[R] Setting matrix dimnames in a list

[jim holtman]

I think what you want is this -- you have to return 'x' from the lapply:

x <- matrix(1:4,2)
y <- matrix(5:8,2)

z <- list(x,y)
nm <- c("a","b")
nms <- list(nm,nm)

z <- lapply(z,function(x){
    dimnames(x)<-nms
    x
})

On Thu, May 8, 2008 at 1:33 PM, statmobile <statmobile at gmail.com> wrote:
> Hey All,
>
> I was wondering if I could solicit a little input on what I'm trying to do
> here.  I have a list of matrices, and I want to set their dimnames, but all
> I can come up with is this:
>
> x <- matrix(1:4,2)
> y <- matrix(5:8,2)
>
> z <- list(x,y)
> nm <- c("a","b")
> nms <- list(nm,nm)
>
> z <- lapply(z,function(x)dimnames(x)<-nms)
>
> As you can see, this doesn't quite work.  Could anybody help me, and bonus
> points if you can help me do this efficiently.  Please cc my email address,
> because I only get summaries of the list.
>
> Thanks in advance!
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?