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### Re: Perl and Quaternions

by salva (Abbot)
 on May 08, 2014 at 08:03 UTC ( #1085428=note: print w/replies, xml ) Need Help??

in reply to Perl and Quaternions

Uff, that's not the usual quaternion!

The best way to do trigonometric operations with a computer is to convert between degrees and radians on the input/output layer and internally, on your program, use always radians.

Also, in order to manipulate 2D coordinates, using vector arithmetic would greatly simplify everything. For instance, check Math::Vector::Real.

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Re^2: Perl and Quaternions
by AppleFritter (Vicar) on May 08, 2014 at 09:50 UTC

Uff, that's not the usual quaternion!

Actually, it is; quaternions are often used to represent rotations.

Oh, ok, I got confused because of the X, Y names. 2D and 3D coordinates are promoted to quaternions as {0, x, y, z} and seeing {x, 0, 0, y} didn't feel right!

In any case, for 2D rotations, quaternions are overkill. You can just use complex numbers.

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