[R] Errors melt()ing data...

[Neil Shephard]

Hi Hadley,

On Thu, Feb 28, 2008 at 1:15 PM, hadley wickham <h.wickham at gmail.com> wrote:
>
>  I think the problem is that reshape adds some extra information to the
>  cast data.frame, but this info is no longer relevant when you've
>  removed some of the columns.  Try as.data.frame to strip off this
>  extra info.
>
>   t <- melt(subset(as.data.frame(t.norm1), select= c("Sample.Name",
> "SNP", "Pool", "polar.1", "polar.2")), id=c("Sample.Name", "SNP"))
>

Thats done the trick, thank you very much.

>  (Also, can't you get to cast.height.norm1 directly from norm1 ?
>  cast.height.norm1 <- cast(norm1, SNP ~ Sample.Name + variable, sum)

Yep, you can, but I need t.norm1 as an intermediate for deriving
polar.1 and polar.2 for each Sample.Name and SNP, although I wouldn't
be surprised if this can be done at the same time, as your reshape()
package is exceptionally flexible (and as you can probably tell, I'm
still climbing the R learning curve!).

In fact I think I shall sit down and work out how to do this!

Thanks for your help (again),

Neil
-- 
Email - nshephard at gmail.com / n.shephard at sheffield.ac.uk