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atan2

Perl 5 version 8.9 documentation
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atan2

Perl functions A-Z | Perl functions by category | The 'perlfunc' manpage
  • atan2 Y,X

    Returns the arctangent of Y/X in the range -PI to PI.

    For the tangent operation, you may use the Math::Trig::tan function, or use the familiar relation:

    1.     sub tan { sin($_[0]) / cos($_[0])  }

    Note that atan2(0, 0) is not well-defined.