[R] Help with reshaping data.frame

[davidr at rhotrading.com]

I'm having trouble reshaping a data.frame from long to wide.
(I think that's the right terminology; feel free to educate me.)
I've looked at the reshape function and package and plyr package,
but I can't quite figure out how to do this after a dozen variations.
 
I have a data.frame with more levels than this, but similar to:

> tst
   K1 K2 K3   V1 V2  V3
1  10  D  a 0.08 99 105
2  20  D  a 0.00 79 522
3  30  D  a 0.31 70 989
5  20  E  a 0.08 73 251
6  30  E  a   NA 38 323
7  10  D  b   NA 76 775
8  20  D  b 0.26 84 372
9  30  D  b 0.24 51 680
10 10  E  b 0.11 85 532
12 30  E  b 0.07 20 364
> dput(tst)
structure(list(K1 = c(10, 20, 30, 20, 30, 10, 20, 30, 10, 30), 
    K2 = structure(c(1L, 1L, 1L, 2L, 2L, 1L, 1L, 1L, 2L, 2L), .Label =
c("D", 
    "E"), class = "factor"), K3 = structure(c(1L, 1L, 1L, 1L, 
    1L, 2L, 2L, 2L, 2L, 2L), .Label = c("a", "b"), class = "factor"), 
    V1 = c(0.08, 0, 0.31, 0.08, NA, NA, 0.26, 0.24, 0.11, 0.07
    ), V2 = c(99, 79, 70, 73, 38, 76, 84, 51, 85, 20), V3 = c(105, 
    522, 989, 251, 323, 775, 372, 680, 532, 364)), .Names = c("K1", 
"K2", "K3", "V1", "V2", "V3"), row.names = c(1L, 2L, 3L, 5L, 
6L, 7L, 8L, 9L, 10L, 12L), class = "data.frame")
> str(tst)
'data.frame':   10 obs. of  6 variables:
 $ K1: num  10 20 30 20 30 10 20 30 10 30
 $ K2: Factor w/ 2 levels "D","E": 1 1 1 2 2 1 1 1 2 2
 $ K3: Factor w/ 2 levels "a","b": 1 1 1 1 1 2 2 2 2 2
 $ V1: num  0.08 0 0.31 0.08 NA NA 0.26 0.24 0.11 0.07
 $ V2: num  99 79 70 73 38 76 84 51 85 20
 $ V3: num  105 522 989 251 323 775 372 680 532 364

I want a data.frame with columns K1, D.a.V1, D.a.V2, D.a.V3, D.b.V1,
D.b.V2, ..., E.b.V3,
with NA's where there is missing data.

Any direction would be appreciated. sessionInfo() below.

Thanks,
David L. Reiner
Rho Trading Securities, LLC


> sessionInfo()
R version 2.9.1 (2009-06-26) 
i386-pc-mingw32 

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base


other attached packages:
[1] reshape_0.8.3 plyr_0.1.9   

loaded via a namespace (and not attached):
[1] tools_2.9.1



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