Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »

Activity for Fred Wamsley‭

Type On... Excerpt Status Date
Edit Post #286472 Initial revision over 2 years ago
Question Are vectrices useful for calculations as opposed to formalism?
The context here is calculations about satellite attitude control and motion. There is a frequent need to convert between reference frames, and a vectrix is a clever notation to assist. The fundamental idea is to represent a frame of reference by a 3x1 matrix in which the elements are not scalars...
(more)
over 2 years ago
Edit Post #286166 Initial revision over 2 years ago
Question Complex numbers in 2D, quaternions in 4D, why nothing in 3D?
I'm just trying to understand why quaternions are necessary. If I understand right, first off please check me on this, Hamilton kept trying to find ways to multiply triplets and found something satisfactory only when he escalated to four dimensions. So game coders and spacecraft engineers extend ...
(more)
over 2 years ago
Comment Post #285984 As to why they're not commutative, think of them in terms of their application to describe rotation. Grab something from a set of dice, a cube with unique markers on each face. Make a note of which side is facing you, then rotate it around the x axis and then around the y axis. Make a note of the sid...
(more)
over 2 years ago