^ doesn't mean "to the power of" in Perl, it means "exclusively ored with". Change $temp^2 to $temp*$temp and $vol^2 to $vol*$vol.

Update: As other pointed out, Perl does have a power operator: ** (although it's not quite as fast, as you can see in Benchmarks I posted below).

In reply to Re: Convert arithmetic expression from Excel to Perl syntax by ikegami
in thread Convert arithmetic expression from Excel to Perl syntax by ameyer

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