How to use rad2rad

Masayoshi Fujimoto has asked for the wisdom of the Perl Monks concerning the following question:

Could you tell me very easy simple example how to use rad2rad function? Here is my perl programme. I got the following message:

Undefined subroutine &main::rad2rad called at sample.pl line 8.
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#!/usr/bin/perl
use Modern::Perl;
use autodie; 
use Math::Trig;
use Math::Trig ':pi';

my $radians;
my $radians_wrapped_by_2pi = rad2rad($radians);
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Comment on How to use rad2rad Select or Download Code

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Re: How to use rad2rad
by Athanasius (Archbishop) on Jan 26, 2013 at 15:40 UTC

Hello Masayoshi Fujimoto, and welcome to the Monastery!

The function rad2rad is not exported by the Math::Trig module, so to use it you need to put the full module name in front:

my $radians_wrapped_by_2pi = Math::Trig::rad2rad($radians);
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Update: Here is an example of rad2rad() in use:

use Modern::Perl;
use Math::Trig ':pi';

my $radians = 4.5 * pi;
my $radians_wrapped_by_2pi = Math::Trig::rad2rad($radians);

say 'rad2rad(', $radians, ') = ', $radians_wrapped_by_2pi;
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Output:

 1:49 >perl 502_SoPW.pl
rad2rad(14.1371669411541) = 1.5707963267949

 1:49 >
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Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,