[R] How to unstack three columns into rows?

PIKAL Petr petr.pikal at precheza.cz
Tue May 27 13:46:13 CEST 2014


Hi

cast(data, siteS~species)

gives you quite close result, only row ordering is different

Regards
Petr


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Kristi Glover
> Sent: Tuesday, May 27, 2014 12:54 PM
> To: R-help
> Subject: [R] How to unstack three columns into rows?
>
> Dear R User,
> I was wondering how I can unstack my data. For example I have following
> data set
>
> data<-structure(list(siteS = structure(c(3L, 3L, 3L, 4L, 4L, 5L, 5L,
> 5L, 5L, 5L, 1L, 1L, 1L, 2L), .Label = c("11a", "12d", "1a", "2v",
> "6a"), class = "factor"), species = structure(c(1L, 2L, 3L, 1L, 4L, 1L,
> 4L, 5L, 2L, 3L, 1L, 6L, 3L, 1L), .Label = c("sa", "sb", "sc", "sd",
> "se", "sg"), class = "factor"), abundance = c(31L, 55L, 62L, 42L, 40L,
> 30L, 84L, 10L, 23L, 74L, 11L, 51L, 37L, 15L )), .Names = c("siteS",
> "species", "abundance"), class = "data.frame", row.names = c(NA,
> -14L))
>
> I wanted to have this data into following format
>
> newData<-structure(list(siteS = structure(c(3L, 4L, 5L, 1L, 2L), .Label
> = c("11a", "12d", "1a", "2v", "6a"), class = "factor"), sa = c(31L,
> 42L, 30L, 11L, 15L), sb = c(55L, NA, 84L, NA, NA), sc = c(62L, NA, 10L,
> 37L, NA), sd = c(NA, 40L, 23L, NA, NA), se = c(NA, NA, 74L, NA, NA), sg
> = c(NA, NA, NA, 51L, NA)), .Names = c("siteS", "sa", "sb", "sc", "sd",
> "se", "sg"), class = "data.frame", row.names = c(NA,
> -5L))
>
> I tried several ways such as:
> > data.frame(unstack(data, species~siteS))
> Error in data.frame(`11a` = c("sa", "sg", "sc"), `12d` = "sa", `1a` =
> c("sa",  :
>   arguments imply differing number of rows: 3, 1, 2, 5
>
>
>
>       [[alternative HTML version deleted]]
>
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