my $i=0;
$_->[2] = $i++ for @multi_array;

[download]

works for me too now after resetting $i which masked it.

You are right, the present data set has two columns and the other one three. I should have mentioned that.

Thanks for helping out. The generalisation is useful to have.

In reply to Re^2: adding an index column to a csv data file by ng0177
in thread adding an index column to a multi-array derived from a csv data file by ng0177

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