Re: 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.

Comment on Re: Perl and Quaternions

Replies are listed 'Best First'.
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.	[reply]
Re^3: Perl and Quaternions by salva (Canon) on May 08, 2014 at 10:21 UTC
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.	[reply] [d/l] [select]