Use do.call(func, listOfArgs) when you don't
know how many arguments will be passed to func.
E.g.,
> x <- cbind(round(sin(1:10)), round(cos(1:10)), round(tan(1:10)))
> x[do.call("order", split(x, col(x))), , drop=FALSE]
[,1] [,2] [,3]
[1,] -1 -1 1
[2,] -1 -1 1
[3,] -1 0 -3
[4,] 0 -1 0
[5,] 0 -1 0
[6,] 0 1 0
[7,] 1 0 -7
[8,] 1 0 -2
[9,] 1 1 1
[10,] 1 1 2
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf Of Maxim
> Sent: Friday, September 23, 2011 9:22 AM
> To: r-help
> Subject: [R] sorting multiple columns of a matrix
>
> Hi,
>
>
> I have a question about how to sort a matrix for multiple columns.
>
>
> dat<-sample(0:1,1000,replace=T)
>
> matrix(dat,ncol=5,nrow=200)->x
>
>
> I want to order like the following:
>
>
> x[order(x[,1],x[,2],x[,3],x[,4],x[,5]),]->x
>
>
> My problem: the number of columns of the matrix to be sorted is variable, in
> any way I would like to sort for all columns from 1:ncol(x). How to achieve
> this?
>
>
> Best
>
>
> Maxim
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> 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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