[R] character -> list

[Liaw, Andy]

Use as.data.frame() on the matrix.

HTH,
Andy

> From: David Andel
> 
> Hi
> 
> I have a matrix of type "character" (strangly) and am trying to apply 
> the function "aggregate" to it, but unfortunately without success.
> It seems to me that aggregate would work, if I only could get 
> rid of the 
> quotation marks around each item.
> 
> So for a very simple example which looks as my actual data look (of 
> course here I put the quotation marks on purpose, but I have no idea 
> where they come from in my actual data):
> 
>  > x <- matrix(c("a","b","1","a","c","3","b","b","2"), nr=3, byrow=T, 
> dimnames=list(1:3, c("type","group","value")))
>  > x
>    type group value
> 1 "a"  "b"   "1"
> 2 "a"  "c"   "3"
> 3 "b"  "b"   "2"
> 
> I can't access the columns the way I think would be necessary for 
> aggregate to work:
>  > x$type
> NULL
> 
> And this seems to be the problem:
>  > typeof(x)
> [1] "character"
> 
> I think I would need to have type "list" to be able to apply 
> "aggregate".
> 
> How can I accomplish this?
> 
> Thanks,
> David
> 
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