Replace
arrayT ~= rowT;
with
arrayT ~= rowT.dup;

Also, you may want to look into ndslice package [1].
[1] https://github.com/libmir/mir-algorithm

Best regards,
Ilya Yaroshenko

Works! Thanks Ilya. I'll take a look on the difference. Also soon will get bit familiar with the mir-algorithm...

Best, Torsten

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