[R] Naming dimnames in an array using the results of an expression

[R. Michael Weylandt]

I think you may be making this too hard, but before I venture a guess,
what does your "result" object look like -- can you dput() it for us?

Looking at the line you tried:

dimnames(diag.data)<-list(names(result[1])=rownames(diag.data),names(result[[1]][2])=colnames(diag.data))

there seems to be some asymmetry in how you have the row and column
names -- is that intentional?

You might be able to try something like this:

dn <- list(c("LR","HR"), c("FALSE","TRUE"))

names(dn) <- c("Rule","Outcome")

attr(diag.data, "dimnames") <- dn

Best,
Michael

On Tue, May 22, 2012 at 1:22 PM, Dr Bob Phillips
<bob.phillips at york.ac.uk> wrote:
>
> dear all
>
> i'm struggling with naming in an array
>
> diag.data is one of a series of 2x2 diagnostic testing arrays, with
> 'Outcome' columns (true/false) and 'Test' rows (High-risk, Low-risk),
> drawn from a larger list object of 'results'
>
> i can hard-code the names of the array using dimnames;
>
> diag.data<-array(c(19,2,125,50),c(2,2)) #example to run - actually comes
> out with rownames/colnames already attached
>
> dimnames(diag.data)<-list(Rule=c("LR","HR"),Outcome=c("FALSE","TRUE"))
>
> but i would really love to be able to soft-code it, using the different
> 'rule' names and slightly different 'outcomes' as extracted from the
> main list of results, rather than just 'rule' and 'outcome' e.g.
>
> dimnames(diag.data)<-list(names(result[1])=rownames(diag.data),names(result[[1]][2])=colnames(diag.data))
>
> this doesn't work
>
> i understand that the dimnames command is NOT executing the function
> 'names' and giving me the result of this, and have struggled and failed
> to use the 'eval' expression with alternative environments (which i
> don't understand ...)
>
> can anyone assist?
>
> cheers - bob
>
>
> --
>
>
> Dr Bob Phillips
> MRC Research Training Fellow
> CRD
> University of York
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