Why not cycle through the top-level array, shifting off the bottom element in each sub-array? Something like 
@array = ([1,2,3],[4,5,6],[7,8,9]);
while (grep scalar @{ $_ }, @array) {
  for $i (@array) {
    print shift @{ $i };
    }
  }

[download]
This has the merit that not only do you not need to code (or even initialise, or know) the number and length of sub-arrays, but they can also be of different lengths.

§ George Sherston

In reply to Re: Re: Re: Fun with two-dimensional arrays by George_Sherston
in thread Fun with two-dimensional arrays by FoxtrotUniform

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