From: Patrick Hurley <phurley@...>
Date: 2006-09-07T07:24:47+09:00
Subject: Re: NArray shuffle

On 9/6/06, Daniel Martin <martin@snowplow.org> wrote:
> "Patrick Hurley" <phurley@gmail.com> writes:
>
> > Has anyone ever needed to "shuffle" an NArray? I can certainly convert
> > it to an array and do the sort_by {rand} idiom, and then convert it
> > back. I currently:
>
> What about:
>
> shuffled = orig[NArray.float(*orig.shape).random!.sort_index]
>
> --
> s=%q(  Daniel Martin -- martin@snowplow.org
>        puts "s=%q(#{s})",s.map{|i|i}[1]       )
>        puts "s=%q(#{s})",s.map{|i|i}[1]
>
>

Thanks Daniel, that is perfect -- I did not know you could index an NA
with an Array that way -- its perfect for my needs (plus it keeps the
type of the Array).

pth