5 do.call(abind,c(my_list,list(along=3))) # Gives 4 x 5 x 2 The latter seems more natural to me. cheers, Rolf Turner On 02/14/2013 07:03 PM, Murat Tasan wrote: i'm somehow embarrassed to even ask this, but is there any built-in method for doing this: my_list - list() my_list[[1]] - matrix(1:20, ncol = 5) my_list[[2]] - matrix(20:1, ncol = 5) now, knowing that these matrices are identical in dimension, i'd like to unfold the list to a 2x4x5 (or some other permutation of the dim sizes) array. i know i can initialize the array, then loop through my_list to fill the array, but somehow this seems inelegant. i also know i can vectorize the matrices and unlist the list, then build the array from that single vector, but this also seems inelegant (and an easy place to introduce errors/bugs). i can't seem to find any built-in that handles this already... but maybe i just haven't looked hard enough :-/ __ R-help@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. __ R-help@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.
Re: [R] list of matrices -- array
require(abind) do.call(abind,c(my_list,list(along=0))) # Gives 2 x 4 x 5 do.call(abind,c(my_list,list(along=3))) # Gives 4 x 5 x 2 The latter seems more natural to me. cheers, Rolf Turner On 02/14/2013 07:03 PM, Murat Tasan wrote: i'm somehow embarrassed to even ask this, but is there any built-in method for doing this: my_list - list() my_list[[1]] - matrix(1:20, ncol = 5) my_list[[2]] - matrix(20:1, ncol = 5) now, knowing that these matrices are identical in dimension, i'd like to unfold the list to a 2x4x5 (or some other permutation of the dim sizes) array. i know i can initialize the array, then loop through my_list to fill the array, but somehow this seems inelegant. i also know i can vectorize the matrices and unlist the list, then build the array from that single vector, but this also seems inelegant (and an easy place to introduce errors/bugs). i can't seem to find any built-in that handles this already... but maybe i just haven't looked hard enough :-/ __ R-help@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.
Re: [R] list of matrices -- array
On Feb 13, 2013, at 10:03 PM, Murat Tasan wrote: i'm somehow embarrassed to even ask this, but is there any built-in method for doing this: my_list - list() my_list[[1]] - matrix(1:20, ncol = 5) my_list[[2]] - matrix(20:1, ncol = 5) now, knowing that these matrices are identical in dimension, i'd like to unfold the list to a 2x4x5 (or some other permutation of the dim sizes) array. i know i can initialize the array, then loop through my_list to fill the array, but somehow this seems inelegant. i also know i can vectorize the matrices and unlist the list, then build the array from that single vector, but this also seems inelegant (and an easy place to introduce errors/bugs). i can't seem to find any built-in that handles this already... but maybe i just haven't looked hard enough :-/ I think the built-in function you seek is `simplify2array`: # gives 4 x 5 x 2 simplify2array(my_list) , , 1 [,1] [,2] [,3] [,4] [,5] [1,]159 13 17 [2,]26 10 14 18 [3,]37 11 15 19 [4,]48 12 16 20 , , 2 [,1] [,2] [,3] [,4] [,5] [1,] 20 16 1284 [2,] 19 15 1173 [3,] 18 14 1062 [4,] 17 13951 # 2 x 4 x 5 aperm( simplify2array(my_list), c(3,1,2) ) # 4 x 2 x 5 aperm( simplify2array(my_list), c(1,3,2) ) -- David Winsemius, MD Alameda, CA, USA __ R-help@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.
[R] list of matrices -- array
i'm somehow embarrassed to even ask this, but is there any built-in method for doing this: my_list - list() my_list[[1]] - matrix(1:20, ncol = 5) my_list[[2]] - matrix(20:1, ncol = 5) now, knowing that these matrices are identical in dimension, i'd like to unfold the list to a 2x4x5 (or some other permutation of the dim sizes) array. i know i can initialize the array, then loop through my_list to fill the array, but somehow this seems inelegant. i also know i can vectorize the matrices and unlist the list, then build the array from that single vector, but this also seems inelegant (and an easy place to introduce errors/bugs). i can't seem to find any built-in that handles this already... but maybe i just haven't looked hard enough :-/ cheers, -m __ R-help@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.
Re: [R] list of matrices -- array
FYI - this is my current method, but somehow i just don't like it ;-)
foo - array(NA, dim = c(4,5,length(my_list)))
for(k in 1:length(my_list)) {
foo[,,k] - my_list[[k]]
}
-m
On Thu, Feb 14, 2013 at 1:03 AM, Murat Tasan mmu...@gmail.com wrote:
i'm somehow embarrassed to even ask this, but is there any built-in
method for doing this:
my_list - list()
my_list[[1]] - matrix(1:20, ncol = 5)
my_list[[2]] - matrix(20:1, ncol = 5)
now, knowing that these matrices are identical in dimension, i'd like
to unfold the list to a 2x4x5 (or some other permutation of the dim
sizes) array.
i know i can initialize the array, then loop through my_list to fill
the array, but somehow this seems inelegant.
i also know i can vectorize the matrices and unlist the list, then
build the array from that single vector, but this also seems inelegant
(and an easy place to introduce errors/bugs).
i can't seem to find any built-in that handles this already... but
maybe i just haven't looked hard enough :-/
cheers,
-m
__
R-help@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.
Re: [R] list of matrices -- array
Hi,
May be this helps:
library(plyr)
res-aaply(laply(my_list, as.matrix),c(2,3),function(x) x)
attr(res,dimnames)- NULL
identical(res,foo)
#[1] TRUE
A.K.
- Original Message -
From: Murat Tasan mmu...@gmail.com
To: r-help@r-project.org
Cc:
Sent: Thursday, February 14, 2013 1:13 AM
Subject: Re: [R] list of matrices -- array
FYI - this is my current method, but somehow i just don't like it ;-)
foo - array(NA, dim = c(4,5,length(my_list)))
for(k in 1:length(my_list)) {
foo[,,k] - my_list[[k]]
}
-m
On Thu, Feb 14, 2013 at 1:03 AM, Murat Tasan mmu...@gmail.com wrote:
i'm somehow embarrassed to even ask this, but is there any built-in
method for doing this:
my_list - list()
my_list[[1]] - matrix(1:20, ncol = 5)
my_list[[2]] - matrix(20:1, ncol = 5)
now, knowing that these matrices are identical in dimension, i'd like
to unfold the list to a 2x4x5 (or some other permutation of the dim
sizes) array.
i know i can initialize the array, then loop through my_list to fill
the array, but somehow this seems inelegant.
i also know i can vectorize the matrices and unlist the list, then
build the array from that single vector, but this also seems inelegant
(and an easy place to introduce errors/bugs).
i can't seem to find any built-in that handles this already... but
maybe i just haven't looked hard enough :-/
cheers,
-m
__
R-help@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.
__
R-help@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.
