R help - Aug 2010 - stats::reshape question

Hello,

A quick question for my edification.  When I run the following (R 2.8.1 on
Microsoft Windows):
> d = data.frame(x1=c(1,2),x2=c(3,4),y1=c(5,6),y2=c(7,8))
>
reshape(d,varying=c("y1","x1","y2","x2"),v.names=c("y","x"),dir="long")
I found myself surprised by the results--the column labeled "y" is
actually
the data from "x1" and "x2", and the column labeled
"x" is actually the data
from "y1" and "y2".

Is this behaviour of reshape as intended?  That is, have I missed something
in the documentation?

Many thanks for any comments.

--Krishna

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It seems that we can't change the order of varying argument or v.names.

"Notice that the order of variables in varying is like x.1,y.1,x.2,y.2.
"

Code can only be:
reshape(d,varying=c("x1","y1","x2","y2"),v.names=c("x","y"),dir="long")

-----
A R learner.
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Hi:

Is this what you were aiming for?

reshape(d,varying=list(c("x1","x2"),
c("y1","y2")),v.names=c("x","y"),dir="long")
    time x y id
1.1    1 1 5  1
2.1    1 2 6  2
1.2    2 3 7  1
2.2    2 4 8  2

HTH,
Dennis

On Fri, Aug 6, 2010 at 10:28 AM, Krishna Tateneni
<tateneni@gmail.com>wrote:
> Hello,
>
> A quick question for my edification.  When I run the following (R 2.8.1 on
> Microsoft Windows):
>
> > d = data.frame(x1=c(1,2),x2=c(3,4),y1=c(5,6),y2=c(7,8))
> >
reshape(d,varying=c("y1","x1","y2","x2"),v.names=c("y","x"),dir="long")
>
> I found myself surprised by the results--the column labeled "y"
is actually
> the data from "x1" and "x2", and the column labeled
"x" is actually the
> data
> from "y1" and "y2".
>
> Is this behaviour of reshape as intended?  That is, have I missed something
> in the documentation?
>
> Many thanks for any comments.
>
> --Krishna
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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