POV-Ray : Newsgroups : povray.general : Matrices : Re: Matrices Server Time
11 Aug 2024 05:14:53 EDT (-0400)
  Re: Matrices  
From: Lance Birch
Date: 3 Sep 1999 19:53:40
Message: <37d05f84@news.povray.org>
That's true hehe

I've spent the last 6 months doing matrix stuff in Mathematics C.  Gets
fairly boring when you're given a test and you have to work out the
determinant of 2 3x3 matrices and then use them with Cramer's Rule to work
out the solutions to simultaneous equations, all by hand.  Soo sloooooww...

--
Lance.


---
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Larry Fontaine wrote in message <37D05CAF.2317EEA8@isd.net>...
>Well it doesn't really matter because they're supposed to be 4x4 anyway and
>those are multiplyable. Yes, I know, non-commutative blah blah blah I
learned
>that stuff last year. That's fairly obvious, though, because everybody
whose
>ever made a POV scene knows that rotate-translate is different from
>translate-rotate.
>
>Lance Birch wrote:
>
>> >But Mr.POV, I can't multiply 4x3 matrices together!!!
>>
>> Some matrices are non-conformable, so you can't multiply a 4x3 matrix by
a
>> 4x3 matrice but you can multiply a 4x3 by a 3x4.
>>
>> For example:
>>
>> a = [1, 2, 3]
>> b = [3, 5, 7]
>>
>> You can multiply a by b because they're non-conformable matrices.
>> And also matrices are not commutative or associative under
multiplication.
>>
>> Or was that what you meant anyway?
>>
>> --
>> Lance.
>>
>> ---
>> For the latest 3D Studio MAX plug-ins, images and much more, go to:
>> The Zone - http://come.to/the.zone
>> For a totally different experience, visit my Chroma Key Website:
>> Colorblind - http://listen.to/colorblind
>


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