[R] Order all the columns ascending elements on a matrix or a data frame

[Bert Gunter]

Inline ...

-- Bert

On Sun, Jun 10, 2012 at 10:46 AM, arun <smartpink111 at yahoo.com> wrote:
> Hi,
>
> If your intention is to order the first column by ascending, then by 2nd and so on..
> Try this.
>
>  set.seed(1)
>   dat1<-cbind(x=rnorm(10,5,0.5),y=runif(10,0.4),z=rnorm(10,15,0.2))
>  dat1
>              x         y        z
>  [1,] 4.686773 0.9608231 14.99101
>  [2,] 5.091822 0.5272855 14.99676
>  [3,] 4.582186 0.7910043 15.18877
>  [4,] 5.797640 0.4753331 15.16424
>  [5,] 5.164754 0.5603324 15.11878
>  [6,] 4.589766 0.6316685 15.18380
>  [7,] 5.243715 0.4080342 15.15643
>  [8,] 5.369162 0.6294328 15.01491
>  [9,] 5.287891 0.9218145 14.60213
> [10,] 4.847306 0.6042094 15.12397
>
>  dat1[order(dat1[,1],dat1[,2],dat1[,3]),]

## if dat1 is a data frame, e.g.

dat1 <- data.frame(dat1)

## This can be shortened to:

do.call(order,dat1)

?do.call

-- Bert

>              x         y        z
>  [1,] 4.582186 0.7910043 15.18877
>  [2,] 4.589766 0.6316685 15.18380
>  [3,] 4.686773 0.9608231 14.99101
>  [4,] 4.847306 0.6042094 15.12397
>  [5,] 5.091822 0.5272855 14.99676
>  [6,] 5.164754 0.5603324 15.11878
>  [7,] 5.243715 0.4080342 15.15643
>  [8,] 5.287891 0.9218145 14.60213
>  [9,] 5.369162 0.6294328 15.01491
> [10,] 5.797640 0.4753331 15.16424
>
>
>
> But, if it is like to order all the columns at once,
>
> apply(dat1,2,sort)
>
>              x         y        z
>  [1,] 4.582186 0.4080342 14.60213
>  [2,] 4.589766 0.4753331 14.99101
>  [3,] 4.686773 0.5272855 14.99676
>  [4,] 4.847306 0.5603324 15.01491
>  [5,] 5.091822 0.6042094 15.11878
>  [6,] 5.164754 0.6294328 15.12397
>  [7,] 5.243715 0.6316685 15.15643
>  [8,] 5.287891 0.7910043 15.16424
>  [9,] 5.369162 0.9218145 15.18380
> [10,] 5.797640 0.9608231 15.18877
>
> Here, the all columns are sorted to ascending, but only problem is that the corresponding elements in each of the rows in the original dataset has also changed.
>
>
> A.K.
>
>
>
>
> ----- Original Message -----
> From: Trying To learn again <tryingtolearnagain at gmail.com>
> To: r-help at r-project.org
> Cc:
> Sent: Sunday, June 10, 2012 2:36 AM
> Subject: [R] Order all the columns ascending elements on a matrix or a data frame
>
> Imagine I have a csv KT.csv
>
> I want to create a new dataframe o convert KT in a matrix and create a new
> matrix with each column of KT ordered by ascending order.
>
> I have tried to make this
>
> b<-read.csv("KT.csv")
>
>
> for(i in 1:ncol(b)){
>
> b[,i]<-sort(b[,i])
>
> }
>
> But it puts a message that the number of rows doesn´t correspond.
>
> Can someone give me a clue on how to order.
>
> Many Thaks.
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>
>
> ______________________________________________
> R-help at 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.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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