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```{index} single: PDL::Constants; Perl module
```

# PDL::Constants

```{pperl-module-badges} PDL::Constants
```

Mirrors `PDL::Constants.pm`: exports numeric constants as constant subs.

##  Synopsis

    use PDL::Constants qw(PI E);
    my $circle = 2 * PI * $r;
    my $growth = E ** $x;