Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?

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.

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.

      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.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1085428]
[holli]: yes, that' s the one.
[holli]: *shudder* electronic music? i'm more for the opposite :)

How do I use this? | Other CB clients
Other Users?
Others cooling their heels in the Monastery: (9)
As of 2017-11-18 19:15 GMT
Find Nodes?
    Voting Booth?
    In order to be able to say "I know Perl", you must have:

    Results (277 votes). Check out past polls.