I like your sub there :) Not relevant to my interests but its pretty and understandable (even to a newb like me). What is relevant to my interests is the actual converting part.

for my $y ( 0 .. $#lt -1 ) { push @{ $lt$y }, $lt$_$y for $y+1 .. $#{ $lt-1 };

I have some difficulties of understanding it clearly. Can you comment on this by which logic the first for conditions are set ( 0 .. $#lt -1 ) also the combination $# I have not encountered something like this what does it mean?

In reply to Re^4: Convert matrix formats by naturalsciences
in thread Convert matrix formats by naturalsciences

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