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minimum($dataA->xchg(0,1));
maximum($dataB->xchg(0,1));

for(my $k=0; $k<$maxColumns; $k++) {
    print "Min: " . min($dataA->slice("$k,:")) . "\n\n";
    print "Max: " . max($dataB->slice("$k,:")) . "\n\n";    
}