[R] dynamically creating functions in r

[Duncan Murdoch]

On 05/10/2011 10:57 AM, honeyoak wrote:
> it is possible to dynamically create functions in R using lists? what I want
> to do is something like this:
>
>        a = list()
>        for (i in 1:10) a[[i]] = function(seed = i) runif(seed)
>
> so that when I call a[i] I get random draws 1,2,....i unfortunately R only
> uses the last i .


That is because you never evaluate it until you call the function.  You 
can do what you want in several ways; one is

for (i in 1:10)
   a[[i]] <- local( { default <- i; function(seed = default) runif(seed) } )

Duncan Murdoch
>   I would also like to know if there is a run-all function
> without explicitly looping or using lapply. for example if I have a list 'b'
> of functions if I called
>
>        run-all(b)
>
> all the functions in list 'b' would be run
>
> thanks.
>
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