[R] c(1:n, 1:(n-1), 1:(n-2), ... , 1)

Frank Schwidom schwidom at gmx.net
Thu Sep 17 20:37:51 CEST 2015


sequence( 5:1)

Regards.

On Thu, Sep 17, 2015 at 11:19:05AM -0700, Dan D 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
> 
> 
> 
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