[R] melting a list: basic question

[hadley wickham]

On Fri, Jul 25, 2008 at 8:50 PM, hadley wickham <h.wickham at gmail.com> wrote:
> On Fri, Jul 25, 2008 at 9:49 AM, baptiste auguie <ba208 at exeter.ac.uk> wrote:
>> Dear list,
>>
>>
>> I'm trying to use the reshape package to perform a merging operation on a
>> list of data.frames as illustrated below,
>>
>>> a <- 1:10
>>> example <- list( data.frame(a=a, b=sin(a)),  data.frame(a=a, b=cos(a)) )
>>>
>>> melt(example, id = a)
>
> You want:
>
> melt(example, id = "a")
>
> i.e. the id argument is a character or numeric vector specifying which
> variables to use as id variables.  Your call would be equivalent to
>
> melt(example, id = 1:10)
>
> which clearly is incorrect for your example.

I've just noticed that there's also a bug in the released version
(fixed in my development version) which means that the id argument to
melt.list() is not being passed on to the individual
melt.data.frame()s

Hadley

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