From: William James <w_a_x_man@...>
Date: 2007-01-15T08:25:06+09:00
Subject: Re: Number Spiral (#109)


William James wrote:
> Simon Kr�ger wrote:
> > Dear Ruby Quiz,
> >
> > this isn't really a solution to the quiz 109 because it violates
> > some (if not all) of the rules. But as James noted there was a
> > code golf problem very similar to this quiz and here is my
> > solution to that.
> > (see http://codegolf.com/oblongular-number-spirals for detailed
> > description of the code golf problem)
> >
> > ----------------------------------------------------------------
> > s,f=1,proc{|x,y|y<1?[]:[[*s...s+=x]]+f[y-1,x].reverse.transpose}
> > puts f[w=gets(' ').to_i,gets.to_i].map{|i|['%3i']*w*' '%i}
> > ----------------------------------------------------------------
> >
> > It draws a number spiral, starting with '1' in the upper left
> > corner and the highest number in the middle, it also features
> > spirals that are not quadratic.
> >
> > Yes, you will get some score at the codegolf site if you repost
> > this solution there - but nowadays you will only get to Rank 9
> > with this solution and of course you will start to feel ill and
> > you won't be able to sleep for days and other nasty things might
> > happen if you do so.
> >
> > If someone can derive an even shorter solution from this i would
> > be very interested to see it (the best ruby solution today has 7
> > bytes less)
> >
> > cheers
> >
> > Simon
>
> I can't get this to work.
>
> E:\Ruby>ruby try.rb
> 4 4
> try.rb:2:in `%': too few arguments. (ArgumentError)
>         from try.rb:2
>         from try.rb:2:in `map'
>         from try.rb:2

irb(main):006:0> s=1; x=5; [*s...s+x]
=> [1, 2, 3, 4, 5]
irb(main):007:0> s=1; x=5; [*s...s+=x]
=> []
irb(main):009:0> s=1; x=5; s...s+=x
=> 6...6