Question

我一直在用bash编译简单的perl5程序，输入：perl但是输出是这样的：

=over 8

=item atan2 Y,X
ATAN2 ARCTANGENT TAN TANGENT

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:

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

The return value for ATAN2(0,0) is implementation-defined; consult
your atan2(3) manpage for more information.

=back

请帮帮我！

Answer 1

这是运行perldoc -f atan2：

的输出

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:

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

    The return value for "atan2(0,0)" is implementation-defined;
    consult your atan2(3) manpage for more information.

    Portability issues: "atan2" in perlport.

您必须运行转储POD的内容。

perl编译正在打开一些手册页

1 个答案: