[R] reshape package cast() function

[Ista Zahn]

Hi all,
I think I'm cracking up. Please help me understand why I'm getting
different results with m.test and m.test2 in the example below.

> library(reshape)
Loading required package: plyr
>
> m.test <- data.frame(id = factor(rep(1:10, 2)), variable=rep(c("var1","var2"),10), value=rnorm(20))
> cast(m.test, ...~variable, value="value") ## cast is aggregating even though I have ... in the formula.
Aggregation requires fun.aggregate: length used as default
   id var1 var2
1   1    2    0
2   2    0    2
3   3    2    0
4   4    0    2
5   5    2    0
6   6    0    2
7   7    2    0
8   8    0    2
9   9    2    0
10 10    0    2
>
> test2 <- data.frame(id=factor(1:10), var1=rnorm(10), var2=rnorm(1))
> m.test2 <- melt(test2, id="id")
> cast(m.test2, ...~variable, value="value") ## this is the result I want. I don't understand why I'm not getting the same thing for m.test.
   id        var1      var2
1   1  0.19829479 -0.642097
2   2  0.37971900 -0.642097
3   3 -0.23557248 -0.642097
4   4  0.12969246 -0.642097
5   5 -0.12019995 -0.642097
6   6  0.09744247 -0.642097
7   7 -1.24467558 -0.642097
8   8  1.69505449 -0.642097
9   9  1.60714925 -0.642097
10 10  0.11961170 -0.642097

Thanks,
-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org