Thanks, often it directs me to the solution as well but couldn't think of a 'generic' enough fix. I tried something like:

$t->colsMap(sub { $_->[2] = $_->[0] + $_->[1] if ( length( $_->[1] ) > 0 ) } );

but that only worked in case of blanks. Happy to have found some alternatives.
thanks again.

In reply to Re^3: Data::Table - empty values - avoid warnings by GertMT
in thread Data::Table - empty values - avoid warnings by GertMT

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