[R] Simple reshape problem I am completely missing

John Kane jrkrideau at inbox.com
Tue Jul 24 20:17:40 CEST 2012

```Looks like it. thanks

Now all I have to do is figgure out how to get rid of all the missing combos.  Oh well another dat
thanks

John Kane

> -----Original Message-----
> From: smartpink111 at yahoo.com
> Sent: Tue, 24 Jul 2012 10:45:18 -0700 (PDT)
> To: jrkrideau at inbox.com
> Subject: Re: [R] Simple reshape problem I am completely missing
>
> 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 <jrkrideau at inbox.com>
> To: r-help at 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
>
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