Hi
I have to correct myself, this last solution is not universally valid
here a better one:
tmp1 <- ( 1 - outer( max( x):1, x, FUN='-'))
tmp1[ tmp1 > 0]
On 2015-09-17 21:06:30, Frank Schwidom wrote:
>
> how abount a more complicated one?
>
> outer( 1:5, 1:5, '-')[ outer( 1:5, 1:5, '>')]
> [1] 1 2 3 4 1 2 3 1 2 1
>
>
> On Thu, Sep 17, 2015 at 11:52:27AM -0700, David Winsemius wrote:
> > You can add this to the list of options to be tested, although my bet would
> > be placed on `sequence(5:1)`:
> >
> > > Reduce( function(x,y){c( 1:y, x)}, 1:5)
> > [1] 1 2 3 4 5 1 2 3 4 1 2 3 1 2 1
> >
> >
> > On Sep 17, 2015, at 11:40 AM, Achim Zeileis wrote:
> >
> > > On Thu, 17 Sep 2015, Peter Langfelder wrote:
> > >
> > >> Not sure if this is slicker or easier to follow than your solution,
> > >> but it is shorter :)
> > >>
> > >> do.call(c, lapply(n:1, function(n1) 1:n1))
> > >
> > > Also not sure about efficiency but somewhat shorter...
> > > unlist(lapply(5:1, seq))
> > >
> > >> Peter
> > >>
> > >> On Thu, Sep 17, 2015 at 11:19 AM, Dan D <ddalth...@usgs.gov> wrote:
> > >>> Can anyone think of a slick way to create an array that looks like
> > >>> c(1:n,
> > >>> 1:(n-1), 1:(n-2), ... , 1)?
> > >>>
> > >>> The following works, but it's inefficient and a little hard to follow:
> > >>> n<-5
> > >>> junk<-array(1:n,dim=c(n,n))
> > >>> junk[((lower.tri(t(junk),diag=T)))[n:1,]]
> > >>>
> > >>> Any help would be greatly appreciated!
> > >>>
> > >>> -Dan
> > >>>
> > >>>
> >
> > David Winsemius
> > Alameda, CA, USA
> >
> > ______________________________________________
> > R-help@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@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@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.
