I replaced: 
$result = matrixwise_map(\&f, $mats);
print dumpf($result), $/;

[download]
in the above code with: 
my @result = matrixwise_map(\&f, $mats);
print dumpf(@result), $/;

[download]
to give me the same answer as in the comments.

In reply to Small typo by perlmoth
in thread Two handy tools for nested arrays: mapat and transpose by tmoertel

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