HI,
I think your group and tps variables have a lot of levels, so the combinations
which are not there might end up as NA.
Try this:
md4<-data.frame(group=c(rep("X1",3),rep("X2",3)),tps=c("L","R","P","L","R","P"),sum=rnorm(6,15))
> md4
group tps sum
1 X1 L 13.94542
2 X1 R 14.34785
3 X1 P 15.31574
4 X2 L 14.50404
5 X2 R 13.73331
6 X2 P 14.69673
> dd <- dcast(md4, group~tps, value.var="sum")
> dd
group L P R
1 X1 13.94542 15.31574 14.34785
2 X2 14.50404 14.69673 13.73331
A.K.
----- Original Message -----
From: John Kane <jrkrid...@inbox.com>
To: r-help@r-project.org
Cc:
Sent: Tuesday, July 24, 2012 1:17 PM
Subject: [R] Simple reshape problem I am completely missing
I seem to be doing something really stupid or missing something really obvious
but what?
I have a simple three column data.frame that I would like to reshape to wide
preferably using reshape2.
An example from
http://stackoverflow.com/questions/9617348/reshape-three-column-data-frame-to-matrix
looked perfect except I wanted a data frame but it seemed okay. I just changed
acast to dcast and it seems fine.
Stackoverflow example:
tmp <- data.frame(x=gl(2,3, labels=letters[24:25]),
y=gl(3,1,6, labels=letters[1:3]),
z=c(1,2,3,3,3,2))
dd <- dcast(tmp, x~y, value.var="z")
My Example: Does NOT work
md2 <- structure(list(group = structure(c(1L, 1L, 1L, 2L, 2L, 3L, 3L,
4L, 4L, 4L, 5L, 5L, 6L, 6L, 7L, 7L, 7L, 8L, 8L), .Label = c("X1",
"X2", "X3", "X4", "X5", "X6", "X7", "X8"), class = "factor"),
tps = structure(c(7L, 12L, 14L, 4L, 8L, 9L, 16L, 6L, 7L,
11L, 6L, 15L, 10L, 13L, 3L, 4L, 5L, 1L, 2L), .Label = c("A",
"C", "D", "E", "G", "I", "L", "M", "N", "P", "Q", "R", "S",
"T", "V", "Y"), class = "factor"), sum = c(0.914913196595112,
0.0367565080432513, 0.0483302953616366, 0.982727803634948,
0.0172721963650521, 0.0483302953616366, 0.951669704638363,
0.89764100023006, 0.0850868034048879, 0.0172721963650521,
0.951669704638363, 0.0483302953616366, 0.963243491956749,
0.0367565080432513, 0.89764100023006, 0.0540287044083034,
0.0483302953616366, 0.982727803634948, 0.0172721963650521
)), .Names = c("group", "tps", "sum"), row.names = c(NA,
-19L), class = "data.frame")
dcast(md2, group ~ tps , value.vars = "sum")
What am I doing wrong?
John Kane
Kingston ON Canada
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