From: Robert Klemme <shortcutter@...>
Date: 2006-05-17T00:14:18+09:00
Subject: Re: In search of elegant indices searching

2006/5/16, Nuralanur@aol.com <Nuralanur@aol.com>:
> Dear all,
>
> I have a Hash, with equal-length Arrays as values, something like
>
> my_hash={'x',[1,1,3,1,5,6],'w',[1,2,3,1,4,5],'y',[1,1,1,4,4,6],'z',[0,1,1,2,3,
> 4]}  .
>
> Some of the values in the Arrays occur several times.
> Now, I am looking for an elegant way to extract, for  all the values
> of specified keys, all the indices
> where one or more variables do not change their values, i.e.,  something
> like
>
> class Hash
>     def fixed_vars(which_vars)
>
>          # some elegant code
>         return result
>     end
> end
>
> res=my_hash.fixed_vars(['x','w'])
>
> giving
>
> res={{'x'=>1,'w'=>1}=>[0,3],{'x'=>3,'w'=>3}=>[2],{'x'=>5,'w'=>4}=>[4],{'x'=>6,
> 'w'=>5}=>[5]}.

That's a really wired output.  Can you explain what that means? I have
a hard time detecting the pattern here.

robert