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README.pod  view on Meta::CPAN

=cut

=head2 tei_thornthwaite

 my $tei = tei_thornthwaite($jan,$feb,$mar,$apr,$may,$jun,$jul,$aug,$sep,$oct,$nov,$dec);

Calculates and returns the temperature efficiency index (TEI, sometimes called the 
Thornthwaite heat index) based on a monthly average temperature climatology for a given 
location. Since the equation involves a summation of adjusted monthly temperatures, 12 
arguments are required, consisting of the average temperature for each calendar month of 
the year. An optional 13th argument can also be supplied to define a numeric value 
interpreted as missing data. If not supplied, the default missing value is NaN.

The missing value will be returned if any of the temperature values are missing, 
undef, or invalid (e.g., non-numeric).

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=head1 INSTALLATION

lib/Drought/PET/Thornthwaite.pm  view on Meta::CPAN

}

=head2 tei_thornthwaite

 my $tei = tei_thornthwaite($jan,$feb,$mar,$apr,$may,$jun,$jul,$aug,$sep,$oct,$nov,$dec);

Calculates and returns the temperature efficiency index (TEI, sometimes called the 
Thornthwaite heat index) based on a monthly average temperature climatology for a given 
location. Since the equation involves a summation of adjusted monthly temperatures, 12 
arguments are required, consisting of the average temperature for each calendar month of 
the year. An optional 13th argument can also be supplied to define a numeric value 
interpreted as missing data. If not supplied, the default missing value is NaN.

The missing value will be returned if any of the temperature values are missing, 
undef, or invalid (e.g., non-numeric).

=cut

sub tei_thornthwaite {
    # Define a NaN value for later use