Given:  mx =. (i. 2 3) ;<i. 4 3 . Note that both boxed matrices have the same 
number of columns (3) but different numbers of rows.

Is it possible to unbox and stack them without generating fills (in this case 
into a 6 x 3 matrix)? I've tried various things (most obviously just > mx ) and 
I always seem to generate fills, which makes the first box into a 4 x 3 matrix 
also.

Thanks!

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Philip A Viton
City and Regional Planning
Ohio State University

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