# [R] functions of functions

Robin Hankin r.hankin at noc.soton.ac.uk
Mon May 9 10:16:50 CEST 2005

```Yes!

perfect!

very best wishes

Robin

On May 9, 2005, at 09:13 am, Uwe Ligges wrote:

> Robin Hankin wrote:
>
>> Hello Uwe
>
[snip]

> I see, now the problem is much clearer, so what about:
>
> f <- function(foo, int, x){
>     lf <- length(foo)
>     li <- length(int)
>     l <- max(lf, li)
>     if(l > lf) foo <- rep(foo, length = l)
>     else if(l > li) int <- rep(int, length = l)
>     values <- mapply(function(foo, int)
>         do.call(foo, list(x+int)), foo, int)
>     return(rowSums(values))
> }
>
>
> Uwe
>
>
>> best wishes
>> Robin
>> On May 9, 2005, at 08:34 am, Uwe Ligges wrote:
>>> Robin Hankin wrote:
>>>
>>>> Hi
>>>> I have an application where my difficulty boils down to not
>>>> being able to define a function f() with the following properties:
>>>> f("sin",0:2,x)               #returns sin(x+0) + sin(x+1) + sin(x+2)
>>>> f(c("sin","cos"), 1:2,x)     #returns sin(x+1) + cos(x+2)
>>>> f(c("sin","cos","exp"),3,x)  #returns sin(x+3) + cos(x+3) + exp(x+3)
>>>> anyone?
>>>
>>>
>>> Not really nice, but hopefully works:
>>>

--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
tel  023-8059-7743

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