> > I want to be able to rotate a matrix 90 degrees, clockwise.
> > For > example,
> >> mat
> > [,1] [,2] [,3]
> > [,1] 1 2 1
> > [,2] 3 2 6
> > [,3] 4 5 3
> >
> > I want to rotate it, so that it looks like this...
> > [,1] [,2] [,3]
> > [,1] 4 3 1
> > [,2] 5 2 2
> > [,3] 3 6 1
> >
>
> mat
> # [,1] [,2] [,3]
> # [1,] 1 2 1
> # [2,] 3 2 6
> # [3,] 4 5 3
>
> matrix(rev(mat),nrow=3,byrow=TRUE)[(3:1),]
> # [,1] [,2] [,3]
> # [1,] 4 3 1
> # [2,] 5 2 2
> # [3,] 3 6 1
>
> How's that? (But straightforward? Straightbackward, more like).
One might also work it every bit as straight backward as follows:
z<-matrix(c(1,2,1,3,2,6,4,5,3), ncol=3, byrow=TRUE)
t(z[3:1,3:1])[3:1,]
--
Curt Seeliger, Data Ranger
Raytheon Information Services - Contractor to ORD
seeliger.c...@epa.gov
541/754-4638
[[alternative HTML version deleted]]
______________________________________________
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.
