
Did you melt first?

library(reshape2)
?melt

> Date: Tue, 24 Jul 2012 09:17:08 -0800
> From: jrkrideau@inbox.com
> To: r-help@r-project.org
> 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
> 
> ____________________________________________________________
> FREE ONLINE PHOTOSHARING - Share your photos online with your friends and family!
> Visit http://www.inbox.com/photosharing to find out more!
> 
> ______________________________________________
> 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.
 		 	   		  
	[[alternative HTML version deleted]]

