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Well, in this particular set of data, $x maxes out at 500 and $y maxes out at 10,000. So yes, it's an indexing issue related to @{$aob[ $y - 1 ]} but nothing I've read points to a simple one-line solution that actually produces the proper output.

As is my usual, my current solution is a little sideways. In the section above calling popnum3:

foreach my $r (0 .. $total){ $row[$r] = $aob[$r][$y - 1]; } my @rowin = grep { $_ ne q{} } @row; $mean = mean(@rowin);
sub popnum3 { my ( $x, $y, $z, $mean ) = @_; $aob[$x][$y] = $mean * ( 1 + $z ); return $aob[$x][$y]; }

Supposedly @row = @{$aob[ $y - 1 ]} should be equivalent to

foreach my $r (0 .. $total){ $row[$r] = $aob[$r][$y - 1]; }
But it didn't work out that way.

BTW, the grep is in there since I know that although the current parameters shouldn't produce any blanks in the output, other parameters will.

In reply to Re^4: undefined value in array reference by Dandello
in thread undefined value in array reference by Dandello

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