# [R] naming rows/columns in 'array of matrices' | solved

David L Carlson dcarlson at tamu.edu
Sat Jan 31 21:11:25 CET 2015

```You can also add names to the dimensions:

> dimnames(P)[[2]] <- c("old","young")
> names(dimnames(P)) <- c("status", "age", NULL)
> P
, , 1

age
status old young
live   1     2

, , 2

age
status old young
live   5     6

David L. Carlson
Department of Anthropology
Texas A&M University

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of peter dalgaard
Sent: Saturday, January 31, 2015 2:19 AM
To: Evan Cooch
Cc: r-help at r-project.org
Subject: Re: [R] naming rows/columns in 'array of matrices' | solved

> On 30 Jan 2015, at 20:34 , Evan Cooch <evan.cooch at gmail.com> wrote:
>
> The (obvious, after the fact) solution at the bottom. D'oh...
>
[snip]
> Forgot I was dealing with a multi-dimensional array, not a list. So, following works fine. I'm sure there are better approaches (where 'better' is either 'cooler', or 'more flexible'), but for the moment...)
>
>
> P[,,1] <- matrix(c(1,2,3,4),2,2,byrow=T);
> P[,,2] <- matrix(c(5,6,7,8),2,2,byrow=T);
>
> print(P);
>

Just for completeness, this also works:

> P <- array(0, c(2,2,2))
> P[,,1] <- matrix(c(1,2,3,4),2,2,byrow=T);
> P[,,2] <- matrix(c(5,6,7,8),2,2,byrow=T);

--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com

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