[R] lapply / mapply and assignments

[Gabor Grothendieck]

Try:  mapply(..., SIMPLIFY = FALSE)

On Mon, Oct 12, 2009 at 5:25 PM, Magnus Torfason <zulutime.net at gmail.com> wrote:
> I have a list of isometric structures, and I want to change the same part of
> each structure in the list, assigning one element of a vector to each of
> these parts.
>
> In other words, I want to achieve the following:
>
>> l <- list( list(a=1,b=2), list(a=3,b=4))
>> unlist(lapply(l, "[[", "a"))
> [1] 1 3
>>
>> # This will not actually work
>> l[[]]["a"] <- 5:6
>>
>> unlist(lapply(l, "[[", "a"))
> [1] 5 6
>
> I figure mapply is the solution to the problem, and I tried the following:
>
>> mapply( "[<-", l, "a", 5:6)
>
> But the result is not the same shape as the original.
>
> Any thoughts?
>
> Best,
> Magnus
>
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