Re: [R] melting a list: basic question

From: hadley wickham <h.wickham_at_gmail.com>
Date: Fri, 25 Jul 2008 20:50:25 -0500

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.

Hadley

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

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Received on Sat 26 Jul 2008 - 01:52:46 GMT

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