[R] How to copy and paste a row at the end of each group of a table?

PIKAL Petr petr.pikal at precheza.cz
Mon Oct 31 14:42:07 CET 2016 

Hi

Another approach is to use function like following

fff<-function(x, ...) {
temp <- x[which(x[,"day"]==1),]
temp$day <- 361
x <- rbind(x, temp)
x[order(x$site, x$day),]
}

fff(dat)

Cheers
Petr

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of jim
> holtman
> Sent: Monday, October 31, 2016 2:10 PM
> To: Kristi Glover <kristi.glover at hotmail.com>
> Cc: r-help at r-project.org
> Subject: Re: [R] How to copy and paste a row at the end of each group of a
> table?
>
> try this:
>
> > dat<-structure(list(site = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,
> + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2), day = c(1, 31, 61, 91, 121,
> + 151, 181, 211, 241, 271, 301, 331, 1, 31, 61, 91, 121, 151, 181,
> + 211, 241, 271, 301, 331), temp = c(8.3, 10.3, 9.4, 6.1, 3, 1.3,
> + 1, 0.8, 1, 1.4, 2.7, 5.1, 9, 11.2, 9.6, 5.7, 2, 0.8, 0.6, 0.4,
> + 0.4, 0.6, 1.5, 4.5)), .Names = c("site", "day", "temp"), row.names = c(NA,
> + -24L), class = "data.frame")
> >
> > # split the data, copy value of first row to end
> > dat2 <- do.call(rbind, lapply(split(dat, dat$site), function(.site){
> +     x <- rbind(.site, .site[1L, ])  # add first row to bottom
> +     x$day[nrow(x)] <- 361
> +     x  # return x
> + }))
> > dat2
>       site day temp
> 1.1      1   1  8.3
> 1.2      1  31 10.3
> 1.3      1  61  9.4
> 1.4      1  91  6.1
> 1.5      1 121  3.0
> 1.6      1 151  1.3
> 1.7      1 181  1.0
> 1.8      1 211  0.8
> 1.9      1 241  1.0
> 1.10     1 271  1.4
> 1.11     1 301  2.7
> 1.12     1 331  5.1
> 1.13     1 361  8.3
> 2.13     2   1  9.0
> 2.14     2  31 11.2
> 2.15     2  61  9.6
> 2.16     2  91  5.7
> 2.17     2 121  2.0
> 2.18     2 151  0.8
> 2.19     2 181  0.6
> 2.20     2 211  0.4
> 2.21     2 241  0.4
> 2.22     2 271  0.6
> 2.23     2 301  1.5
> 2.24     2 331  4.5
> 2.131    2 361  9.0
>
> Jim Holtman
> Data Munger Guru
>
> What is the problem that you are trying to solve?
> Tell me what you want to do, not how you want to do it.
>
>
> On Mon, Oct 31, 2016 at 8:59 AM, Kristi Glover
> <kristi.glover at hotmail.com> wrote:
> > Hi R Users,
> >
> > I have a big table with many classes, I need to copy a fist row of each class
> and put at the end of each class.
> >
> > I split the table but I wonder of copying and putting at the end of the class.
> Here is an example. I was trying to get the table from "dat" to "dat1". In
> "dat", there is a column with "day", has only 12 rows for each class. but I want
> to copy first row of each class and put on the bottom of the class (see table:
> "dat1"), the value of the column of "day" need to be "361" but the value of
> temp should be same as of row 1.
> >
> >
> > Thanks for your suggestions in advance.
> >
> >
> > Thanks,
> >
> > dat<-structure(list(site = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2,
> > 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2), day = c(1, 31, 61, 91, 121,
> > 151, 181, 211, 241, 271, 301, 331, 1, 31, 61, 91, 121, 151, 181,
> > 211, 241, 271, 301, 331), temp = c(8.3, 10.3, 9.4, 6.1, 3, 1.3,
> > 1, 0.8, 1, 1.4, 2.7, 5.1, 9, 11.2, 9.6, 5.7, 2, 0.8, 0.6, 0.4,
> > 0.4, 0.6, 1.5, 4.5)), .Names = c("site", "day", "temp"), row.names = c(NA,
> > -24L), class = "data.frame")
> >
> > dat1<-structure(list(site = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
> > 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2), day = c(1, 31, 61, 91,
> > 121, 151, 181, 211, 241, 271, 301, 331, 361, 1, 31, 61, 91, 121,
> > 151, 181, 211, 241, 271, 301, 331, 361), temp = c(8.3, 10.3,
> > 9.4, 6.1, 3, 1.3, 1, 0.8, 1, 1.4, 2.7, 5.1, 8.3, 9, 11.2, 9.6,
> > 5.7, 2, 0.8, 0.6, 0.4, 0.4, 0.6, 1.5, 4.5, 9)), .Names = c("site",
> > "day", "temp"), row.names = c(NA, -26L), class = "data.frame")
> >
> >
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > 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.
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.

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