The index variable of a foreach loop is locally aliased to each of the elements of the list, in turn. That is not the same as being assigned to each value; instead, it's more like being a reference that is implicitly dereferenced. The index variable is just another name for whatever is in the list. The actual data you want to work with must be in the list. Like 
foreach my $i (@tstary[1,1,1]) { # or (($tstary[1])x3)
  ++$i;
  print join(':', @tstary), "\n";
}

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In reply to Re: Using non-scalar constructs in foreach loops by Roy Johnson
in thread Using non-scalar constructs in foreach loops by periapt

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