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by gods (Initiate)
on Aug 24, 1999 at 22:43 UTC ( [id://333] : perlfunc . print w/replies, xml ) Need Help??


See the current Perl documentation for atan2.

Here is our local, out-dated (pre-5.6) version:

atan2 - arctangent of Y/X

atan2 Y,X

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

For the tangent operation, you may use the POSIX::tan() function, or use the familiar relation:

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