Re: [R] melting a list: basic question

From: hadley wickham <h.wickham_at_gmail.com>
Date: Fri, 25 Jul 2008 20:52:00 -0500

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@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

-- 
http://had.co.nz/

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Received on Sat 26 Jul 2008 - 01:53:55 GMT

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