On Sat, Mar 12, 2011 at 1:07 PM, Colin Law <clan...@googlemail.com> wrote:
> On 12 March 2011 20:47, Michael Pavling <pavl...@gmail.com> wrote:
> > On 12 March 2011 14:23, Colin Law <clan...@googlemail.com> wrote:
> >> On 12 March 2011 13:42, Rob Biedenharn <r...@agileconsultingllc.com>
> wrote:
> >>> def usually_one
> >>> rand < 0.80 ? 1 : 2
> >>> end
> >>
> >> Yes, much better. I suppose it is the old programmer in me
> >> instinctively avoiding floating point to save on processor time. A
> >> bit silly when everything has hardware floating point.
> >
> > Although I prefer Rob's suggestion as a better example of self
> > documented code; this is another alternative...
> >
> > def usually_one
> > [1,2,2,2,2][rand(5)]
> > end
> >
>
> Ha! Vindicated
>
> ruby-1.8.7-p302 > begin
> ruby-1.8.7-p302 > t=Time.now
> ruby-1.8.7-p302 ?> 1000000.times{(rand(100) + 120)/100}
> ruby-1.8.7-p302 ?> puts Time.now-t
> ruby-1.8.7-p302 ?> end
> 0.905431
>
> ruby-1.8.7-p302 > begin
> ruby-1.8.7-p302 > t=Time.now
> ruby-1.8.7-p302 ?> 1000000.times{rand < 0.80 ? 1 : 2}
> ruby-1.8.7-p302 ?> puts Time.now-t
> ruby-1.8.7-p302 ?> end
> 1.712769
>
> ruby-1.8.7-p302 > begin
> ruby-1.8.7-p302 > t=Time.now
> ruby-1.8.7-p302 ?> 1000000.times{ [1,2,2,2,2][rand(5)] }
> ruby-1.8.7-p302 ?> puts Time.now-t
> ruby-1.8.7-p302 ?> end
> 1.150481
>
Here's my number from within and outside IRB from Mac OS 10.6.6:
ruby-1.9.2-head :001 > begin
ruby-1.9.2-head :002 > t=Time.now
ruby-1.9.2-head :003?> 1000000.times{(rand(100) + 120)/100}
ruby-1.9.2-head :004?> puts Time.now-t
ruby-1.9.2-head :005?> end
from-irb: 0.16657 from-ruby-script: 0.159452
ruby-1.9.2-head :006 > begin
ruby-1.9.2-head :007 > t=Time.now
ruby-1.9.2-head :008?> 1000000.times{rand < 0.80 ? 1 : 2}
ruby-1.9.2-head :009?> puts Time.now-t
ruby-1.9.2-head :010?> end
from-irb: 0.280634 from-ruby-script: 0.150247
ruby-1.9.2-head :011 > begin
ruby-1.9.2-head :012 > t=Time.now
ruby-1.9.2-head :013?> 1000000.times{[1,2,2,2,2][rand(5)]}
ruby-1.9.2-head :014?> puts Time.now-t
ruby-1.9.2-head :015?> end
from-irb: 0.521992 from-ruby-script: 0.35944
-Conrad
>
> > ...there's many ways to skin a cat :-)
>
> But how fast can you do it?
>
> Colin
>
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