[R] "Matrix' with Functions

[Claudia Beleites]

Seems funny to me:

 > f <- list (mean, sd, median, sum)
 > dim (f) <- c (2, 2)

or in one line:
 > f <- structure (.Data=list (mean, sd, median, sum), dim = c(2,2))
 > f
      [,1] [,2]
[1,] ?    ?
[2,] ?    ?
 > f [1,1]
[[1]]
function (x, ...)
UseMethod("mean")
<environment: namespace:base>

 > f [[1,1]] (1:3)
[1] 2
 > f [[2,1]] (1:3)
[1] 1
 > f [[1,2]] (1:3)
[1] 2
 > f [[2,2]] (1:3)
[1] 6

HTH

Claudia



On 02/03/2011 05:33 PM, Alaios wrote:
> Dear R members,
> I have a quite large of function that are named like that
> f11,f12,...f15
> f21,f22,...f25
> ..
> f51,f52,...f52
>
> These are static (hard-coded) functions that the only common they have is that they take the same number and type of input fij(a,b,c,d). As you might understand this is really close to the notion of matrix only that my 'matrix' contains functions. It would be great if I can address all these function using a numbering-scheme like F(i,j) where for example
> F(1,1) will return the f11(a,b,c,d,).
>
> I am sure that this might be quite complex to implement so could you please refer me to some book/tutorial that addresses this kind of topics?
>
> I would like to thank you in advance for your help
> Best Regards
> Alex
>
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-- 
Claudia Beleites
Dipartimento dei Materiali e delle Risorse Naturali
Università degli Studi di Trieste
Via Alfonso Valerio 6/a
I-34127 Trieste

phone: +39 0 40 5 58-37 68
email: cbeleites at units.it