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1    6    11
2    7    12
3    8    13
4    9    14
5    10    15

1    6    11
2    7    
3    8    13
4        14
5    10    15

#!/usr/bin/env perl

...
}

exit;

[1 2 3 4 5]
[6 7 8 9 10]
[11 12 13 14 15]

[1 2 3 4 5]
[6 7 8 0 10]
[11 0 13 14 15]

perl -MPDL -E 'say $PDL::undefval'
0

#!/usr/bin/env perl

...
}

exit;

[1 2 3 4 5]
[6 7 8 9 10]
[11 12 13 14 15]

[1 2 3 4 5]
[6 7 8 0 10]
[11 -999 13 14 15]