Unfortunately not, $x is an array ref not a hash ref.

Ah, I see what you mean. If I had to work with a subset of a hash, I'd probably just work with that hash directly and only operate on a subset of the keys (various ways to do that)... arrays are a little different in that respect. Anyways, refaliasing works:

$ perl -wMstrict -Mexperimental=refaliasing -MData::Dump -le '
  my %h=("a".."f"); my %x; \$x{c}=\$h{c}; $x{c}="X"; dd \%h'
{ a => "b", c => "X", e => "f" }

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In reply to Re^6: Selecting Ranges of 2-Dimensional Data by haukex
in thread Selecting Ranges of 2-Dimensional Data by haukex

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