Thanks, but I've got lots and lots of these calculations, and what I'd like to be able to do is scope-globally adjust the behaviour, rather than have to wrap every block in either an eval or a conditional.
On reflection, a function mydiv:
sub mydiv {
my ( $divided, $divisor ) = @_;
$divisor ? $divided / $divisor : undef;
}
my $growth = mydiv($fig_2, $fig_1);
Might have been easier, but Abigail-II's answer is another way of getting to it as well.
Thanks
Alex
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